Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Tax effect of net unrealized loss on derivatives reflected in stockholders’ equity	$ 2,280	$ 2,211
Securities	1,865	1,225
Allowance for loan and lease losses	14,908	13,754
Deferred compensation	3,547	2,330
Organization and acquisitions costs	289	467
Net operating loss carryforwards	3,691	2,026
Non-accrual loan interest	939	1,326
OREO writedowns	3,340	4,444
Rehab tax credit projects	2,162	18
Other	1,244	46
Gross deferred tax assets	34,265	27,847
Valuation allowance	(4,167)	(1,964)
Total deferred tax assets	30,098	25,883
Deferred tax liabilities:
Tax effect of net unrealized gain on securities available for sale reflected in stockholders’ equity	(12,353)	(9,603)
Premises, furniture and equipment	(7,877)	(6,402)
Lease financing	0	(93)
Tax bad debt reserves	(600)	(326)
Purchase accounting	(2,085)	(3,434)
Prepaid expenses	(604)	(664)
Mortgage servicing rights	(6,421)	(4,599)
Deferred loan fees	(134)	(194)
Other	(318)	(325)
Gross deferred tax liabilities	(30,392)	(25,640)
Net deferred tax asset (liability)	$ (294)	$ 243