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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax		$ (8,886)	$ 375
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	(2)	(13)
Net other comprehensive income (loss), pre-tax		(8,888)	362
Unrealized holding gains (losses) on available-for-sale securities during the period, tax		1,866	(132)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	0	4
Net other comprehensive income (loss), tax		1,866	(128)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax		(7,020)	243
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	(2)	(9)
Other comprehensive income (loss), net of tax		$ (7,022)	$ 234
[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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