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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
position
Dec. 31, 2022
USD ($)
position
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 146,416 $ 2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,240) (256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,145,336 477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (298,236) (89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,291,752 2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (301,476) $ (346,047)
Debt securities, available for sale, number of positions | position 727 782,000,000
Held to Maturity    
Estimated Fair Value, Less Than 12 Months $ 0 $ 504,922
Unrealized Losses, Less Than 12 Months 0 (38,304)
Estimated Fair Value, 12 Months or Longer 1,072,207 620,127
Unrealized Losses, 12 Months or Longer (195,715) (157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,072,207 1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (195,715) $ (196,207)
Debt securities, held-to-maturity, number of positions | position 180 180,000,000
U.S. Government securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 96,906
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (2,814)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 42,161 121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (314) (4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position 42,161 218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (314) (7,655)
US Government Agencies Debt Securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,010 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (28) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 1,010 1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (28) (42)
State and municipal securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 76,155 995,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (858) (157,397)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 917,274 61,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (128,789) (21,419)
Debt Securities, Available-for-sale, Unrealized Loss Position 993,429 1,056,211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (129,647) (178,816)
Corporate debt securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 42,945 376,398
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,326) (31,333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 370,523 37,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (39,310) (6,150)
Debt Securities, Available-for-sale, Unrealized Loss Position 413,468 413,555
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (40,636) (37,483)
Collateralized mortgage obligations    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 113,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (7,650)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 111,434 20,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (11,390) (5,472)
Debt Securities, Available-for-sale, Unrealized Loss Position 111,434 134,033
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (11,390) (13,122)
Residential mortgage-backed securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 409 154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3) (18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 195,453 55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (26,482) (11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position 195,862 210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (26,485) (29,847)
Held to Maturity    
Estimated Fair Value, Less Than 12 Months 0 246,667
Unrealized Losses, Less Than 12 Months 0 (14,275)
Estimated Fair Value, 12 Months or Longer 355,270 153,178
Unrealized Losses, 12 Months or Longer (51,805) (43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 355,270 399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (51,805) (57,480)
Commercial mortgage-backed securities    
Available for Sale    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 26,907 371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,053) (38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 507,481 181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (91,923) (40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position 534,388 552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (92,976) (79,082)
Held to Maturity    
Estimated Fair Value, Less Than 12 Months 0 258,255
Unrealized Losses, Less Than 12 Months 0 (24,029)
Estimated Fair Value, 12 Months or Longer 716,937 466,949
Unrealized Losses, 12 Months or Longer (143,910) (114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 716,937 725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (143,910) $ (138,727)