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Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
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 0  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 108,251  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 1,910,140  
Amortized Cost 2,018,391 $ 2,122,680
Due within one year 0  
Due after one year through five years 30,946  
Due after five years through ten years 0  
Due after ten years 208,836  
Total 239,782  
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 0  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 104,556  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 1,728,526  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 1,833,082 $ 1,823,243
Due within one year 0  
Due after one year through five years 30,845  
Due after five years through ten years 0  
Due after ten years 196,179  
Total $ 227,024