Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Comprehensive Income Net Of Tax [Abstract]
Unrealized holding gains on available-for-sale securities during the period, pre-tax		$ 3,357	$ 2,310
Reclassification adjustment for (gains) losses included in net income, pre-tax	[1]	0	(10)
Net unrealized holding gains		3,357	2,300
Unrealized holding gains on available-for-sale securities during the period, tax		(1,175)	(808)
Reclassification adjustment for (gains) losses included in net income, tax	[1]	0	2
Net unrealized gains on available-for-sale securities, tax		(1,175)	(806)
Unrealized holding gains on available-for-sale securities during the period, after-tax		2,182	1,502
Reclassification adjustment for (gains) losses included in net income, after-tax	[1]	0	(8)
Net unrealized gains on available-for-sale securities, after-tax		$ 2,182	$ 1,494

[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.