Noninterest Income and Expenses (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended							9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of noninterest expense
Base salaries, net of deferred loan origination costs	$ 8,337				$ 7,480			$ 24,769	$ 21,682
Incentive compensation	1,254				1,848			3,976	3,547
Benefits and other compensation costs	2,771				2,602			8,869	8,209
Total salaries and benefits expense	12,362				11,930			37,614	33,438
Occupancy	1,851				1,521			5,424	4,383
Equipment	1,138				949			3,381	2,750
Data processing and software	1,017				940			3,589	2,748
ATM network charges	529				425			1,628	1,414
Telecommunications	553				382			1,675	1,308
Postage	230				163			704	598
Courier service	270				222			715	651
Advertising	710				607			2,071	1,778
Assessments	590				517			1,786	1,902
Operational losses	171				166			430	393
Professional fees	832				462			1,946	1,322
Foreclosed assets expense	284				215			1,076	497
Provision for foreclosed asset losses	433				306			1,520	1,393
Change in reserve for unfunded commitments	(35)							(185)
Intangible amortization	52				20			157	125
Legal settlement	2,090							2,090
Other	2,513				2,048			7,251	5,939
Total other noninterest expense	13,228				8,943			35,258	27,201
Total noninterest expense	$ 25,590	$ 24,367	$ 22,915	$ 22,076	$ 20,873	$ 20,095	$ 19,671	$ 72,872	$ 60,639