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Securities - Schedule of Debt Securities Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale [Abstract]    
Amortized Cost $ 1,816,349 $ 2,655,594
Gross unrealized gains 4,761 113,681
Gross unrealized losses 87,756 4,950
Securities available for sale, at estimated fair value 1,733,354 2,764,325
HELD TO MATURITY    
Amortized cost 1,083,672 90,780
Gross unrealized gains 237 4,455
Gross unrealized losses 114,102 0
Estimated Fair Value 969,807 95,235
US Treasury Securities    
Available-for-sale [Abstract]    
Amortized Cost 39,465 58,084
Gross unrealized gains 198 843
Gross unrealized losses 0 50
Securities available for sale, at estimated fair value 39,663 58,877
State and political subdivisions    
Available-for-sale [Abstract]    
Amortized Cost 1,255,380 1,962,257
Gross unrealized gains 1,099 93,893
Gross unrealized losses 80,248 4,214
Securities available for sale, at estimated fair value 1,176,231 2,051,936
HELD TO MATURITY    
Amortized cost 876,065 788
Gross unrealized gains 70 3
Gross unrealized losses 108,210 0
Estimated Fair Value 767,925 791
Corporate bonds and other    
Available-for-sale [Abstract]    
Amortized Cost 60,215 133,333
Gross unrealized gains 65 2,408
Gross unrealized losses 1,462 209
Securities available for sale, at estimated fair value 58,818 135,532
HELD TO MATURITY    
Amortized cost 95,362  
Gross unrealized gains 112  
Gross unrealized losses 2,435  
Estimated Fair Value 93,039  
Residential    
Available-for-sale [Abstract]    
Amortized Cost [1] 451,457 411,727
Gross unrealized gains [1] 3,399 14,895
Gross unrealized losses [1] 5,344 272
Securities available for sale, at estimated fair value [1] 449,512 426,350
HELD TO MATURITY    
Amortized cost [1] 65,494 38,644
Gross unrealized gains [1] 55 2,103
Gross unrealized losses [1] 2,273 0
Estimated Fair Value [1] 63,276 40,747
Commercial    
Available-for-sale [Abstract]    
Amortized Cost [1] 9,832 90,193
Gross unrealized gains [1] 0 1,642
Gross unrealized losses [1] 702 205
Securities available for sale, at estimated fair value [1] 9,130 91,630
HELD TO MATURITY    
Amortized cost [1] 46,751 51,348
Gross unrealized gains [1] 0 2,349
Gross unrealized losses [1] 1,184 0
Estimated Fair Value [1] $ 45,567 $ 53,697
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.