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Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]    
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One $ 0  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 141,306  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 130,997  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 1,850,377  
Amortized Cost 2,122,680 $ 2,429,808
Due within one year 0  
Due after one year through five years 23,785  
Due after five years through ten years 8,815  
Due after ten years 219,785  
Total 252,385  
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]    
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 0  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 134,899  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 123,088  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 1,565,256  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 1,823,243 $ 2,145,059
Due within one year 0  
Due after one year through five years 23,288  
Due after five years through ten years 8,348  
Due after ten years 199,488  
Total $ 231,124