Fair Value - Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning balance	$ 4,121	$ 4,531	$ 5,254
Total realized/unrealized gains or losses - Included in other comprehensive income	83	38	(373)
Settlements		(365)	(350)
Ending balance	4,204	4,204	4,531
State and municipal obligations
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning balance	1,180	1,545	1,895
Settlements		(365)	(350)
Ending balance	1,180	1,180	1,545
Collateralized debt obligations
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning balance	2,941	2,986	3,359
Total realized/unrealized gains or losses - Included in other comprehensive income	83	38	(373)
Ending balance	$ 3,024	$ 3,024	$ 2,986