Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Impaired loans segregated by class of loans
Unpaid Principal Balance	$ 52,140	$ 27,101
Recorded Investment with Allowance	47,482	24,088
Related Allowance	4,276	3,345
Average Recorded Investment	47,601	24,591
Non-residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	27,593	9,285
Recorded Investment with Allowance	26,434	8,671
Related Allowance	1,813	978
Average Recorded Investment	26,733	9,835
Residential real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	5,664	6,520
Recorded Investment with Allowance	5,136	5,871
Related Allowance	1,374	1,520
Average Recorded Investment	5,333	6,351
Non-consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	3,144	1,584
Recorded Investment with Allowance	2,539	1,286
Related Allowance	677	358
Average Recorded Investment	1,745	1,676
Consumer non-real estate [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	447	215
Recorded Investment with Allowance	424	180
Related Allowance	77	47
Average Recorded Investment	364	204
Other loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	2,420	3,888
Recorded Investment with Allowance	2,265	3,794
Related Allowance	264	342
Average Recorded Investment	1,975	4,296
Acquired loans [Member]
Impaired loans segregated by class of loans
Unpaid Principal Balance	12,872	5,609
Recorded Investment with Allowance	10,684	4,286
Related Allowance	71	100
Average Recorded Investment	$ 11,451	$ 2,229