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Securities- Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,152,859 $ 2,724,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 14,726 28,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,329,380 1,619,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 207,735 193,330
Total investments with an unrealized loss, fair value 4,482,239 4,343,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 222,461 221,614
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 957,969 1,123,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,061 12,223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 390,891 177,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5,333 2,054
Total investments with an unrealized loss, fair value 1,348,860 1,301,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 8,394 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 4 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 199,013 210,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18,582 24,554
Total investments with an unrealized loss, fair value 201,281 212,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 18,586 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 805,246 990,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6,802 9,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 599,399 607,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 86,297 98,356
Total investments with an unrealized loss, fair value 1,404,645 1,598,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 93,099 107,567
State and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 328,147 446,241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,502 5,590
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 991,044 348,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 85,210 41,145
Total investments with an unrealized loss, fair value 1,319,191 795,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 88,712 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 59,229 131,073
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,357 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 149,033 274,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12,313 27,221
Total investments with an unrealized loss, fair value 208,262 405,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 13,670 $ 28,436