Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 6,403us-gaap_NetIncomeLoss	$ 6,282us-gaap_NetIncomeLoss
Other Comprehensive Income
Increase in Net Unrealized Gain on Available-for-Sale Securities	1,627	3,048
Deferred Tax Expense Related to Unrealized Gains	(684)	(1,282)
Reclassification Adjustment for Realized Gains on Available-for-Sale Securities Included in Net Income	(1)	(3)
Deferred Tax Benefit Related to Reclassification Adjustment	0	2
Change in Net Unrealized Gain on Available-for-Sale Securities, Net of Tax	942	1,765
Total Other Comprehensive Income	942	1,765
Comprehensive Income	$ 7,345us-gaap_ComprehensiveIncomeNetOfTax	$ 8,047us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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