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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ (679)	$ (2,350)	$ 5,642	$ 6,021
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	0	(31)	1	(72)
Net other comprehensive income (loss), pre-tax		(679)	(2,381)	5,643	5,949
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		239	823	(1,975)	(2,106)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	0	10	(1)	25
Net other comprehensive income (loss), tax		239	833	(1,976)	(2,081)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		(440)	(1,527)	3,667	3,915
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	0	(21)	0	(47)
Other comprehensive income (loss), net of tax		$ (440)	$ (1,548)	$ 3,667	$ 3,868
[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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