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Securities- Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 652,209 $ 1,456,921
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9,858 77,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,072,985 1,550,911
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 278,334 248,005
Total investments with an unrealized loss, fair value 2,725,194 3,007,832
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 288,192 325,426
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 26,629 192,188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 131 1,963
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 175,219 1,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 945 4
Total investments with an unrealized loss, fair value 201,848 194,185
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 1,076 1,967
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 26,524 46,062
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 225 2,224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 255,530 350,094
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 25,159 34,094
Total investments with an unrealized loss, fair value 282,054 396,156
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 25,384 36,318
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 73,079 390,014
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,031 34,106
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 849,254 570,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 136,568 109,477
Total investments with an unrealized loss, fair value 922,333 960,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 138,599 143,583
State and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 422,950 568,691
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5,014 18,863
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 301,326 304,451
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 53,812 59,694
Total investments with an unrealized loss, fair value 724,276 873,142
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 58,826 78,557
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 44,924 513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,013 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 116,573 116,442
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14,755 16,978
Total investments with an unrealized loss, fair value 161,497 116,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 15,768 16,983
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 58,103 259,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,444 20,260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 375,083 207,326
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 47,095 27,758
Total investments with an unrealized loss, fair value 433,186 466,779
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 48,539 $ 48,018