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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Gain (Loss) on Investments | $ 0 | $ 0 | $ 0 | $ 0 |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 38,297,000 |  | 38,297,000 |  | $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (114,000) |  | (114,000) |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,114,167,000 |  | 2,114,167,000 |  | 2,298,565,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (371,265,000) |  | (371,265,000) |  | (352,454,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,152,464,000 |  | 2,152,464,000 |  | 2,298,565,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (371,379,000) |  | (371,379,000) |  | (352,454,000)
Agency residential MBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,101,862,000 |  | 1,101,862,000 |  | 1,187,609,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (232,132,000) |  | (232,132,000) |  | (201,192,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,101,862,000 |  | 1,101,862,000 |  | 1,187,609,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (232,132,000) |  | (232,132,000) |  | (201,192,000)
Agency commercial MBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 241,343,000 |  | 241,343,000 |  | 253,306,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (16,577,000) |  | (16,577,000) |  | (15,333,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 241,343,000 |  | 241,343,000 |  | 253,306,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (16,577,000) |  | (16,577,000) |  | (15,333,000)
Agency residential CMOs |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 278,260,000 |  | 278,260,000 |  | 265,431,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (34,828,000) |  | (34,828,000) |  | (36,650,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 278,260,000 |  | 278,260,000 |  | 265,431,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (34,828,000) |  | (34,828,000) |  | (36,650,000)
Municipal securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,057,000 |  | 33,057,000 |  | 284,334,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,484,000) |  | (1,484,000) |  | (1,109,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 33,057,000 |  | 33,057,000 |  | 284,334,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,484,000) |  | (1,484,000) |  | (1,109,000)
Corporate Debt Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 278,895,000 |  | 278,895,000 |  | 19,952,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (46,746,000) |  | (46,746,000) |  | (60,254,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 278,895,000 |  | 278,895,000 |  | 19,952,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (46,746,000) |  | (46,746,000) |  | (60,254,000)
Private Label Collateralized Mortgage Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 150,286,000 |  | 150,286,000 |  | 158,412,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (37,430,000) |  | (37,430,000) |  | (34,659,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 150,286,000 |  | 150,286,000 |  | 158,412,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (37,430,000) |  | (37,430,000) |  | (34,659,000)
Collateralized loan obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 20,852,000 |  | 20,852,000 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (86,000) |  | (86,000) |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |  | 0 |  | 66,886,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |  | 0 |  | (752,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 20,852,000 |  | 20,852,000 |  | 66,886,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (86,000) |  | (86,000) |  | (752,000)
Private label commercial MBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18,076,000 |  | 18,076,000 |  | 28,083,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,068,000) |  | (1,068,000) |  | (1,313,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 18,076,000 |  | 18,076,000 |  | 28,083,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,068,000) |  | (1,068,000) |  | (1,313,000)
Asset-backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 17,445,000 |  | 17,445,000 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (28,000) |  | (28,000) |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |  | 0 |  | 20,813,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |  | 0 |  | (289,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 17,445,000 |  | 17,445,000 |  | 20,813,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (28,000) |  | (28,000) |  | (289,000)
SBA securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |  | 0 |  | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  | 0 |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,388,000 |  | 12,388,000 |  | 13,739,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,000,000) |  | (1,000,000) |  | (903,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,388,000 |  | 12,388,000 |  | 13,739,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ (1,000,000) |  | $ (1,000,000) |  | $ (903,000)

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