Fair Value - Level 3 Quantitative Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Recurring | Interest Rate Swaps | Derivative Financial Instruments, Assets | Weighted Average
Fair Value Inputs
Discount rate	1.00%
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 | Weighted Average
Fair Value Inputs
Discount rate	8.00%
Constant prepayment rate	17.96%
Cost of service	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 Swaps
Quantitative Information
Assets, Fair Value Disclosure	196,000
Level 3 | Recurring | Interest Rate Lock Commitments
Quantitative Information
Liabilities, Fair Value Disclosure	873,000
Level 3 | Recurring | Mortgage Servicing Rights
Quantitative Information
Assets, Fair Value Disclosure	2,525,000
Level 3 | Nonrecurring | Impaired Loans Receivable
Quantitative Information
Assets, Fair Value Disclosure	7,276,000
Level 3 | Nonrecurring | Other Real Estate Owned
Quantitative Information
Assets, Fair Value Disclosure	5,281,000