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Loans and Allowance for Credit Losses Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 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 |  |
Net loans | 23,862,574,000 |  | $ 24,044,919,000
Borrowers with loan modifications, commitments to lend additional funds | 0 |  |
Net loans (charged off) recovered | (12,591,000) | $ (8,598,000) |
Without a Related Allowance | 68,154,000 |  | $ 105,173,000
Loans - Excluding OBS Credit Exposure |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net loans (charged off) recovered | $ (12,591,000) | $ (8,598,000) |

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- Definition Represents the minimum principal balance threshold for disclosing impaired loans primarily secured by real estate that were measured at estimated fair value using certified third party appraisals updated in the previous 12 months. + References No definition available. + Details
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