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Investment Securities - Schedule of Unrealized Losses on Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 46,696 $ 846,332
12 Months or Longer 902,899 441,754
Total 949,595 1,288,086
Unrealized Losses    
Less than 12 Months (288) (40,033)
12 Months or Longer (95,932) (88,762)
Total (96,220) (128,795)
U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value    
Less than 12 Months 0 51,900
12 Months or Longer 13,750 11,959
Total 13,750 63,859
Unrealized Losses    
Less than 12 Months 0 (2,031)
12 Months or Longer (2,297) (3,022)
Total (2,297) (5,053)
Municipal securities    
Fair Value    
Less than 12 Months 3,548 82,580
12 Months or Longer 71,458 40,945
Total 75,006 123,525
Unrealized Losses    
Less than 12 Months (18) (5,585)
12 Months or Longer (12,697) (12,648)
Total (12,715) (18,233)
Residential CMO and MBS    
Fair Value    
Less than 12 Months 0 217,949
12 Months or Longer 358,316 206,437
Total 358,316 424,386
Unrealized Losses    
Less than 12 Months 0 (14,770)
12 Months or Longer (46,125) (40,317)
Total (46,125) (55,087)
Commercial CMO and MBS    
Fair Value    
Less than 12 Months 37,899 473,580
12 Months or Longer 448,197 181,692
Total 486,096 655,272
Unrealized Losses    
Less than 12 Months (228) (16,971)
12 Months or Longer (34,512) (32,763)
Total (34,740) (49,734)
Corporate obligations    
Fair Value    
Less than 12 Months 911 3,834
12 Months or Longer 3,887 0
Total 4,798 3,834
Unrealized Losses    
Less than 12 Months (20) (166)
12 Months or Longer (114) 0
Total (134) (166)
Other asset-backed securities    
Fair Value    
Less than 12 Months 4,338 16,489
12 Months or Longer 7,291 721
Total 11,629 17,210
Unrealized Losses    
Less than 12 Months (22) (510)
12 Months or Longer (187) (12)
Total $ (209) $ (522)