Annual report pursuant to Section 13 and 15(d)

Allowance for Loan and Lease Losses - Summary of Aging Analysis of Recorded Investment for Delinquent Loans by Portfolio and Segment (Details)

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Allowance for Loan and Lease Losses - Summary of Aging Analysis of Recorded Investment for Delinquent Loans by Portfolio and Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current $ 2,375,988 $ 1,755,867
Recorded investment, Non-accrual 8,597 6,459
Recorded investment, Total 2,388,532 1,767,182
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 3,622 3,759
Recorded investment, Non-accrual 930 308
Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 325 1,095
Recorded investment, Non-accrual 545 1,200
Financing Receivables, Past Due Greater Than 90 Days or More and Still Accruing    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due   2
Recorded investment, Non-accrual 2,200 2,600
Commercial and Industrial Loans    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 567,491 278,922
Recorded investment, Non-accrual 4,929 2,579
Recorded investment, Total 574,986 282,949
Commercial and Industrial Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 2,295 760
Commercial and Industrial Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 271 688
Real Estate | 1-4 Single Family Residential    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 362,505 372,828
Recorded investment, Non-accrual 1,507 1,897
Recorded investment, Total 364,139 375,743
Real Estate | 1-4 Single Family Residential | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 99 1,018
Real Estate | 1-4 Single Family Residential | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 28  
Real Estate | Construction, Land and Development    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 415,135 258,497
Recorded investment, Non-accrual 217 216
Recorded investment, Total 415,488 259,384
Real Estate | Construction, Land and Development | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 136 671
Real Estate | Commercial Real Estate (Including Multifamily)    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 953,823 750,432
Recorded investment, Non-accrual 1,836 1,693
Recorded investment, Total 956,743 753,812
Real Estate | Commercial Real Estate (Including Multifamily) | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 1,084 1,283
Real Estate | Commercial Real Estate (Including Multifamily) | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due   404
Consumer Loans and Leases    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 11,618 22,663
Recorded investment, Non-accrual 108 74
Recorded investment, Total 11,738 22,769
Consumer Loans and Leases | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 8 27
Consumer Loans and Leases | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 4 3
Consumer Loans and Leases | Financing Receivables, Past Due Greater Than 90 Days or More and Still Accruing    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due   2
Municipal and Other Loans    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 65,416 72,525
Recorded investment, Total 65,438 $ 72,525
Municipal and Other Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due $ 22