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Loans - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment at fair value $ 0 $ 17,011,000  
Loans held for investment 5,231,331,000 5,707,762,000  
Net deferred loan fees 9,600,000 13,700,000  
Accrued interest 15,900,000 20,300,000  
Increase (decrease) in reserve (25,100,000)    
Decrease in reserves due to qualitative factor changes across risk pools 19,600,000    
Provision expense   39,800,000  
Provision expense as a result of COVID-19   27,500,000  
Provision expense as a result of COVID-19 due to effects of individually evaluated loans   $ 8,100,000  
Number of significant loan write-offs | loan   4  
Charge-off as a result of COVID-19   $ 6,600,000  
Nonaccrual mortgage loans held for sale recorded at fair value $ 1,800,000 $ 681,000  
Number of loans that defaulted | loan 1 0 2
Nonperforming Financial Instruments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross interest income that would have been recorded $ 1,900,000 $ 1,500,000 $ 1,500,000
Interest income 0 0 0
Outstanding principal balance 9,000   $ 117,000
Paycheck Protection Program      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment 105,800,000 546,500,000  
Net deferred loan fees 3,000,000 9,600,000  
Debt instrument forgiveness 648,400,000    
Real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment 3,133,334,000 2,787,908,000  
Real estate | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment at fair value 0 17,000,000  
Loans held for investment 1,693,512,000 1,370,928,000  
Commercial Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment $ 1,454,235,000 $ 1,817,862,000