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Investment Securities - Unrealized Losses on Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | $ 98,004 | $ 846,332
12 Months or Longer | 1,031,088 | 441,754
Fair Value | 1,129,092 | 1,288,086
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (1,785) | (40,033)
12 Months or Longer | (143,242) | (88,762)
Unrealized Losses | (145,027) | (128,795)
U.S. government and agency securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 0 | 51,900
12 Months or Longer | 20,424 | 11,959
Fair Value | 20,424 | 63,859
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | 0 | (2,031)
12 Months or Longer | (3,109) | (3,022)
Unrealized Losses | (3,109) | (5,053)
Municipal securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 17,390 | 82,580
12 Months or Longer | 84,118 | 40,945
Fair Value | 101,508 | 123,525
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (485) | (5,585)
12 Months or Longer | (19,480) | (12,648)
Unrealized Losses | (19,965) | (18,233)
Residential CMO and MBS |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 35,167 | 217,949
12 Months or Longer | 366,014 | 206,437
Fair Value | 401,181 | 424,386
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (515) | (14,770)
12 Months or Longer | (66,478) | (40,317)
Unrealized Losses | (66,993) | (55,087)
Commercial CMO and MBS |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 44,981 | 473,580
12 Months or Longer | 549,283 | 181,692
Fair Value | 594,264 | 655,272
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (785) | (16,971)
12 Months or Longer | (53,720) | (32,763)
Unrealized Losses | (54,505) | (49,734)
Corporate obligations |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 0 | 3,834
12 Months or Longer | 3,780 | 0
Fair Value | 3,780 | 3,834
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | 0 | (166)
12 Months or Longer | (220) | 0
Unrealized Losses | (220) | (166)
Other asset-backed securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 466 | 16,489
12 Months or Longer | 7,469 | 721
Fair Value | 7,935 | 17,210
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | 0 | (510)
12 Months or Longer | (235) | (12)
Unrealized Losses | $ (235) | $ (522)

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