Quarterly report pursuant to Section 13 or 15(d)

FHLB and Other Borrowings - Additional Information (Details)

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FHLB and Other Borrowings - Additional Information (Details)
1 Months Ended 3 Months Ended
Jul. 24, 2020
USD ($)
May 31, 2017
USD ($)
Mar. 31, 2021
USD ($)
LineOfCredit
Dec. 31, 2020
USD ($)
Federal Home Loan Bank Advances [Line Items]        
Pledged loans, collateral for FHLB advances     $ 971,500,000 $ 927,300,000
FHLB maximum borrowing capacity     668,800,000  
Amount outstanding [1]     2,430,594,000 2,388,532,000
Loan Held for Investment and Long-term Borrowings        
Federal Home Loan Bank Advances [Line Items]        
Secured borrowings     4,000,000.0 4,000,000.0
Subordinated Notes Due 2030        
Federal Home Loan Bank Advances [Line Items]        
Interest rate 6.00%      
Fixed floating rate of subordinated notes 6.00%      
Proceeds from issuance of subordinated debt $ 37,000,000      
Frequency of payment quarterly      
Amount outstanding     37,000,000.0  
Secured Debt        
Federal Home Loan Bank Advances [Line Items]        
Aggregate amount of maturities for secured borrowings, year one     0  
Aggregate amount of maturities for secured borrowings, year two     0  
Aggregate amount of maturities for secured borrowings, year three     0  
Aggregate amount of maturities for secured borrowings, year four     0  
Aggregate amount of maturities for secured borrowings, year five     0  
Paycheck Protection Program Liquidity Facility        
Federal Home Loan Bank Advances [Line Items]        
Amount outstanding     $ 100,100,000  
Interest rate     0.35%  
Unsecured Line Of Credit        
Federal Home Loan Bank Advances [Line Items]        
Maximum borrowing capacity     $ 105,000,000.0  
Line of credit facility, drawn amount     $ 0  
Number of lines of credit | LineOfCredit     5  
Third Party Lender | Unsecured Line Of Credit        
Federal Home Loan Bank Advances [Line Items]        
Maximum borrowing capacity   $ 20,000,000.0    
Line of credit facility, expiration date   May 12, 2022    
Line of credit facility, remaining borrowing capacity       50,000,000.0
Line of credit facility, drawn amount     $ 0 0
Third Party Lender | Unsecured Line Of Credit | London Interbank Offered Rate (LIBOR)        
Federal Home Loan Bank Advances [Line Items]        
Debt instrument basis spread on variable rate   4.00%    
Short-term Debt        
Federal Home Loan Bank Advances [Line Items]        
FHLB borrowings     0 $ 10,000,000
FHLB borrowings, average interest rate       0.70%
Long-term Debt        
Federal Home Loan Bank Advances [Line Items]        
FHLB borrowings     $ 60,900,000 $ 65,000,000.0
FHLB borrowings, average interest rate     2.29%  
FHLB outstanding callable     $ 16,000,000 $ 16,000,000
[1] Organic loans balance includes $(11.9) million and $(8.2) million of deferred fees, cost, premium and discount as of March 31, 2021 and December 31, 2020, respectively.