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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,511,471 $ 1,548,482
Gross Unrealized Gains 5,747 9,376
Gross Unrealized Losses 150,863 141,208
Fair Value 1,366,355 1,416,650
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 114,611 114,418
Gross Unrealized Gains 161 495
Gross Unrealized Losses 5,244 5,009
Fair Value 109,528 109,904
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 462,622 472,286
Gross Unrealized Gains 4,172 6,449
Gross Unrealized Losses 23,595 22,277
Fair Value 443,199 456,458
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 89,796 89,999
Gross Unrealized Gains 2 2
Gross Unrealized Losses 8,762 8,077
Fair Value 81,036 81,924
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 47,703 49,976
Gross Unrealized Gains 6 8
Gross Unrealized Losses 5,203 4,744
Fair Value 42,506 45,240
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 794,239 819,303
Gross Unrealized Gains 1,406 2,422
Gross Unrealized Losses 107,898 100,895
Fair Value 687,747 720,830
U.S. corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,500 2,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 161 206
Fair Value $ 2,339 $ 2,294