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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ 5,821	$ (8,886)
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	34	(2)
Net other comprehensive income (loss), pre-tax		5,855	(8,888)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		(1,223)	1,866
Reclassification adjustment for (gains) losses included in net income, tax	[1]	(7)	0
Net other comprehensive income (loss), tax		(1,230)	1,866
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		4,598	(7,020)
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	27	(2)
Other comprehensive income (loss), net of tax		$ 4,625	$ (7,022)
[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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