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	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
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	$ 4,182	$ 4,531
Total realized/unrealized gains or losses - Included in other comprehensive income	(114)	16
Settlements	(375)	(365)
Ending balance	3,693	4,182
State and municipal
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
Settlements	(375)	(365)
Ending balance	805	1,180
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	3,002	2,986
Total realized/unrealized gains or losses - Included in other comprehensive income	(114)	16
Ending balance	$ 2,888	$ 3,002