Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value
Less than 12 Months	$ 954,346	$ 334,687
12 Months or Longer	57,820	32,267
Total	1,012,166	366,954
Unrealized Losses
Less than 12 Months	(74,450)	(4,435)
12 Months or Longer	(7,196)	(403)
Total	(81,646)	(4,838)
US Treasury and Government [Member]
Fair Value
Less than 12 Months	64,200	14,828
12 Months or Longer	1,468	0
Total	65,668	14,828
Unrealized Losses
Less than 12 Months	(2,995)	(176)
12 Months or Longer	(249)	0
Total	(3,244)	(176)
Municipal securities
Fair Value
Less than 12 Months	106,205	29,774
12 Months or Longer	15,712	9,351
Total	121,917	39,125
Unrealized Losses
Less than 12 Months	(11,287)	(619)
12 Months or Longer	(3,082)	(235)
Total	(14,369)	(854)
Residential CMO and MBS
Fair Value
Less than 12 Months	352,074	204,039
12 Months or Longer	31,008	19,862
Total	383,082	223,901
Unrealized Losses
Less than 12 Months	(32,446)	(2,470)
12 Months or Longer	(3,371)	(123)
Total	(35,817)	(2,593)
Commercial CMO and MBS
Fair Value
Less than 12 Months	406,835	83,283
12 Months or Longer	8,711	1,936
Total	415,546	85,219
Unrealized Losses
Less than 12 Months	(27,145)	(1,161)
12 Months or Longer	(473)	(38)
Total	(27,618)	(1,199)
Corporate Debt Securities [Member]
Fair Value
Less than 12 Months	5,978
12 Months or Longer	0
Total	5,978
Unrealized Losses
Less than 12 Months	(25)
12 Months or Longer	0
Total	(25)
Other asset-backed securities
Fair Value
Less than 12 Months	19,054	2,763
12 Months or Longer	921	1,118
Total	19,975	3,881
Unrealized Losses
Less than 12 Months	(552)	(9)
12 Months or Longer	(21)	(7)
Total	$ (573)	$ (16)