Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 7,821	$ 7,172
Other Comprehensive Income
Increase in Net Unrealized (Loss) Gain on Available-for-Sale Securities	(114)	4,195
Deferred Tax Benefit (Expense) Related to Unrealized Gains (Losses)	48	(1,764)
Reclassification Adjustment for Realized Gains on Available-for-Sale Securities Included in Net Income	0	289
Deferred Tax Benefit Related to Reclassification Adjustment	0	(121)
Change in Net Unrealized (Loss) Gain on Available-for-Sale Securities, Net of Tax	(66)	2,599
Total Other Comprehensive (Loss) Income	(66)	2,599
Comprehensive Income	$ 7,755	$ 9,771