Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Impaired loans segregated by class of loans
Unpaid Principal Balance	$ 50,415	$ 55,964
Recorded Investment with Allowance	45,230	51,175
Related Allowance	4,378	4,932
Average Recorded Investment	45,859	49,006
Non-residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	27,949	28,420
Recorded Investment with Allowance	26,417	27,558
Related Allowance	2,185	2,235
Average Recorded Investment	26,814	22,887
Residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	6,079	6,185
Recorded Investment with Allowance	5,472	5,695
Related Allowance	1,337	1,432
Average Recorded Investment	4,847	5,557
Non-consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	1,899	2,062
Recorded Investment with Allowance	1,565	1,748
Related Allowance	452	605
Average Recorded Investment	2,249	1,664
Consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	441	567
Recorded Investment with Allowance	421	477
Related Allowance	96	65
Average Recorded Investment	408	452
Other loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	3,736	1,880
Recorded Investment with Allowance	3,094	1,524
Related Allowance	267	320
Average Recorded Investment	2,648	2,666
Acquired loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	10,311	16,850
Recorded Investment with Allowance	8,261	14,173
Related Allowance	41	275
Average Recorded Investment	$ 8,893	$ 15,780