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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 511,624 $ 846,332
12 Months or Longer 747,452 441,754
Total 1,259,076 1,288,086
Unrealized Losses    
Less than 12 Months (11,005) (40,033)
12 Months or Longer (96,157) (88,762)
Total (107,162) (128,795)
US Treasury and Government [Member]    
Fair Value    
Less than 12 Months 0 51,900
12 Months or Longer 64,550 11,959
Total 64,550 63,859
Unrealized Losses    
Less than 12 Months 0 (2,031)
12 Months or Longer (3,964) (3,022)
Total (3,964) (5,053)
Municipal securities    
Fair Value    
Less than 12 Months 5,677 82,580
12 Months or Longer 92,518 40,945
Total 98,195 123,525
Unrealized Losses    
Less than 12 Months (37) (5,585)
12 Months or Longer (14,209) (12,648)
Total (14,246) (18,233)
Residential CMO and MBS    
Fair Value    
Less than 12 Months 142,665 217,949
12 Months or Longer 291,047 206,437
Total 433,712 424,386
Unrealized Losses    
Less than 12 Months (3,401) (14,770)
12 Months or Longer (44,267) (40,317)
Total (47,668) (55,087)
Commercial CMO and MBS    
Fair Value    
Less than 12 Months 350,217 473,580
12 Months or Longer 289,192 181,692
Total 639,409 655,272
Unrealized Losses    
Less than 12 Months (7,332) (16,971)
12 Months or Longer (33,374) (32,763)
Total (40,706) (49,734)
Corporate Debt Securities [Member]    
Fair Value    
Less than 12 Months 3,817 3,834
12 Months or Longer 0 0
Total 3,817 3,834
Unrealized Losses    
Less than 12 Months (183) (166)
12 Months or Longer 0 0
Total (183) (166)
Other asset-backed securities    
Fair Value    
Less than 12 Months 9,248 16,489
12 Months or Longer 10,145 721
Total 19,393 17,210
Unrealized Losses    
Less than 12 Months (52) (510)
12 Months or Longer (343) (12)
Total $ (395) $ (522)