Mergers and Acquisitions - Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Combinations [Abstract]
Net interest income	$ 38,316	$ 39,833	$ 76,401	$ 68,205
Net income	$ 9,282	$ 8,736	$ 16,928	$ 13,579
Net income per common share: Basic (in dollars per share)	$ 0.29	$ 0.31	$ 0.54	$ 0.50
Net income per common share: Diluted (in dollars per share)	$ 0.29	$ 0.31	$ 0.54	$ 0.50
Weighted average common shares: Basic	31,486,304	28,554,194	30,988,416	26,970,712
Weighted average common shares: Diluted	31,642,902	28,578,395	31,140,464	26,976,444