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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ (12,217)	$ 5,821
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(256)	34
Net other comprehensive income (loss), pre-tax		(12,473)	5,855
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		2,565	(1,223)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	54	(7)
Net other comprehensive income (loss), tax		2,619	(1,230)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		(9,652)	4,598
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(202)	27
Other comprehensive income (loss), net of tax		$ (9,854)	$ 4,625
[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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