Loan and Lease Financings (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Impaired loans and leases
Recorded Investment, With no related allowance recorded	$ 25,918		$ 25,918		$ 30,968
Unpaid Principal Balance, With no related allowance recorded	25,915		25,915		30,966
Recorded Investment, With an allowance recorded	14,321		14,321		9,749
Unpaid Principal Balance, With an allowance recorded	14,321		14,321		9,748
Total Recorded Investment	40,239		40,239		40,717
Total Unpaid Principal Balance	40,236		40,236		40,714
Total Related Allowance	1,540		1,540		1,623
Average Recorded Investment	40,782	45,596	40,873	48,474
Interest Income	333	143	675	332
Commercial and agricultural loans
Impaired loans and leases
Recorded Investment, With no related allowance recorded	6,470		6,470		2,572
Unpaid Principal Balance, With no related allowance recorded	6,468		6,468		2,572
Recorded Investment, With an allowance recorded	5,189		5,189		6,075
Unpaid Principal Balance, With an allowance recorded	5,189		5,189		6,074
Total Related Allowance	49		49		729
Average Recorded Investment	11,766	9,111	9,645	9,441
Interest Income	98	2	133	12
Auto, light truck and environmental equipment
Impaired loans and leases
Recorded Investment, With no related allowance recorded					474
Unpaid Principal Balance, With no related allowance recorded					474
Average Recorded Investment	39	2,578	221	2,474
Interest Income				7
Medium and heavy duty truck
Impaired loans and leases
Recorded Investment, With no related allowance recorded	594		594
Unpaid Principal Balance, With no related allowance recorded	594		594
Average Recorded Investment	638	434	292	917
Interest Income		1		2
Aircraft financing
Impaired loans and leases
Recorded Investment, With no related allowance recorded	2,301		2,301		3,115
Unpaid Principal Balance, With no related allowance recorded	2,301		2,301		3,115
Recorded Investment, With an allowance recorded	9,132		9,132		2,086
Unpaid Principal Balance, With an allowance recorded	9,132		9,132		2,086
Total Related Allowance	1,491		1,491		852
Average Recorded Investment	10,361	6,100	8,832	8,831
Interest Income	79		79
Construction equipment financing
Impaired loans and leases
Recorded Investment, With no related allowance recorded	1,214		1,214		5,109
Unpaid Principal Balance, With no related allowance recorded	1,213		1,213		5,107
Average Recorded Investment	1,447	4,512	3,376	4,399
Interest Income	1		4	5
Commercial real estate
Impaired loans and leases
Recorded Investment, With no related allowance recorded	15,339		15,339		19,597
Unpaid Principal Balance, With no related allowance recorded	15,339		15,339		19,597
Recorded Investment, With an allowance recorded					1,588
Unpaid Principal Balance, With an allowance recorded					1,588
Total Related Allowance					42
Average Recorded Investment	16,531	22,757	18,507	22,330
Interest Income	155	138	459	302
Residential real estate
Impaired loans and leases
Recorded Investment, With no related allowance recorded					101
Unpaid Principal Balance, With no related allowance recorded					101
Average Recorded Investment		104		82
Interest Income		$ 2		$ 4