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Investment Securities - Unrealized Losses on Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months $ 13,050 $ 46,696
12 Months or Longer 619,641 902,899
Fair Value 632,691 949,595
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (113) (288)
12 Months or Longer (59,078) (95,932)
Unrealized Losses (59,191) (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 13,054 13,750
Fair Value 13,054 13,750
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months 0 0
12 Months or Longer (1,885) (2,297)
Unrealized Losses (1,885) (2,297)
Municipal securities    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 0 3,548
12 Months or Longer 56,744 71,458
Fair Value 56,744 75,006
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months 0 (18)
12 Months or Longer (8,956) (12,697)
Unrealized Losses (8,956) (12,715)
Residential CMO and MBS(1)    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 3,150 0
12 Months or Longer 261,630 358,316
Fair Value 264,780 358,316
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (5) 0
12 Months or Longer (31,140) (46,125)
Unrealized Losses (31,145) (46,125)
Commercial CMO and MBS(1)    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 4,419 37,899
12 Months or Longer 284,072 448,197
Fair Value 288,491 486,096
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (54) (228)
12 Months or Longer (17,041) (34,512)
Unrealized Losses (17,095) (34,740)
Corporate obligations    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 3,864 911
12 Months or Longer 3,945 3,887
Fair Value 7,809 4,798
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (47) (20)
12 Months or Longer (55) (114)
Unrealized Losses (102) (134)
Other asset-backed securities    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 1,617 4,338
12 Months or Longer 196 7,291
Fair Value 1,813 11,629
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (7) (22)
12 Months or Longer (1) (187)
Unrealized Losses $ (8) $ (209)