Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ 700	$ 3,960	$ 13,894	$ 18,984
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(48)	(15)	(318)	18
Net other comprehensive income (loss), pre-tax		652	3,945	13,576	19,002
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		(147)	(831)	(2,918)	(3,974)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	9	3	66	(4)
Net other comprehensive income (loss), tax		(138)	(828)	(2,852)	(3,978)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		553	3,129	10,976	15,010
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(39)	(12)	(252)	14
Other comprehensive income, net of tax		$ 514	$ 3,117	$ 10,724	$ 15,024

[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.