Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 5,358us-gaap_NetIncomeLoss	$ 3,417us-gaap_NetIncomeLoss
Change in fair value of derivative instruments:
Change in fair value of derivative instruments for the period	(329)	(225)
Income tax effect	115	79
Changes from derivative instruments	(214)	(146)
Change in securities available-for-sale:
Unrealized appreciation for the period on available-for-sale securities	1,962	4,426
Unrealized appreciation for the period on held-to-maturity	(114)
Reclassification adjustment for securities gains realized in income	(124)	0
Income tax effect	(604)	(1,550)
Unrealized gains on available-for-sale securities	1,120	2,876
Other Comprehensive Income, Net of Tax	906	2,730
Comprehensive Income	$ 6,264us-gaap_ComprehensiveIncomeNetOfTax	$ 6,147us-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 before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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