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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |
Gain (Loss) on Investments | $ 0 | $ (454,000) | $ 0
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 370,580,000 | 564,892,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,065,000) | (3,247,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,369,638,000 | 1,365,958,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (243,419,000) | (277,257,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,740,218,000 | 1,930,850,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (244,484,000) | (280,504,000) |
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 |
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 | 867,042,000 | 861,840,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (166,632,000) | (189,761,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 867,042,000 | 861,840,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (166,632,000) | (189,761,000) |
Agency commercial MBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 49,911,000 | 40,291,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (41,000) | (87,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,293,000 | 11,273,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (881,000) | (959,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 61,204,000 | 51,564,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (922,000) | (1,046,000) |
Agency residential CMOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 27,981,000 | 273,347,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (66,000) | (1,994,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 104,865,000 | 104,757,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,083,000) | (18,917,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 132,846,000 | 378,104,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (17,149,000) | (20,911,000) |
Municipal securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0 |
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 | 597,000 | 594,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,000) | (8,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 597,000 | 594,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (5,000) | (8,000) |
Corporate Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 15,968,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (32,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 240,730,000 | 241,744,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (26,097,000) | (31,354,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 240,730,000 | 257,712,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (26,097,000) | (31,386,000) |
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 | 97,388,000 | 180,915,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (285,000) | (1,031,000) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 129,803,000 | 129,178,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (31,373,000) | (34,681,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 227,191,000 | 310,093,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (31,658,000) | (35,712,000) |
Collateralized loan obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 180,076,000 | 38,771,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (659,000) | (29,000) |
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 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 180,076,000 | 38,771,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (659,000) | (29,000) |
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 |
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 | 11,446,000 | 12,372,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,087,000) | (1,213,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 11,446,000 | 12,372,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,087,000) | (1,213,000) |
Asset-backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 15,224,000 | 15,600,000 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (14,000) | (74,000) |
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 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,224,000 | 15,600,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (14,000) | (74,000) |
SBA securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0 |
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 | 3,862,000 | 4,200,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (261,000) | (364,000) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,862,000 | 4,200,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ (261,000) | $ (364,000) |

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