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Investment Securities - Unrealized Losses on Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months $ 98,004 $ 846,332
12 Months or Longer 1,031,088 441,754
Fair Value 1,129,092 1,288,086
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (1,785) (40,033)
12 Months or Longer (143,242) (88,762)
Unrealized Losses (145,027) (128,795)
U.S. government and agency securities    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 0 51,900
12 Months or Longer 20,424 11,959
Fair Value 20,424 63,859
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months 0 (2,031)
12 Months or Longer (3,109) (3,022)
Unrealized Losses (3,109) (5,053)
Municipal securities    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 17,390 82,580
12 Months or Longer 84,118 40,945
Fair Value 101,508 123,525
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (485) (5,585)
12 Months or Longer (19,480) (12,648)
Unrealized Losses (19,965) (18,233)
Residential CMO and MBS    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 35,167 217,949
12 Months or Longer 366,014 206,437
Fair Value 401,181 424,386
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (515) (14,770)
12 Months or Longer (66,478) (40,317)
Unrealized Losses (66,993) (55,087)
Commercial CMO and MBS    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 44,981 473,580
12 Months or Longer 549,283 181,692
Fair Value 594,264 655,272
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months (785) (16,971)
12 Months or Longer (53,720) (32,763)
Unrealized Losses (54,505) (49,734)
Corporate obligations    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 0 3,834
12 Months or Longer 3,780 0
Fair Value 3,780 3,834
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months 0 (166)
12 Months or Longer (220) 0
Unrealized Losses (220) (166)
Other asset-backed securities    
Investment Securities, Available for Sale, Fair Value    
Less than 12 Months 466 16,489
12 Months or Longer 7,469 721
Fair Value 7,935 17,210
Investment Securities, Available-for-Sale, Unrealized Loss    
Less than 12 Months 0 (510)
12 Months or Longer (235) (12)
Unrealized Losses $ (235) $ (522)