Loan and Lease Financings (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 modification default	Mar. 31, 2013 item modification	Dec. 31, 2013
Loans and leases classified as TDR
Number of Modifications	1	1
Recorded Investment	$ 596	$ 25
Number of troubled debt restructured loans and leases which had payment defaults	0	0
Loans and leases classified as troubled debt restructuring	18,765		20,610
Troubled debt restructured loans and leases which had payment defaults within twelve months following modification
Default threshold	90 days
Performing
Loans and leases classified as TDR
Number of Modifications	1	0
Recorded Investment	596	0
Loans and leases classified as troubled debt restructuring	9,331		8,786
Performing | Commercial and agricultural loans
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Aircraft financing
Loans and leases classified as TDR
Number of Modifications	1	0
Recorded Investment	596	0
Performing | Construction equipment financing
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Commercial real estate
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Residential real estate
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Auto and light truck
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Medium and heavy duty truck
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Performing | Consumer loans
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming
Loans and leases classified as TDR
Number of Modifications	0	1
Recorded Investment	0	25
Loans and leases classified as troubled debt restructuring	9,434		11,824
Nonperforming | Commercial and agricultural loans
Loans and leases classified as TDR
Number of Modifications	0	1
Recorded Investment	0	25
Nonperforming | Aircraft financing
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Construction equipment financing
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Commercial real estate
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Residential real estate
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Auto and light truck
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Medium and heavy duty truck
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	0	0
Nonperforming | Consumer loans
Loans and leases classified as TDR
Number of Modifications	0	0
Recorded Investment	$ 0	$ 0