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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)