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Securities Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,021,511 $ 1,456,921
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 14,349 77,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,243,962 1,550,911
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 243,875 248,005
Debt Securities, Available-for-sale, Unrealized Loss Position 3,265,473 3,007,832
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 258,224 325,426
US Treasury Securities    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 693,621 192,188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 11,651 1,963
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 192,500 1,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,929 4
Debt Securities, Available-for-sale, Unrealized Loss Position 886,121 194,185
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 14,580 1,967
U.S. Government Agency Securities    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 14,989 46,062
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 11 2,224
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 247,648 350,094
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 21,866 34,094
Debt Securities, Available-for-sale, Unrealized Loss Position 262,637 396,156
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 21,877 36,318
Mortgage-backed Agency Securities    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 72,907 390,014
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,518 34,106
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 828,251 570,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 123,499 109,477
Debt Securities, Available-for-sale, Unrealized Loss Position 901,158 960,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 125,017 143,583
State and Municipal Securities    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 185,108 568,691
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 908 18,863
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 449,212 304,451
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 44,200 59,694
Debt Securities, Available-for-sale, Unrealized Loss Position 634,320 873,142
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45,108 78,557
Asset-backed Securities    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 42,207 513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 254 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 122,469 116,442
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 10,026 16,978
Debt Securities, Available-for-sale, Unrealized Loss Position 164,676 116,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 10,280 16,983
Corporate Notes    
Investment securities, continuous unrealized loss position [Abstract]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12,679 259,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 20,260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 403,882 207,326
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 41,355 27,758
Debt Securities, Available-for-sale, Unrealized Loss Position 416,561 466,779
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 41,362 $ 48,018