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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,367,123 $ 1,548,482
Gross Unrealized Gains 3,835 9,376
Gross Unrealized Losses 139,426 141,208
Fair Value 1,231,532 1,416,650
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75,141 114,418
Gross Unrealized Gains 140 495
Gross Unrealized Losses 3,784 5,009
Fair Value 71,497 109,904
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 398,648 472,286
Gross Unrealized Gains 2,008 6,449
Gross Unrealized Losses 20,376 22,277
Fair Value 380,280 456,458
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 86,328 89,999
Gross Unrealized Gains 4 2
Gross Unrealized Losses 8,638 8,077
Fair Value 77,694 81,924
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 68,130 49,976
Gross Unrealized Gains 3 8
Gross Unrealized Losses 4,879 4,744
Fair Value 63,254 45,240
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 736,376 819,303
Gross Unrealized Gains 1,680 2,422
Gross Unrealized Losses 101,696 100,895
Fair Value 636,360 720,830
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 53 206
Fair Value $ 2,447 $ 2,294