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Securities- Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,216,850 $ 1,021,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 22,236 14,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,450,591 2,243,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 173,491 243,875
Total investments with an unrealized loss, fair value 3,667,441 3,265,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 195,727 258,224
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 626,281 693,621
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7,625 11,651
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 796,446 192,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 17,349 2,929
Total investments with an unrealized loss, fair value 1,422,727 886,121
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 24,974 14,580
U.S. Government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 14,989
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 219,712 247,648
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18,132 21,866
Total investments with an unrealized loss, fair value 219,712 262,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 18,132 21,877
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 391,774 72,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,313 1,518
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 617,752 828,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 82,606 123,499
Total investments with an unrealized loss, fair value 1,009,526 901,158
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 85,919 125,017
State and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 144,268 185,108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10,194 908
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 534,808 449,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 32,037 44,200
Total investments with an unrealized loss, fair value 679,076 634,320
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 42,231 45,108
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 20,457 42,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 29 254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,455 122,469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 45 10,026
Total investments with an unrealized loss, fair value 21,912 164,676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 74 10,280
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 34,070 12,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,075 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 280,418 403,882
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 23,322 41,355
Total investments with an unrealized loss, fair value 314,488 416,561
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 24,397 $ 41,362