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Securities - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value $ 1,255,438 $ 311,552
More than 12 Months, fair value 8,281 17,450
Total fair value 1,263,719 329,002
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 64,209 3,891
More than 12 Months, unrealized Loss 1,137 1,059
Total unrealized loss 65,346 4,950
Securities available for sale, at estimated fair value 2,065,984 2,764,325
Securities available for sale, amortized cost 2,117,597 2,655,594
Gross unrealized gains 13,733 113,681
Gross unrealized losses 65,346 4,950
US Treasury Securities    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value   9,947
More than 12 Months, fair value   0
Total fair value   9,947
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss   50
More than 12 Months, unrealized Loss   0
Total unrealized loss   50
Securities available for sale, at estimated fair value   58,877
Securities available for sale, amortized cost   58,084
Gross unrealized gains   843
Gross unrealized losses   50
State and political subdivisions    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 1,030,604 260,509
More than 12 Months, fair value 0 7,608
Total fair value 1,030,604 268,117
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 12,767  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 240,844  
More than 12 months, unrealized loss 191  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 17,255  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12,576  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 223,589  
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 58,873 3,622
More than 12 Months, unrealized Loss 0 592
Total unrealized loss 58,873 4,214
Securities available for sale, at estimated fair value 1,566,185 2,051,936
Securities available for sale, amortized cost 1,614,421 1,962,257
Gross unrealized gains 10,637 93,893
Gross unrealized losses 58,873 4,214
Corporate bonds and other    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 108,153 35,597
More than 12 Months, fair value 0 0
Total fair value 108,153 35,597
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 3,191 209
More than 12 Months, unrealized Loss 0 0
Total unrealized loss 3,191 209
Securities available for sale, at estimated fair value 141,326 135,532
Securities available for sale, amortized cost 144,264 133,333
Gross unrealized gains 253 2,408
Gross unrealized losses 3,191 209
Residential    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 106,742 1,225
More than 12 Months, fair value 4,572 5,168
Total fair value 111,314 6,393
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 64  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 3,617  
More than 12 months, unrealized loss 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 64  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,617  
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 2,113 3
More than 12 Months, unrealized Loss 581 269
Total unrealized loss 2,694 272
Securities available for sale, at estimated fair value [1] 280,691 426,350
Securities available for sale, amortized cost [1] 280,804 411,727
Gross unrealized gains [1] 2,581 14,895
Gross unrealized losses [1] 2,694 272
Commercial    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 9,939 4,274
More than 12 Months, fair value 3,709 4,674
Total fair value 13,648 8,948
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 260  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 22,857  
More than 12 months, unrealized loss 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 260  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 22,857  
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 32 7
More than 12 Months, unrealized Loss 556 198
Total unrealized loss 588 205
Securities available for sale, at estimated fair value [1] 77,782 91,630
Securities available for sale, amortized cost [1] 78,108 90,193
Gross unrealized gains [1] 262 1,642
Gross unrealized losses [1] $ 588 $ 205
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.