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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

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