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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 296,662 $ 846,332
12 Months or Longer 963,315 441,754
Total 1,259,977 1,288,086
Unrealized Losses    
Less than 12 Months (8,537) (40,033)
12 Months or Longer (117,131) (88,762)
Total (125,668) (128,795)
US Treasury and Government [Member]    
Fair Value    
Less than 12 Months 0 51,900
12 Months or Longer 64,259 11,959
Total 64,259 63,859
Unrealized Losses    
Less than 12 Months 0 (2,031)
12 Months or Longer (4,255) (3,022)
Total (4,255) (5,053)
Municipal securities    
Fair Value    
Less than 12 Months 28,423 82,580
12 Months or Longer 90,903 40,945
Total 119,326 123,525
Unrealized Losses    
Less than 12 Months (243) (5,585)
12 Months or Longer (15,471) (12,648)
Total (15,714) (18,233)
Residential CMO and MBS(1)    
Fair Value    
Less than 12 Months 94,015 217,949
12 Months or Longer 316,957 206,437
Total 410,972 424,386
Unrealized Losses    
Less than 12 Months (3,598) (14,770)
12 Months or Longer (51,055) (40,317)
Total (54,653) (55,087)
Commercial CMO and MBS(1)    
Fair Value    
Less than 12 Months 170,005 473,580
12 Months or Longer 475,114 181,692
Total 645,119 655,272
Unrealized Losses    
Less than 12 Months (4,692) (16,971)
12 Months or Longer (45,817) (32,763)
Total (50,509) (49,734)
Corporate Debt Securities [Member]    
Fair Value    
Less than 12 Months 0 3,834
12 Months or Longer 3,774 0
Total 3,774 3,834
Unrealized Losses    
Less than 12 Months 0 (166)
12 Months or Longer (226) 0
Total (226) (166)
Other asset-backed securities    
Fair Value    
Less than 12 Months 4,219 16,489
12 Months or Longer 12,308 721
Total 16,527 17,210
Unrealized Losses    
Less than 12 Months (4) (510)
12 Months or Longer (307) (12)
Total $ (311) $ (522)