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Securities - Schedule of Debt Securities Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale [Abstract]    
Amortized Cost $ 1,454,266 $ 1,332,467
Gross unrealized gains 1,695 3,658
Gross unrealized losses 50,017 39,831
Securities AFS, at estimated fair value 1,405,944 1,296,294
HELD TO MATURITY    
Amortized cost 1,305,975 1,307,053
Gross unrealized gains 5,753 10,571
Gross unrealized losses 171,281 151,462
Estimated Fair Value 1,140,447 1,166,162
US Treasury Securities    
Available-for-sale [Abstract]    
Amortized Cost 172,732 139,706
Gross unrealized gains 14 19
Gross unrealized losses 0 0
Securities AFS, at estimated fair value 172,746 139,725
State and political subdivisions    
Available-for-sale [Abstract]    
Amortized Cost 499,234 603,913
Gross unrealized gains 59 362
Gross unrealized losses 42,912 35,530
Securities AFS, at estimated fair value 456,381 568,745
HELD TO MATURITY    
Amortized cost 1,040,476 1,039,440
Gross unrealized gains 5,520 10,070
Gross unrealized losses 146,750 126,233
Estimated Fair Value 899,246 923,277
Corporate bonds and other    
Available-for-sale [Abstract]    
Amortized Cost 14,607 14,569
Gross unrealized gains 25 31
Gross unrealized losses 1,069 507
Securities AFS, at estimated fair value 13,563 14,093
HELD TO MATURITY    
Amortized cost 147,061 146,712
Gross unrealized gains 226 488
Gross unrealized losses 13,452 15,738
Estimated Fair Value 133,835 131,462
Residential    
Available-for-sale [Abstract]    
Amortized Cost [1] 762,472 569,039
Gross unrealized gains [1] 1,563 3,202
Gross unrealized losses [1] 5,501 3,258
Securities AFS, at estimated fair value [1] 758,534 568,983
HELD TO MATURITY    
Amortized cost [1] 88,510 90,619
Gross unrealized gains [1] 7 13
Gross unrealized losses [1] 8,841 7,263
Estimated Fair Value [1] 79,676 83,369
Commercial    
Available-for-sale [Abstract]    
Amortized Cost [1] 5,221 5,240
Gross unrealized gains [1] 34 44
Gross unrealized losses [1] 535 536
Securities AFS, at estimated fair value [1] 4,720 4,748
HELD TO MATURITY    
Amortized cost [1] 29,928 30,282
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 2,238 2,228
Estimated Fair Value [1] $ 27,690 $ 28,054
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.