Securities Available for Sale - Continuous loss (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	$ 71,740	$ 168,722
Unrealized losses, less than 12 months	(981)	(23,346)
Fair value, 12 months or longer	315,760	156,091
Unrealized losses, 12 months or longer	(56,643)	(40,044)
Fair Value	387,500	324,813
Unrealized Losses	(57,624)	(63,390)
Senior asset-backed securities related to Structured Program transactions
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	38,359
Unrealized losses, less than 12 months	(42)
Fair value, 12 months or longer	0
Unrealized losses, 12 months or longer	0
Fair Value	38,359
Unrealized Losses	(42)
U.S. agency residential mortgage-backed securities
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	6,497	111,843
Unrealized losses, less than 12 months	(149)	(15,831)
Fair value, 12 months or longer	201,426	102,584
Unrealized losses, 12 months or longer	(37,348)	(25,417)
Fair Value	207,923	214,427
Unrealized Losses	(37,497)	(41,248)
U.S. agency securities
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	0	50,352
Unrealized losses, less than 12 months	0	(7,213)
Fair value, 12 months or longer	80,104	24,042
Unrealized losses, 12 months or longer	(13,348)	(8,840)
Fair Value	80,104	74,394
Unrealized Losses	(13,348)	(16,053)
Mortgage-backed securities
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	13,973	2,441
Unrealized losses, less than 12 months	(740)	(229)
Fair value, 12 months or longer	23,103	20,077
Unrealized losses, 12 months or longer	(4,695)	(4,241)
Fair Value	37,076	22,518
Unrealized Losses	(5,435)	(4,470)
Other asset-backed securities
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	12,911	4,086
Unrealized losses, less than 12 months	(50)	(73)
Fair value, 12 months or longer	8,538	6,945
Unrealized losses, 12 months or longer	(584)	(712)
Fair Value	21,449	11,031
Unrealized Losses	(634)	(785)
Municipal securities
Schedule of Securities Available-for-Sale [Line Items]
Fair value, less than 12 months	0	0
Unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	2,589	2,443
Unrealized losses, 12 months or longer	(668)	(834)
Fair Value	2,589	2,443
Unrealized Losses	$ (668)	$ (834)