Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 27,392	$ 25,402	$ 24,061
Other Comprehensive Income (Loss)
(Decrease) Increase in Net Unrealized (Loss) Gain on Available-for-Sale Securities	(3,069)	8,719	(16,564)
Deferred Tax Benefit (Expense) Related to Unrealized Gains (Losses)	1,290	(3,666)	6,965
Reclassification Adjustment for Realized (Gain) Loss on Available-for-Sale Securities Included in Net Income	(275)	(90)	229
Tax Expense (Benefit) Related to Reclassification Adjustment	116	38	(97)
Change in Net Unrealized (Loss) Gain on Available-for-Sale Securities, Net of Tax	(1,938)	5,001	(9,467)
Total Other Comprehensive (Loss) Income	(1,938)	5,001	(9,467)
Comprehensive Income	$ 25,454	$ 30,403	$ 14,594