Fair Value of Assets and Liabilities, Part II (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	$ 347,000		$ 568,000
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Assets, Fair Value Disclosure, Recurring	462,000		191,000
Financial Assets [Abstract]
Available-for-sale securities	375,632,000		488,724,000
Held-to-maturity Securities, Fair Value	53,440,000		0
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and due from banks	57,077,000		64,605,000
Federal funds sold	495,000		497,000
Available-for-sale securities	375,632,000		488,724,000
Held-to-maturity Securities, Fair Value	53,594,000
Loans held for sale	1,680,000		514,000
Loans net of allowance for loan losses	1,025,623,000		969,041,000
Interest receivable	6,976,000		6,614,000
Federal Reserve Bank stock	1,522,000		1,522,000
Federal Home Loan Bank stock	3,391,000		3,391,000
Financial Liabilities [Abstract]
Deposits	1,298,840,000		1,287,616,000
Securities sold under agreements to repurchase	88,066,000		119,187,000
Interest payable	311,000		277,000
Federal Home Loan Bank borrowings	15,000,000		20,000,000
Junior subordinated debentures	20,620,000		20,620,000
Fair Value [Member]
Financial Assets [Abstract]
Cash and due from banks	57,077,000		64,605,000
Federal funds sold	495,000		497,000
Available-for-sale securities	375,632,000		488,724,000
Held-to-maturity Securities, Fair Value	53,440,000
Loans held for sale	1,680,000		514,000
Loans net of allowance for loan losses	1,035,552,000		964,253,000
Interest receivable	6,976,000		6,614,000
Federal Reserve Bank stock	1,522,000		1,522,000
Federal Home Loan Bank stock	3,391,000		3,391,000
Financial Liabilities [Abstract]
Deposits	1,298,767,000		1,287,887,000
Securities sold under agreements to repurchase	88,071,000		119,190,000
Interest payable	311,000		277,000
Federal Home Loan Bank borrowings	15,428,000		20,530,000
Junior subordinated debentures	12,397,000		12,041,000
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount [Member]
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	347,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	222,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets [Abstract]
Cash and due from banks	57,077,000		64,605,000
Federal funds sold	495,000		497,000
Available-for-sale securities	58,000		67,000
Held-to-maturity Securities, Fair Value	0
Loans held for sale	0		0
Loans net of allowance for loan losses	0		0
Interest receivable	0		0
Federal Reserve Bank stock	0		0
Federal Home Loan Bank stock	0		0
Financial Liabilities [Abstract]
Deposits	0		0
Securities sold under agreements to repurchase	0		0
Interest payable	0		0
Federal Home Loan Bank borrowings	0		0
Junior subordinated debentures	0		0
Significant Other Observable Inputs (Level 2)
Financial Assets [Abstract]
Cash and due from banks	0		0
Federal funds sold	0		0
Available-for-sale securities	375,112,000		488,466,000
Held-to-maturity Securities, Fair Value	53,440,000
Loans held for sale	1,680,000		514,000
Loans net of allowance for loan losses	0		0
Interest receivable	6,976,000		6,614,000
Federal Reserve Bank stock	1,522,000		1,522,000
Federal Home Loan Bank stock	3,391,000		3,391,000
Financial Liabilities [Abstract]
Deposits	1,057,612,000		1,058,965,000
Securities sold under agreements to repurchase	88,071,000		119,190,000
Interest payable	311,000		277,000
Federal Home Loan Bank borrowings	15,428,000		20,530,000
Junior subordinated debentures	12,397,000		12,041,000
Significant Unobservable Inputs (Level 3)
Financial Assets [Abstract]
Cash and due from banks	0		0
Federal funds sold	0		0
Available-for-sale securities	462,000		191,000
Held-to-maturity Securities, Fair Value	0
Loans held for sale	0		0
Loans net of allowance for loan losses	1,035,552,000		964,253,000
Interest receivable	0		0
Federal Reserve Bank stock	0		0
Federal Home Loan Bank stock	0		0
Financial Liabilities [Abstract]
Deposits	241,155,000		228,922,000
Securities sold under agreements to repurchase	0		0
Interest payable	0		0
Federal Home Loan Bank borrowings	0		0
Junior subordinated debentures	0		0
Trust preferred securities | Significant Unobservable Inputs (Level 3) | Discounted Cash Flow [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount rate (in hundredths)	12.40%		15.50%
Constant prepayment rate (in hundredths)	1.30%	[1]	1.30%	[1]
Cumulative projected prepayments (in hundredths)	24.30%		23.50%
Probability of default (in hundredths)	0.20%		0.20%
Loss severity (in hundredths)	97.10%		96.10%
Projected cures given deferral (in hundredths)	43.50%		50.60%
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,327,000		1,383,000
Impaired loans (collateral dependent) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	0		0
Impaired loans (collateral dependent) | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	0		0
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	0.00%		0.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	40.00%		40.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	20.00%		20.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,327,000		1,383,000
Assets Held-for-sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	222,000		172,000
Assets Held-for-sale [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	0		0
Assets Held-for-sale [Member] | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	0		0
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	0.00%		0.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	40.00%		40.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)			35.00%
Discount to reflect realizable value less estimated selling costs (in hundredths)	35.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 222,000		$ 172,000

[1] Every five years