Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the year, pre-tax		$ (278,620)	$ (15,333)	$ 16,651
Reclassification adjustment for gains included in net income, pre-tax	[1]	415	(838)	(385)
Net unrealized holding gains (losses)		(278,205)	(16,171)	16,266
Change in funded status of post-retirement plan, pre-tax		(4)	48
Net other comprehensive income (loss), pre-tax		(278,209)	(16,123)	16,266
Unrealized holding gains (losses) on available-for-sale securities during the year, tax		58,510	3,220	(3,970)
Tax provision related to net realized gain	[1]	(87)	176	(90)
Net unrealized gains (losses) on available-for-sale securities, tax		58,423	3,396	(4,060)
Change in funded status of post-retirement plan, tax		1	(10)
Net other comprehensive income (loss), tax		58,424	3,386	(4,060)
Unrealized holding gains (losses) on available-for-sale securities during the year, after tax		(220,110)	(12,113)	12,681
Reclassification adjustment for gains included in net income, after-tax	[1]	328	(662)	(475)
Unrealized holding gains (losses), net of reclassification and tax		(219,782)	(12,775)	12,206
Change in funded status of post-retirement plan, net of tax		(3)	38	0
Other comprehensive income (loss), net of tax		$ (219,785)	$ (12,737)	$ 12,206

[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.