Loan and Lease Financings (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Impaired loans and leases
Recorded Investment, With no related allowance recorded	$ 28,635		$ 40,329
Unpaid Principal Balance, With no related allowance recorded	28,637		40,328
Recorded Investment, With an allowance recorded	1,219		944
Unpaid Principal Balance, With an allowance recorded	1,222		944
Total Recorded Investment	29,854		41,273
Total Unpaid Principal Balance	29,859		41,272
Total Related Allowance	226		274
Average Recorded Investment	34,851	42,303
Interest Income	176	157
Commercial and agricultural loans
Impaired loans and leases
Recorded Investment, With no related allowance recorded	11,146		11,231
Unpaid Principal Balance, With no related allowance recorded	11,146		11,230
Recorded Investment, With an allowance recorded	0		0
Unpaid Principal Balance, With an allowance recorded	0		0
Total Related Allowance	0		0
Average Recorded Investment	11,255	8,319
Interest Income	16	3
Auto and light truck
Impaired loans and leases
Recorded Investment, With no related allowance recorded	266		3,499
Unpaid Principal Balance, With no related allowance recorded	266		3,499
Recorded Investment, With an allowance recorded	0		0
Unpaid Principal Balance, With an allowance recorded	0		0
Total Related Allowance	0		0
Average Recorded Investment	1,627	0
Interest Income	0	0
Medium and heavy duty truck
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Recorded Investment, With an allowance recorded	0		0
Unpaid Principal Balance, With an allowance recorded	0		0
Total Related Allowance	0		0
Average Recorded Investment	0	466
Interest Income	0	0
Aircraft financing
Impaired loans and leases
Recorded Investment, With no related allowance recorded	3,650		9,764
Unpaid Principal Balance, With no related allowance recorded	3,652		9,764
Recorded Investment, With an allowance recorded	497		563
Unpaid Principal Balance, With an allowance recorded	497		563
Total Related Allowance	57		113
Average Recorded Investment	6,976	8,268
Interest Income	9	0
Construction equipment financing
Impaired loans and leases
Recorded Investment, With no related allowance recorded	784		938
Unpaid Principal Balance, With no related allowance recorded	784		938
Recorded Investment, With an allowance recorded	345		0
Unpaid Principal Balance, With an allowance recorded	345		0
Total Related Allowance	9		0
Average Recorded Investment	949	4,705
Interest Income	0	2
Commercial real estate
Impaired loans and leases
Recorded Investment, With no related allowance recorded	12,789		14,897
Unpaid Principal Balance, With no related allowance recorded	12,789		14,897
Recorded Investment, With an allowance recorded	0		0
Unpaid Principal Balance, With an allowance recorded	0		0
Total Related Allowance	0		0
Average Recorded Investment	13,666	20,545
Interest Income	147	152
Residential real estate
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Recorded Investment, With an allowance recorded	377		381
Unpaid Principal Balance, With an allowance recorded	380		381
Total Related Allowance	160		161
Average Recorded Investment	378	0
Interest Income	4	0
Consumer loans
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Recorded Investment, With an allowance recorded	0		0
Unpaid Principal Balance, With an allowance recorded	0		0
Total Related Allowance	0		0
Average Recorded Investment	0	0
Interest Income	$ 0	$ 0