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Securities- Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 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 $ 1,186,289 $ 2,724,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 26,244 28,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,364,227 1,619,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 180,316 193,330
Total investments with an unrealized loss, fair value 4,550,516 4,343,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 206,560 221,614
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 226,406 1,123,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,684 12,223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,111,559 177,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,241 2,054
Total investments with an unrealized loss, fair value 1,337,965 1,301,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 12,925 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 1,251 2,347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 198,385 210,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16,123 24,554
Total investments with an unrealized loss, fair value 199,636 212,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 16,127 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 530,173 990,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,955 9,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 916,298 607,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 76,515 98,356
Total investments with an unrealized loss, fair value 1,446,471 1,598,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 78,470 107,567
State and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 411,231 446,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 20,562 5,590
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 991,290 348,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 67,193 41,145
Total investments with an unrealized loss, fair value 1,402,521 795,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 87,755 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 195 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 195 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 17,033 131,073
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 39 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 146,695 274,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 11,244 27,221
Total investments with an unrealized loss, fair value 163,728 405,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 11,283 $ 28,436