Fair Value Measurement (Narrative) (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage Servicing Rights	$ 22,011,000	$ 22,760,000	$ 21,316,000	$ 21,179,000
Mortgage Servicing rights Valuation Allowance	(955,000)	282,000	2,564,000	3,539,000
MSRs, net carrying balance	21,056,000	22,478,000	18,752,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	673,000	(2,282,000)	(975,000)
Impaired Collateral Dependant Loans, Recorded Investment	60,300,000	52,600,000
Determination Of Specific Allowance For Loan Losses	4,300,000	4,800,000
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	56,000,000	47,900,000
Impairment of Other Real Estate Owned	2,600,000	1,400,000
Impairment of Covered Other Real Esate Owned	1,200,000	1,000,000
Percent of available for sale securities classified as level 2	90.00%
Percentage of Level 3 investments in available for sale investment portfolio	10.00%
True up liability, discount period	10 years
True-up Liabitlity Discount Rate	3.36%	3.69%
True-up Liability Effect of Change in Discount Rate Increase By One Percent	700,000	(1,300,000)
Number of loans that were 90 days or more past due, or were any on nonaccrual status	0
Time period for non-payment of loans that are placed on non-accrual status	90 days
Midwest
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent of FDIC Intrinsic Loss Estimate	20.00%
Intrinsic Loss Estimate of the FDIC	152,000,000
Percent of Asset Premium Paid	25.00%
Asset Premium Paid	21,000,000
Percent of cumulative shared loss payments under loss sharing agreements	25.00%
Estimated fair value of true up liability	8,500,000	7,100,000
George Washington
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent of cumulative shared loss payments under loss sharing agreements	25.00%
Estimated fair value of true up liability	4,800,000	4,300,000
Percent of excess threshold paid by the Bank under loss sharing agreements	50.00%
Percent Theshold of Loss Sharing Agreements Paid by Bank	20.00%
Stated Threshold of Loss Sharing Agreements Paid by Bank	34,400,000
Percent of Asset Discount Under Loss Sharing Percent of Asset Discount Under Loss Sharing Agreements	25.00%
Stated amount of Asset Discount Under Loss Sharing Agreements	$ 12,000,000