Investment Securities - Allowance for credit losses of held to maturity securities by major security type (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance	$ 90,000	$ 83,000	$ 37,000
Provision (Recovery)	10,000	26,000	63,000	$ (5,000)
Ending Balance	100,000	109,000	100,000	109,000
Cumulative Effect, Period of Adoption, Adjustment
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance				114,000
U.S. Agency
Schedule of Held-to-Maturity Securities [Line Items]
Ending Balance	0		0
U.S. Agency mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Ending Balance	0		0
Municipal
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance	2,000	3,000	2,000
Provision (Recovery)		(1,000)		(1,000)
Ending Balance	2,000	2,000	2,000	2,000
Municipal | Cumulative Effect, Period of Adoption, Adjustment
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance				3,000
Corporate bonds and other securities
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance	88,000	80,000	35,000
Provision (Recovery)	10,000	27,000	63,000	(4,000)
Ending Balance	$ 98,000	$ 107,000	$ 98,000	107,000
Corporate bonds and other securities | Cumulative Effect, Period of Adoption, Adjustment
Schedule of Held-to-Maturity Securities [Line Items]
Beginning Balance				$ 111,000