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Loans and Allowance for Credit Losses Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Minimum balance of loans evaluated individually for impairment |  |  | $ 1,000,000.0 | $ 1,000,000.0 |  |
Impaired loans with principal balances approximately in percentage | 97.00% |  | 90.00% |  |  |
Impaired loans balances, real estate as collateral | $ 1,000,000.0 |  |  | 1,000,000.0 |  |
Net loans | 24,041,489,000 |  |  | 24,041,489,000 |  | $ 24,044,919,000
Borrowers with loan modifications, commitments to lend additional funds | 0 |  |  | 0 |  |
Net loans (charged off) recovered | (10,929,000) | $ (11,122,000) |  | (35,233,000) | $ (31,022,000) |
Without a Related Allowance | 66,258,000 |  |  | 66,258,000 |  | $ 105,173,000
Loans - Excluding OBS Credit Exposure |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net loans (charged off) recovered | $ (10,929,000) | $ (11,122,000) |  | $ (35,233,000) | $ (31,022,000) |

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