Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 29,723	$ 27,392	$ 25,402
Other Comprehensive (Loss) Income
(Decrease) Increase in Net Unrealized (Loss) Gain on Available-for-Sale Securities	(1,330)	(3,069)	8,719
Deferred Tax Benefit (Expense) Related to Unrealized Gains (Losses)	559	1,290	(3,666)
Reclassification Adjustment for Realized Loss (Gain) on Available-for-Sale Securities Included in Net Income	284	(275)	(90)
Tax (Benefit) Expense Related to Reclassification Adjustment	(119)	116	38
Change in Net Unrealized (Loss) Gain on Available-for-Sale Securities, Net of Tax	(606)	(1,938)	5,001
Total Other Comprehensive (Loss) Income	(606)	(1,938)	5,001
Comprehensive Income	$ 29,117	$ 25,454	$ 30,403