Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 6,352	$ 6,332	$ 18,168	$ 17,684
Other Comprehensive Income (Loss)
Increase (Decrease) in Net Unrealized Gains (Losses) on Available-for-Sale Securities	1,681	2,944	(12,907)	7,865
Reclassification Adjustment for Realized Losses (Gains) on Available-for-Sale Securities Included in Net Income	1,137	(149)	248	(149)
Deferred Tax (Expense) Benefit	(1,185)	(1,175)	5,322	(3,244)
Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities, Net of Tax	1,633	1,620	(7,337)	4,472
Total Other Comprehensive Income (Loss)	1,633	1,620	(7,337)	4,472
Comprehensive Income	$ 7,985	$ 7,952	$ 10,831	$ 22,156