Quarterly report pursuant to Section 13 or 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
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current $ 875,754 $ 864,022
Recorded investment, Non-accrual 3,866 3,562
Recorded investment, Total 882,101 869,119
Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 2,061 1,452
Recorded investment, Non-accrual 267 209
Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 420 50
Recorded investment, Non-accrual 213 57
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   33
Recorded investment, Non-accrual 288 427
Commercial and Industrial Loans    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 135,102 132,775
Recorded investment, Non-accrual 2,023 1,927
Recorded investment, Total 137,400 135,040
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 175 302
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 100 3
Commercial and Industrial Loans | 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   33
Real Estate | 1-4 Single Family Residential Loans    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 236,611 230,738
Recorded investment, Non-accrual 1,305 1,135
Recorded investment, Total 238,382 232,510
Real Estate | 1-4 Single Family Residential Loans | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 451 637
Real Estate | 1-4 Single Family Residential Loans | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 15  
Real Estate | Construction, Land and Development    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 142,048 139,470
Recorded investment, Total 143,646 139,470
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 1,293  
Real Estate | Construction, Land and Development | Financing Receivables, 60 to 89 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due 305  
Real Estate | Commercial Real Estate Loans (Including Multifamily)    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 289,138 284,869
Recorded investment, Non-accrual 433 447
Recorded investment, Total 289,571 285,731
Real Estate | Commercial Real Estate Loans (Including Multifamily) | Financing Receivables, 30 to 59 Days Past Due    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Past due   415
Consumer Loans and Leases    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 20,577 22,538
Recorded investment, Non-accrual 105 53
Recorded investment, Total 20,824 22,736
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 142 98
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   47
Municipal and Other Loans    
Financing Receivable Recorded Investment Past Due [Line Items]    
Recorded investment, Accruing, Current 52,278 53,632
Recorded investment, Total $ 52,278 $ 53,632