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Loans and Allowance for Credit Losses - Textual (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 12,028,593,000   $ 12,012,503,000
Non-credit related discount 16,700,000   21,500,000
Financing receivable, accrued interest excluded from amortized costs 38,400,000   39,800,000
Nonaccrual loans with no allowance for credit loss 9,300,000   14,500,000
Foreclosed assets and other real estate owned 5,118,000   6,032,000
Financing receivable, collateral dependent, amount 99,997,000   47,089,000
Unfunded commitments, allowance for credit loss 22,400,000   22,400,000
Off-balance sheet, credit loss, liability, credit loss expense (reversal) $ 0    
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, term of loan 1 year    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, term of loan 3 years    
Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans in process of foreclosure, amount $ 1,143,000   1,806,000
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Foreclosed assets and other real estate owned 647,000   831,000
Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 9,228,990,000   9,167,250,000
Real Estate | OREO Received in Full or Partial Satisfaction of Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance prior to TDR 0 $ 0  
Single family residential | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,042,978,000   2,101,975,000
Financing receivable, collateral dependent, amount $ 1,947,000   1,838,000
Commercial real estate | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans with subsequent default | loan 0 0  
Other commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 5,762,567,000   5,738,904,000
Financing receivable, collateral dependent, amount 87,804,000   32,849,000
Paycheck Protection Program Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 61,900,000   $ 116,700,000