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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Available-for-Sale    
Total $ 7,879,108,000 $ 7,384,033,000
Unrealized Gains 817,000 112,282,000
Unrealized Losses (861,164,000) (118,235,000)
Basis Adjustments 0 0
Basis adjustments (155,781,000) 3,986,000
Fair Value 6,862,980,000 7,382,066,000
Held-to-Maturity    
Allowance for securities held-to-maturity (150,000)  
Total held-to-maturity securities 3,096,567,000 0
Unrealized Gains 0  
Unrealized Losses (496,127,000)  
Basis adjustments 0  
Fair Value 2,600,440,000 0
U.S. Treasury    
Available-for-Sale    
Total 246,987,000 234,555,000
Unrealized Gains 0 1,233,000
Unrealized Losses (7,010,000) (7,751,000)
Basis adjustments (46,372,000) 7,547,000
Fair Value 193,605,000 235,584,000
U.S. government-sponsored entities and agencies    
Available-for-Sale    
Total 1,453,829,000 1,575,994,000
Unrealized Gains 0 7,354,000
Unrealized Losses (168,963,000) (37,014,000)
Basis adjustments (109,409,000) (3,561,000)
Fair Value 1,175,457,000 1,542,773,000
Held-to-Maturity    
Amortized Cost 817,489,000  
Unrealized Gains 0  
Unrealized Losses (159,054,000)  
Basis adjustments 0  
Fair Value 658,435,000  
Mortgage-backed securities    
Available-for-Sale    
Total 5,074,503,000 3,737,484,000
Unrealized Gains 56,000 27,421,000
Unrealized Losses (615,032,000) (66,074,000)
Basis adjustments 0 0
Fair Value 4,459,527,000 3,698,831,000
Held-to-Maturity    
Amortized Cost 1,124,714,000  
Unrealized Gains 0  
Unrealized Losses (123,568,000)  
Basis adjustments 0  
Fair Value 1,001,146,000  
States and political subdivisions    
Available-for-Sale    
Total 713,669,000 1,587,172,000
Unrealized Gains 666,000 69,696,000
Unrealized Losses (39,288,000) (1,882,000)
Basis adjustments 0 0
Fair Value 675,047,000 1,654,986,000
Held-to-Maturity    
Amortized Cost 1,154,514,000  
Unrealized Gains 0  
Unrealized Losses (213,505,000)  
Basis adjustments 0  
Fair Value 941,009,000  
Pooled trust preferred securities    
Available-for-Sale    
Total 13,776,000 13,756,000
Unrealized Gains 0 0
Unrealized Losses (2,454,000) (4,260,000)
Basis adjustments 0 0
Fair Value 11,322,000 9,496,000
Other securities    
Available-for-Sale    
Total 376,344,000 235,072,000
Unrealized Gains 95,000 6,578,000
Unrealized Losses (28,417,000) (1,254,000)
Basis adjustments 0 0
Fair Value $ 348,022,000 $ 240,396,000