Annual report pursuant to Section 13 and 15(d)

FHLB and Other Borrowings - Additional Information (Details)

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FHLB and Other Borrowings - Additional Information (Details)
1 Months Ended 12 Months Ended
Jul. 24, 2020
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2021
USD ($)
LineOfCredit
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Federal Home Loan Bank Advances [Line Items]          
Pledged loans, collateral for FHLB advances     $ 993,400,000 $ 927,300,000  
FHLB maximum borrowing capacity     841,900,000    
Maximum borrowing capacity     115,000,000.0    
Line of credit facility, drawn amount     $ 0 0  
Number of lines of credit | LineOfCredit     5    
Amount outstanding [1]     $ 2,322,101,000 2,388,532,000  
Subordinated notes, net of issuance costs     36,452,000 36,296,000  
Secured borrowings       3,986,000  
Loan Held for Investment and Long-term Borrowings          
Federal Home Loan Bank Advances [Line Items]          
Secured borrowings     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        
Subordinated notes, net of issuance costs     37,000,000.0 37,000,000.0  
Paycheck Protection Program Liquidity Facility          
Federal Home Loan Bank Advances [Line Items]          
Amount outstanding     $ 0 149,848,000  
Interest rate     0.35%    
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     $ 45,100,000 $ 65,000,000.0  
FHLB borrowings, average interest rate     2.44% 2.29%  
FHLB outstanding callable     $ 16,000,000 $ 16,000,000  
[1] Balance includes $(8.1) and $(8.2) million of deferred fees, cost, premium and discount as of December 31, 2021 and 2020, respectively.