Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Impaired loans segregated by class of loans
Unpaid Principal Balance	$ 52,067	$ 24,220
Recorded Investment with Allowance	47,579	22,469
Related Allowance	4,454	3,188
Average Recorded Investment	50,266	24,403
Non-residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	28,184	9,723
Recorded Investment with Allowance	27,165	9,235
Related Allowance	2,122	978
Average Recorded Investment	27,397	10,223
Residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	5,839	6,466
Recorded Investment with Allowance	5,384	5,860
Related Allowance	1,468	1,520
Average Recorded Investment	5,547	6,511
Non-consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	1,792	1,873
Recorded Investment with Allowance	1,163	1,547
Related Allowance	302	358
Average Recorded Investment	1,512	1,806
Consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	349	211
Recorded Investment with Allowance	325	178
Related Allowance	59	47
Average Recorded Investment	389	212
Other loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	2,255	4,418
Recorded Investment with Allowance	2,020	4,285
Related Allowance	212	193
Average Recorded Investment	2,158	4,312
Acquired loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	13,648	1,529
Recorded Investment with Allowance	11,522	1,364
Related Allowance	291	92
Average Recorded Investment	$ 13,263	$ 1,339