Loan and Lease Financings (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 modification default	Dec. 31, 2012 default modification
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	4	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,446	$ 9,699
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	750	284
Financing Receivable, Modifications, Recorded Investment	20,610	21,708
Troubled debt restructured loans and leases which had payment defaults within twelve months following modification
Financing Receivable Modifications Subsequent Payment Default Period Past Due	90 days
Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,131	7,242
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	750	0
Financing Receivable, Modifications, Recorded Investment	8,786	8,839
Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	2	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,315	2,457
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	284
Financing Receivable, Modifications, Recorded Investment	11,824	12,869
Commercial and agricultural loans | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	750	127
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	750	0
Commercial and agricultural loans | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	158	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	113
Auto, light truck and environmental equipment | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Auto, light truck and environmental equipment | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Medium and heavy duty truck | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Medium and heavy duty truck | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Aircraft financing | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Aircraft financing | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,157	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Construction equipment financing | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Construction equipment financing | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1,316
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial real estate | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	7,014
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial real estate | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1,141
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	171
Residential real estate | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	381	101
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Residential real estate | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer loans | Performing
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer loans | Nonperforming
Loans and leases classified as TDR
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0