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Loans and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) loan | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 17,188,817,000 |  | $ 17,188,817,000 |  | $ 17,005,937,000 |
Loan premiums and discounts |  |  | 4,100,000 |  | 7,200,000 |
Deferred origination costs and fees | 8,100,000 |  | 8,100,000 |  | 9,600,000 |
Financing receivable, accrued interest excluded from amortized costs | 81,100,000 |  | 81,100,000 |  | 78,800,000 |
Nonaccrual loans with no allowance for credit loss | 6,800,000 |  | 6,800,000 |  | 1,700,000 |
Financing receivable, collateral dependent, amount | 108,416,000 |  | 108,416,000 |  | 102,580,000 |
Provision for credit loss expense | 15,180,000 | $ 12,148,000 | 53,922,000 | $ 33,453,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unfunded commitments, allowance for credit loss | 25,600,000 |  | 25,600,000 |  | 25,600,000 |
Reserve for unfunded commitments, expensed (released) | 0 | 0 | 0 | 0 |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans in process of foreclosure, amount | 3,400,000 |  | $ 3,400,000 |  | 4,000,000 |
Commercial Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans experiencing financial difficulty, modified, subsequent default | loan |  |  | 1 |  |  | 1
Loan modified and subsequently defaulted |  |  | $ 26,700,000 |  |  | $ 23,000
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 | 4,200,000 |  | 4,200,000 |  | 1,300,000 |
Loans, Excluding Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Provision for credit loss expense | 15,180,000 | $ 12,148,000 | 53,922,000 | $ 33,453,000 |  |
Loans, Excluding Acquired Loans | Nonperforming |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Provision for credit loss expense |  |  | $ 15,600,000 |  |  |
Number of credit relationships migrated to nonperforming | loan |  |  | 2 |  |  |
Paycheck Protection Program Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 370,000 |  | $ 370,000 |  | $ 1,600,000 |
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 |  |  |

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