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Investment Securities - Unrealized Losses on Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | $ 73,115 | $ 46,696
12 Months or Longer | 766,055 | 902,899
Fair Value | 839,170 | 949,595
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (533) | (288)
12 Months or Longer | (92,112) | (95,932)
Unrealized Losses | (92,645) | (96,220)
U.S. government and agency securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 13,417 | 13,750
Fair Value | 13,417 | 13,750
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | 0 | 0
12 Months or Longer | (2,584) | (2,297)
Unrealized Losses | (2,584) | (2,297)
Municipal securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 2,981 | 3,548
12 Months or Longer | 64,458 | 71,458
Fair Value | 67,439 | 75,006
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (20) | (18)
12 Months or Longer | (11,819) | (12,697)
Unrealized Losses | (11,839) | (12,715)
Residential CMO and MBS(1) |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 57,366 | 0
12 Months or Longer | 301,367 | 358,316
Fair Value | 358,733 | 358,316
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (97) | 0
12 Months or Longer | (43,441) | (46,125)
Unrealized Losses | (43,538) | (46,125)
Commercial CMO and MBS(1) |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 6,392 | 37,899
12 Months or Longer | 380,815 | 448,197
Fair Value | 387,207 | 486,096
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (68) | (228)
12 Months or Longer | (34,112) | (34,512)
Unrealized Losses | (34,180) | (34,740)
Corporate obligations |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 6,376 | 911
12 Months or Longer | 3,854 | 3,887
Fair Value | 10,230 | 4,798
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | (348) | (20)
12 Months or Longer | (146) | (114)
Unrealized Losses | (494) | (134)
Other asset-backed securities |  |
Investment Securities, Available for Sale, Fair Value |  |
Less than 12 Months | 0 | 4,338
12 Months or Longer | 2,144 | 7,291
Fair Value | 2,144 | 11,629
Investment Securities, Available-for-Sale, Unrealized Loss |  |
Less than 12 Months | 0 | (22)
12 Months or Longer | (10) | (187)
Unrealized Losses | $ (10) | $ (209)

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