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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,173,331 | 2,298,565
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (371,994) | (352,454)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,173,331 | 2,298,565
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 371,994 | 352,454
Agency residential MBS |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,137,469 | 1,187,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (226,776) | (201,192)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,137,469 | 1,187,609
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 226,776 | 201,192
Agency commercial MBS |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 243,387 | 253,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (16,729) | (15,333)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 243,387 | 253,306
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 16,729 | 15,333
Agency residential CMOs |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 281,569 | 265,431
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (36,036) | (36,650)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 281,569 | 265,431
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 36,036 | 36,650
Municipal securities |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,259 | 284,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,386) | (1,109)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 33,259 | 284,334
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,386 | 1,109
Corporate Debt Securities |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 274,022 | 19,952
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (51,642) | (60,254)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 274,022 | 19,952
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 51,642 | 60,254
Collateralized loan obligations |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17,811 | 66,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (89) | (752)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 17,811 | 66,886
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 89 | 752
Private label commercial MBS |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,491 | 28,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,234) | (1,313)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 19,491 | 28,083
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,234 | 1,313
SBA securities |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,911 | 13,739
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,006) | (903)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 12,911 | 13,739
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,006 | 903
Private Label Collateralized Mortgage Obligations |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 153,412 | 158,412
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (37,096) | (34,659)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 153,412 | 158,412
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 37,096 | 34,659
Asset-backed Securities |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 20,813
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (289)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total |  | 20,813
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total |  | $ 289

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