Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques - Appraisals of Collateral Valuation Technique [Member] - Impaired Loans [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Valuation Technique	Appraisals of collateral value	Appraisals of collateral value
Commercial Real Estate Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Valuation Technique	Appraisals of collateral value	Appraisals of collateral value
Minimum [Member] | Commercial Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	0.00%	0.00%
Minimum [Member] | Commercial Real Estate Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	8.00%	8.00%
Maximum [Member] | Commercial Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	15.00%	15.00%
Maximum [Member] | Commercial Real Estate Portfolio Segment [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	12.00%	12.00%