Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	$ 846,332	$ 334,687
Unrealized Losses, Less than 12 Months	(40,033)	(4,435)
Fair Value, 12 Months or Longer	441,754	32,267
Unrealized Losses, 12 Months or Longer	(88,762)	(403)
Fair Value, Total	1,288,086	366,954
Unrealized Losses, Total	(128,795)	(4,838)
U.S. government and agency securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	51,900	14,828
Unrealized Losses, Less than 12 Months	(2,031)	(176)
Fair Value, 12 Months or Longer	11,959	0
Unrealized Losses, 12 Months or Longer	(3,022)	0
Fair Value, Total	63,859	14,828
Unrealized Losses, Total	(5,053)	(176)
Municipal securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	82,580	29,774
Unrealized Losses, Less than 12 Months	(5,585)	(619)
Fair Value, 12 Months or Longer	40,945	9,351
Unrealized Losses, 12 Months or Longer	(12,648)	(235)
Fair Value, Total	123,525	39,125
Unrealized Losses, Total	(18,233)	(854)
Residential CMO and MBS
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	217,949	204,039
Unrealized Losses, Less than 12 Months	(14,770)	(2,470)
Fair Value, 12 Months or Longer	206,437	19,862
Unrealized Losses, 12 Months or Longer	(40,317)	(123)
Fair Value, Total	424,386	223,901
Unrealized Losses, Total	(55,087)	(2,593)
Commercial CMO and MBS
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	473,580	83,283
Unrealized Losses, Less than 12 Months	(16,971)	(1,161)
Fair Value, 12 Months or Longer	181,692	1,936
Unrealized Losses, 12 Months or Longer	(32,763)	(38)
Fair Value, Total	655,272	85,219
Unrealized Losses, Total	(49,734)	(1,199)
Other asset-backed securities
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	16,489	2,763
Unrealized Losses, Less than 12 Months	(510)	(9)
Fair Value, 12 Months or Longer	721	1,118
Unrealized Losses, 12 Months or Longer	(12)	(7)
Fair Value, Total	17,210	3,881
Unrealized Losses, Total	(522)	$ (16)
Corporate Debt Securities [Member]
Investment Holdings [Line Items]
Fair Value, Less than 12 Months	3,834
Unrealized Losses, Less than 12 Months	(166)
Fair Value, 12 Months or Longer	0
Unrealized Losses, 12 Months or Longer	0
Fair Value, Total	3,834
Unrealized Losses, Total	$ (166)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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