Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ 8,698	$ 25,411	$ (6,236)	$ 13,194
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(1)	(14)	(384)	(270)
Net other comprehensive income (loss), pre-tax		8,697	25,397	(6,620)	12,924
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		(1,825)	(5,336)	1,311	(2,771)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	0	3	81	57
Net other comprehensive income (loss), tax		(1,825)	(5,333)	1,392	(2,714)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		6,873	20,075	(4,925)	10,423
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(1)	(11)	(303)	(213)
Other comprehensive income (loss), net of tax		$ 6,872	$ 20,064	$ (5,228)	$ 10,210

[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.