Investment Securities - Allowance for credit losses of available for sale securities by major security type (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 116,000	$ 926,000	$ 926,000
Charge-Offs			(491,000)
Recoveries			75,000
Provisions (Recovery)	244,000		(75,000)	$ 926,000
Ending Balance	360,000	116,000	360,000	926,000
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Beginning Balance	116,000	926,000	926,000
Charge-Offs			(491,000)
Provisions (Recovery)	244,000		(75,000)	926,000
Ending Balance	$ 360,000	$ 116,000	$ 360,000	$ 926,000