Fair Value Measurement (Narrative) (Details Textual) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage Servicing Rights	$ 22,189,000	$ 22,923,000	$ 22,189,000	$ 22,923,000	$ 22,760,000	$ 22,150,000	$ 22,604,000	$ 21,316,000
Mortgage Servicing rights Valuation Allowance	505,000	(572,000)	505,000	(572,000)	282,000	562,000	482,000	(2,564,000)
Mortgage Servicing Rights Net Carrying balance	21,684,000	22,351,000	21,684,000	22,351,000	22,500,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	57,000	(90,000)	(223,000)	(1,992,000)	2,300,000
Impaired Collateral Dependant Loans, Recorded Investment	59,900,000	51,300,000	59,900,000	51,300,000	52,600,000
Determination Of Specific Allowance For Loan Losses	4,500,000	3,100,000	4,500,000	3,100,000	4,800,000
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	55,400,000	48,100,000	55,400,000	48,100,000	47,900,000
Impairment of Real Estate	700,000	300,000			1,400,000
Impairment of Covered Other Real Esate Owned	100,000	200,000			1,000,000
Percent of available for sale securities classified as level 2	90.00%		90.00%
Percentage of Level 3 investments in available for sale investment portfolio	10.00%		10.00%
True up liability, discount period			10 years
True-up Liabitlity Discount Rate	3.31%	3.59%	3.31%	3.59%
True-up Liability Effect of Change in Discount Rate By One Percent	700,000		700,000
True-up Liability Effect of Change in Discount Rate Decrease by One Percent	(700,000)		(700,000)
Number of loans that were 90 days or more past due, or were any on nonaccrual status			0
Midwest
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of true up liability	8,000,000	7,300,000	8,000,000	7,300,000	7,100,000
Percent of cumulative shared loss payments under loss sharing agreements	25.00%		25.00%
Percent of FDIC Intrinsic Loss Estimate	20.00%		20.00%
Intrinsic Loss Estimate of the FDIC	152,000,000		152,000,000
Percent of Asset Premium Paid	25.00%		25.00%
Asset Premium Paid	21,000,000		21,000,000
George Washington
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of true up liability	4,800,000	4,200,000	4,800,000	4,200,000	4,300,000
Percent of excess threshold paid by the Bank under loss sharing agreements	50.00%		50.00%
Percent Theshold of Loss Sharing Agreements Paid by Bank	20.00%		20.00%
Stated Threshold of Loss Sharing Agreements Paid by Bank	34,400,000		34,400,000
Percent of Asset Discount Under Loss Sharing Percent of Asset Discount Under Loss Sharing Agreements	25.00%		25.00%
Stated amount of Asset Discount Under Loss Sharing Agreements	$ 12,000,000		$ 12,000,000
Percent of cumulative shared loss payments under loss sharing agreements	25.00%		25.00%