Fair Value of Assets and Liabilities, Part II (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	243,000		263,000
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Assets, Fair Value Disclosure, Recurring	2,166,000		364,000
Financial Assets [Abstract]
Available-for-sale securities	405,523,000		377,856,000
Held-to-maturity Securities	48,799,000		53,650,000
Held-to-maturity Securities, Fair Value	49,977,000		53,937,000
Financial Liabilities [Abstract]
Other Borrowings	2,000,000		0
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and due from banks	55,474,000		51,236,000
Federal funds sold	493,000		494,000
Available-for-sale securities	405,523,000		377,856,000
Held-to-maturity Securities	48,799,000		53,650,000
Loans held for sale	868,000		1,958,000
Loans net of allowance for loan losses	1,039,182,000		1,046,766,000
Interest receivable	6,009,000		6,828,000
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	1,279,103,000		1,272,077,000
Securities sold under agreements to repurchase	116,596,000		121,869,000
Interest payable	305,000		285,000
Federal Home Loan Bank borrowings	25,000,000		20,000,000
Other Borrowings	2,000,000
Junior subordinated debentures	20,620,000		20,620,000
Fair Value [Member]
Financial Assets [Abstract]
Cash and due from banks	55,474,000		51,236,000
Federal funds sold	493,000		494,000
Available-for-sale securities	405,523,000		377,856,000
Held-to-maturity Securities, Fair Value	49,977,000		53,937,000
Loans held for sale	868,000		1,958,000
Loans net of allowance for loan losses	1,046,266,000		1,051,110,000
Interest receivable	6,009,000		6,828,000
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	1,279,452,000		1,272,358,000
Securities sold under agreements to repurchase	116,604,000		121,870,000
Interest payable	305,000		285,000
Federal Home Loan Bank borrowings	25,797,000		20,541,000
Other Borrowings	2,000,000
Junior subordinated debentures	12,557,000		12,528,000
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount [Member]
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	243,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	42,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets [Abstract]
Cash and due from banks	55,474,000		51,236,000
Federal funds sold	493,000		494,000
Available-for-sale securities	54,000		55,000
Held-to-maturity Securities, Fair Value	0		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
Other Borrowings	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	403,303,000		377,437,000
Held-to-maturity Securities, Fair Value	49,977,000		53,937,000
Loans held for sale	868,000		1,958,000
Loans net of allowance for loan losses	0		0
Interest receivable	6,009,000		6,828,000
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	1,077,860,000		1,053,800,000
Securities sold under agreements to repurchase	116,604,000		121,870,000
Interest payable	305,000		285,000
Federal Home Loan Bank borrowings	25,797,000		20,541,000
Other Borrowings	2,000,000
Junior subordinated debentures	12,557,000		12,528,000
Significant Unobservable Inputs (Level 3)
Financial Assets [Abstract]
Cash and due from banks	0		0
Federal funds sold	0		0
Available-for-sale securities	2,166,000		364,000
Held-to-maturity Securities, Fair Value	0		0
Loans held for sale	0		0
Loans net of allowance for loan losses	1,046,266,000		1,051,110,000
Interest receivable	0		0
Federal Reserve Bank stock	0		0
Federal Home Loan Bank stock	0		0
Financial Liabilities [Abstract]
Deposits	201,592,000		218,558,000
Securities sold under agreements to repurchase	0		0
Interest payable	0		0
Federal Home Loan Bank borrowings	0		0
Other Borrowings	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)	11.20%		11.60%
Constant prepayment rate (in hundredths)	1.30%	[1]	1.30%	[1]
Cumulative projected prepayments (in hundredths)	24.40%		24.40%
Probability of default (in hundredths)	0.10%		0.10%
Loss severity (in hundredths)	97.50%		97.40%
Projected cures given deferral (in hundredths)	100.00%		100.00%
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	583,000		1,313,000
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	583,000		1,313,000
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	42,000
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
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
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%
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%
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 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	42,000

[1] Every five years