Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 9,346	$ 5,848
Other comprehensive income, net of tax:
Unrealized gains on investment securities arising during the period, net of income tax expense of $1,045, and $1,091, respectively	1,712	1,757
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense of $9, and $0, respectively	(14)	0
Total other comprehensive income (loss)	1,698	1,757
Total comprehensive income	$ 11,044	$ 7,605