Securities - Held-to-Maturity, Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 160	$ 168	$ 158	$ 168	$ 0
Provision for credit losses	(5)		10	2,987	168
Recoveries credited to the allowance	0		0	0	0
Securities HTM charged against the allowance	0	(3,000)	0	(3,000)	0
Balance at end of period	155		168	155	168
Private label mortgage-backed
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1	1	2	1	0
Provision for credit losses	3		(1)	3	1
Recoveries credited to the allowance	0		0	0	0
Securities HTM charged against the allowance	0		0	0	0
Balance at end of period	4		1	4	1
Obligations of states and political subdivisions
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	39	39	30	39	0
Provision for credit losses	(6)		9	(6)	39
Recoveries credited to the allowance	0		0	0	0
Securities HTM charged against the allowance	0		0	0	0
Balance at end of period	33		39	33	39
Corporate
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	116	123	121	123	0
Provision for credit losses	(2)		2	2,991	123
Recoveries credited to the allowance	0		0	0	0
Securities HTM charged against the allowance	0		0	(3,000)	0
Balance at end of period	114		123	114	123
Trust preferred
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4	$ 5	5	5	0
Provision for credit losses	0		0	(1)	5
Recoveries credited to the allowance	0		0	0	0
Securities HTM charged against the allowance	0		0	0	0
Balance at end of period	$ 4		$ 5	$ 4	$ 5