Fair Value of Assets and Liabilities (Fair value on a nonrecurring basis) (Details 4) $ in Thousands	3 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Servicing Rights accounted for under the amortization method, valuation allowance	$ 21	$ 57
Foreclosed Real Estate	1,392	2,311
Foreclosed Real Estate, Valuation Allowance	0	$ 89
Other Assets - Equipment Held for Sale, Valuation Allowance	$ 9,453
Number of Impaired Foreclosed Real Estate		1
Number of Impaired Aircraft	6
Other Asset Impairment Charges	$ 9,500
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Servicing Rights accounted for under the amortization method	21,229	$ 22,091
Foreclosed Real Estate	1,392	$ 2,311
Other Assets - Equipment Held for Sale	$ 4,657