Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of factors used in computing basic and diluted earnings per common share
Net income available to common shareholders	$ 6,791	$ 4,029	$ 12,393	$ 7,719
Less: undistributed earnings allocated to Series C Preferred Stock	(576)	(331)	(979)	(605)
Distributed and undistributed earnings allocated to common shareholders	$ 6,215	$ 3,698	$ 11,414	$ 7,114
Weighted average common shares outstanding for basic earnings per common share (in shares)	32,243,935	26,573,909	32,184,825	26,541,816
Dilutive effect of stock options outstanding, using the treasury stock method (in shares)	268,676	193,346	260,691	182,444
Shares used in computing diluted earnings per common share (in shares)	32,512,611	26,767,255	32,445,516	26,724,260
Basic earnings per share (in dollars per share)	$ 0.19	$ 0.14	$ 0.35	$ 0.27
Diluted earnings per share (in dollars per share)	$ 0.19	$ 0.14	$ 0.35	$ 0.27