Loans (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 40,861	$ 44,452	$ 41,811
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	21,303	19,440	20,395
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	19,558	25,012	21,416
Performing [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	30,406	20,394	15,543
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	14,750	4,765	3,938
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	15,656	15,629	11,605
Nonperforming [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	10,455	24,058	26,268
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	6,553	14,675	16,457
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 3,902	$ 9,383	$ 9,811