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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Valuation allowances and reserves, balance | $ 2,700 | $ 6,000
Commercial and industrial |  |
Valuation allowances and reserves, balance | 4,929,981 | 4,832,858
Commerical mortgage and construction |  |
Valuation allowances and reserves, balance | 1,867,830 | 1,972,505
Real estate - home equity |  |
Valuation allowances and reserves, balance | 1,992,700 | 1,890,258
Total commitments to extend credit |  |
Valuation allowances and reserves, balance | 8,790,511 | 8,695,621
Standby letters of credit |  |
Valuation allowances and reserves, balance | 264,440 | 260,829
Commercial letters of credit |  |
Valuation allowances and reserves, balance | 67,396 | 49,288
Letter of Credit |  |
Valuation allowances and reserves, balance | $ 331,836 | $ 310,117

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