Fair Value - Level 3 Quantitative Information (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Recurring | Interest Rate Swap Agreements | Derivative Financial Instruments, Assets | Weighted Average
Fair Value Inputs
Discount rate	0.99%	1.00%
Recurring | Interest Rate Lock Commitments | Derivative Financial Instruments, Liabilities
Fair Value Inputs
Pull through rates	81.17%
Recurring | Interest Rate Lock Commitments | Derivative Financial Instruments, Liabilities | Weighted Average
Fair Value Inputs
Pull through rates		83.90%
Recurring | Mortgage Servicing Rights | Derivative Financial Instruments, Assets
Fair Value Inputs
Discount rate	8.00%	8.00%
Constant prepayment rate	10.09%	17.96%
Cost of service	$ 50	$ 50
Nonrecurring | Impaired Loans Receivable | Minimum
Fair Value Inputs
Collateral discounts		10.00%
Nonrecurring | Impaired Loans Receivable | Maximum
Fair Value Inputs
Collateral discounts		15.00%
Nonrecurring | Other Real Estate Owned | Weighted Average
Fair Value Inputs
Collateral discounts		15.00%
Level 3 | Recurring | Interest Rate Swap Agreements
Quantitative Information
Assets, Fair Value Disclosure	146,000	196,000
Level 3 | Recurring | Interest Rate Lock Commitments
Quantitative Information
Liabilities, Fair Value Disclosure	484,000	873,000
Level 3 | Recurring | Mortgage Servicing Rights
Quantitative Information
Assets, Fair Value Disclosure	4,381,000	2,525,000
Level 3 | Nonrecurring | Impaired Loans Receivable
Quantitative Information
Assets, Fair Value Disclosure	4,825,000	7,276,000
Level 3 | Nonrecurring | Other Real Estate Owned
Quantitative Information
Assets, Fair Value Disclosure	$ 291,000	$ 5,281,000