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Securities- Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,600,164 $ 2,724,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 49,426 28,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,288,388 1,619,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 241,193 193,330
Total investments with an unrealized loss, fair value 4,888,552 4,343,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 290,619 221,614
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,140,093 1,123,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 25,543 12,223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 181,729 177,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,701 2,054
Total investments with an unrealized loss, fair value 1,321,822 1,301,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 30,244 14,277
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 2,268 2,347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 198,678 210,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16,865 24,554
Total investments with an unrealized loss, fair value 200,946 212,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 16,867 24,572
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 889,446 990,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6,282 9,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 761,324 607,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 83,231 98,356
Total investments with an unrealized loss, fair value 1,650,770 1,598,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 89,513 107,567
State and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 550,783 446,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 17,562 5,590
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 971,718 348,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 123,966 41,145
Total investments with an unrealized loss, fair value 1,522,501 795,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 141,528 46,735
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 30,369
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 27
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
Total investments with an unrealized loss, fair value 0 30,369
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 0 27
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 17,574 131,073
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 37 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 174,939 274,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12,430 27,221
Total investments with an unrealized loss, fair value 192,513 405,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 12,467 $ 28,436