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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ (14,934)	$ (12,217)
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(383)	(256)
Net other comprehensive income (loss), pre-tax		(15,317)	(12,473)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		3,136	2,565
Reclassification adjustment for (gains) losses included in net income, tax	[1]	81	54
Net other comprehensive income (loss), tax		3,217	2,619
Unrealized holding (losses) on available-for-sale securities during the period		(11,798)	(9,652)
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(302)	(202)
Other comprehensive (loss), net of tax		$ (12,100)	$ (9,854)
[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.

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