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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) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 368,901 $ 2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (36,260) (256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,037,068 477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (443,765) (89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,405,969 2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (480,025) (346,047)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 504,922
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (38,304)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,019,844 620,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (259,889) (157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,019,844 1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (259,889) (196,207)
US Government Debt Securities    
Schedule of Investments [Line Items]    
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 222,446 121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,798) (4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position 222,446 218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,798) (7,655)
US Government Agencies Debt Securities    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 987 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (54) (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 987 1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (54) (42)
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 138,638 995,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (13,674) (157,397)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 807,811 61,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (240,912) (21,419)
Debt Securities, Available-for-sale, Unrealized Loss Position 946,449 1,056,211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (254,586) (178,816)
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 118,791 376,398
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10,241) (31,333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 300,480 37,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (41,536) (6,150)
Debt Securities, Available-for-sale, Unrealized Loss Position 419,271 413,555
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (51,777) (37,483)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 10,292 113,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,397) (7,650)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 101,925 20,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (14,231) (5,472)
Debt Securities, Available-for-sale, Unrealized Loss Position 112,217 134,033
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (15,628) (13,122)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 32,935 154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4,272) (18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 155,351 55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (34,889) (11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position 188,286 210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (39,161) (29,847)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 246,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (14,275)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 344,810 153,178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (73,552) (43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 344,810 399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (73,552) (57,480)
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 67,258 371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6,622) (38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 449,055 181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (109,399) (40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position 516,313 552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (116,021) (79,082)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 258,255
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (24,029)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 675,034 466,949
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (186,337) (114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 675,034 725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (186,337) $ (138,727)