Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 8,581	$ 7,538	$ 24,589	$ 22,042
Other Comprehensive Income
Change in Net Unrealized Gains (Loss) on Available-for-Sale Securities	322	(709)	1,106	4,667
Deferred Tax (Benefit) Expense Related to Unrealized Gains	(135)	299	(465)	(1,962)
Reclassification Adjustment for Realized (Gain) Loss on Available-for-Sale Securities Included in Net Income	0	(3)	(131)	286
Deferred Tax (Benefit) Expense Related to Reclassification Adjustment	0	(409)	55	(120)
Change in Net Unrealized Gains on Available-for-Sale Securities, Net of Tax	187	(822)	565	2,871
Total Other Comprehensive Income (Loss)	187	(822)	565	2,871
Comprehensive Income	$ 8,768	$ 6,716	$ 25,154	$ 24,913