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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,548,482 $ 1,831,791
Gross Unrealized Gains 9,376 20
Gross Unrealized Losses 141,208 236,844
Fair Value 1,416,650 1,594,967
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 114,418 190,170
Gross Unrealized Gains 495 0
Gross Unrealized Losses 5,009 22,919
Fair Value 109,904 167,251
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 472,286 681,192
Gross Unrealized Gains 6,449 0
Gross Unrealized Losses 22,277 80,025
Fair Value 456,458 601,167
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 89,999 93,599
Gross Unrealized Gains 2 8
Gross Unrealized Losses 8,077 8,326
Fair Value 81,924 85,281
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 49,976 58,727
Gross Unrealized Gains 8 12
Gross Unrealized Losses 4,744 6,071
Fair Value 45,240 52,668
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 819,303 805,603
Gross Unrealized Gains 2,422 0
Gross Unrealized Losses 100,895 119,381
Fair Value 720,830 686,222
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 206 122
Fair Value $ 2,294 $ 2,378