Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ (2,754)	$ 700	$ (8,990)	$ 13,894
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(464)	(48)	(848)	(318)
Net other comprehensive income (loss), pre-tax		(3,218)	652	(9,838)	13,576
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		578	(147)	1,888	(2,918)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	96	9	178	66
Net other comprehensive income (loss), tax		674	(138)	2,066	(2,852)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		(2,176)	553	(7,102)	10,976
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(368)	(39)	(670)	(252)
Other comprehensive income (loss), net of tax		$ (2,544)	$ 514	$ (7,772)	$ 10,724

[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.