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Loans and Allowance for Credit Losses - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
loan
Mar. 31, 2023
USD ($)
loan
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 17,001,760,000   $ 16,845,670,000
Deferred origination fees, net 3,900,000   6,700,000
Financing receivable, accrued interest excluded from amortized costs 79,800,000   77,100,000
Nonaccrual loans with no allowance for credit loss $ 4,800,000   3,200,000
Number of loan modifications granted | loan 0 0  
Number of loan modifications | loan 1    
Loan modified and subsequently defaulted $ 23,000    
Number of loan modifications with payment default | loan   0  
Foreclosed assets and other real estate owned 3,511,000   4,073,000
Financing receivable, collateral dependent, amount $ 147,961,000   144,604,000
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 $ 3,300,000   2,500,000
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 230,000   506,000
Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 13,464,526,000   13,338,186,000
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unfunded commitments, allowance for credit loss 25,600,000   25,600,000
Reserve for unfunded commitments, expensed (released) 0 $ 0  
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,725,953,000   2,722,886,000
Paycheck Protection Program Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 4,200,000   4,800,000
Other commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 7,508,049,000   7,552,410,000
Financing receivable, collateral dependent, amount $ 108,438,000   $ 76,229,000