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Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | $ 846,332 | $ 334,687
Unrealized Losses, Less than 12 Months | (40,033) | (4,435)
Fair Value, 12 Months or Longer | 441,754 | 32,267
Unrealized Losses, 12 Months or Longer | (88,762) | (403)
Fair Value, Total | 1,288,086 | 366,954
Unrealized Losses, Total | (128,795) | (4,838)
U.S. government and agency securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 51,900 | 14,828
Unrealized Losses, Less than 12 Months | (2,031) | (176)
Fair Value, 12 Months or Longer | 11,959 | 0
Unrealized Losses, 12 Months or Longer | (3,022) | 0
Fair Value, Total | 63,859 | 14,828
Unrealized Losses, Total | (5,053) | (176)
Municipal securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 82,580 | 29,774
Unrealized Losses, Less than 12 Months | (5,585) | (619)
Fair Value, 12 Months or Longer | 40,945 | 9,351
Unrealized Losses, 12 Months or Longer | (12,648) | (235)
Fair Value, Total | 123,525 | 39,125
Unrealized Losses, Total | (18,233) | (854)
Residential CMO and MBS |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 217,949 | 204,039
Unrealized Losses, Less than 12 Months | (14,770) | (2,470)
Fair Value, 12 Months or Longer | 206,437 | 19,862
Unrealized Losses, 12 Months or Longer | (40,317) | (123)
Fair Value, Total | 424,386 | 223,901
Unrealized Losses, Total | (55,087) | (2,593)
Commercial CMO and MBS |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 473,580 | 83,283
Unrealized Losses, Less than 12 Months | (16,971) | (1,161)
Fair Value, 12 Months or Longer | 181,692 | 1,936
Unrealized Losses, 12 Months or Longer | (32,763) | (38)
Fair Value, Total | 655,272 | 85,219
Unrealized Losses, Total | (49,734) | (1,199)
Other asset-backed securities |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 16,489 | 2,763
Unrealized Losses, Less than 12 Months | (510) | (9)
Fair Value, 12 Months or Longer | 721 | 1,118
Unrealized Losses, 12 Months or Longer | (12) | (7)
Fair Value, Total | 17,210 | 3,881
Unrealized Losses, Total | (522) | $ (16)
Corporate Debt Securities [Member] |  |
Investment Holdings [Line Items] |  |
Fair Value, Less than 12 Months | 3,834 |
Unrealized Losses, Less than 12 Months | (166) |
Fair Value, 12 Months or Longer | 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Fair Value, Total | 3,834 |
Unrealized Losses, Total | $ (166) |

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