Fair Value - Level 3 Quantitative Information (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Recurring | Interest Rate Swap Agreements | Derivative Financial Instruments, Assets | Minimum
Fair Value Inputs
Discount rate	1.00%
Recurring | Interest Rate Swap Agreements | Derivative Financial Instruments, Assets | Maximum
Fair Value Inputs
Discount rate	4.00%
Recurring | Interest Rate Swap Agreements | Derivative Financial Instruments, Assets | Weighted Average
Fair Value Inputs
Discount rate	1.20%
Recurring | Interest Rate Lock Commitments | Derivative Financial Instruments, Liabilities | Minimum
Fair Value Inputs
Pull through rates	81.00%
Recurring | Interest Rate Lock Commitments | Derivative Financial Instruments, Liabilities | Maximum
Fair Value Inputs
Pull through rates	82.00%
Recurring | Mortgage Servicing Rights | Derivative Financial Instruments, Assets
Fair Value Inputs
Discount rate	8.00%
Constant prepayment rate	20.09%
Cost of service	50
Nonrecurring | Impaired Loans Receivable | Minimum
Fair Value Inputs
Collateral discounts	15.00%
Nonrecurring | Impaired Loans Receivable | Maximum
Fair Value Inputs
Collateral discounts	50.00%
Nonrecurring | Other Real Estate Owned | Minimum
Fair Value Inputs
Collateral discounts	6.00%
Nonrecurring | Other Real Estate Owned | Maximum
Fair Value Inputs
Collateral discounts	15.00%
Level 3 | Recurring | Interest Rate Swap Agreements
Quantitative Information
Assets, Fair Value Disclosure	213,000
Level 3 | Recurring | Interest Rate Lock Commitments
Quantitative Information
Liabilities, Fair Value Disclosure	(491,000)
Level 3 | Recurring | Mortgage Servicing Rights
Quantitative Information
Assets, Fair Value Disclosure	2,036,000
Level 3 | Nonrecurring | Impaired Loans Receivable
Quantitative Information
Assets, Fair Value Disclosure	13,793,000
Level 3 | Nonrecurring | Other Real Estate Owned
Quantitative Information
Assets, Fair Value Disclosure	8,715,000