Fair Value of Financial Instruments (Details) (USD $)	6 Months Ended			12 Months Ended
	Jun. 30, 2012		Jun. 30, 2011	Dec. 31, 2011
Nonrecurring fair value measurements:
Number of impaired other real estate owned properties	2
Impaired charges related to other real estate owned properties included in non-interest expense for the period	$ 76,000
Carrying value of repossessed asset	23,000			117,000
Proceeds from sale of other real estate owned and repossessed assets	20,000		148,000	148,000
Realized gain (loss) from sale of repossessed assets	(3,000)			31,000
Assets:
Loans, net	463,162,000,000			468,283,000
Investment securities, non-taxable, held-to-maturity	11,474,000			10,734,000
Federal Reserve Bank stock	949,000			940,000
Federal Home Loan Bank stock	2,091,000			2,091,000
Liabilities:
Deposits	715,931,000,000			669,383,000
Long-term debt	21,553,000,000			22,570,000
Financial Liabilities [Abstract]
Deposits	715,931,000,000			669,383,000
Long-term debt	21,553,000,000			22,570,000
Fair Value [Member]
Liabilities:
Deposits	715,931,000,000			669,383,000
Long-term debt	21,553,000,000			22,570,000
Financial Assets [Abstract]
Cash and cash equivalents	26,896,000			19,535,000
Investment securities [Abstract]
Available-for-sale	285,141,000			254,006,000
Held-to-maturity	11,474,000			10,734,000
Federal Reserve Bank Stock	949,000			940,000
Federal Home Loan Bank Stock	2,091,000			2,091,000
Loans, net	465,106,000,000			470,846,000
Financial Liabilities [Abstract]
Deposits	715,931,000,000			669,383,000
Short-term borrowings	13,142,000			21,596,000
Long-term debt	21,553,000,000			22,570,000
Carrying Amount [Member]
Liabilities:
Deposits	710,656,000			663,562,000
Long-term debt	20,391,000			21,373,000
Financial Assets [Abstract]
Cash and cash equivalents	26,896,000			19,535,000
Investment securities [Abstract]
Available-for-sale	285,141,000			254,006,000
Held-to-maturity	11,474,000			10,734,000
Federal Reserve Bank Stock	949,000			940,000
Federal Home Loan Bank Stock	2,091,000			2,091,000
Loans, net	458,629,000			458,331,000
Financial Liabilities [Abstract]
Deposits	710,656,000			663,562,000
Short-term borrowings	13,142,000			21,596,000
Long-term debt	20,391,000			21,373,000
Mutual Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			1,053,000	1,053,000
Purchases			500,000
Dividend reinvested			17,000
Net change in unrealized gains (losses) included in other comprehensive income			11,000
Ending balance			1,581,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Loans, net	0			0
Investment securities, non-taxable, held-to-maturity	0			0
Federal Reserve Bank stock	949,000			940,000
Federal Home Loan Bank stock	2,091,000			2,091,000
Liabilities:
Deposits	0			0
Long-term debt	0			0
Financial Liabilities [Abstract]
Deposits	0			0
Long-term debt	0			0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Loans, net	463,162,000,000			468,283,000
Investment securities, non-taxable, held-to-maturity	0			0
Federal Reserve Bank stock	0			0
Federal Home Loan Bank stock	0			0
Liabilities:
Deposits	715,931,000,000			669,383,000
Long-term debt	21,553,000,000			22,570,000
Financial Liabilities [Abstract]
Deposits	715,931,000,000			669,383,000
Long-term debt	21,553,000,000			22,570,000
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Loans, net	0			0
Investment securities, non-taxable, held-to-maturity	11,474,000			10,734,000
Federal Reserve Bank stock	0			0
Federal Home Loan Bank stock	0			0
Liabilities:
Deposits	0			0
Long-term debt	0			0
Financial Liabilities [Abstract]
Deposits	0			0
Long-term debt	0			0
Fair Value, Measurements, Recurring [Member]
Investment securities available-for-sale:
U.S. Treasury notes	21,169,000			17,550,000
U.S. Agency notes	101,242,000			82,927,000
U.S. Agency mortgage-backed securities	58,297,000			52,287,000
Corporate securities	6,332,000			6,365,000
Municipal securities:
Non-taxable	73,233,000			69,703,000
Taxable	21,178,000			21,907,000
Mutual funds	2,153,000			2,125,000
Trust preferred securities	515,000			564,000
Equity securities	1,022,000			578,000
Total recurring fair value measurements	285,141,000			254,006,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Investment securities available-for-sale:
U.S. Treasury notes	21,169,000			17,550,000
U.S. Agency notes	0			0
U.S. Agency mortgage-backed securities	0			0
Corporate securities	4,140,000			4,152,000
Municipal securities:
Non-taxable	0			0
Taxable	0			0
Mutual funds	0			0
Trust preferred securities	515,000			564,000
Equity securities	1,022,000			578,000
Total recurring fair value measurements	26,846,000			22,844,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale:
U.S. Treasury notes	0			0
U.S. Agency notes	101,242,000			82,927,000
U.S. Agency mortgage-backed securities	58,297,000			52,287,000
Corporate securities	2,192,000			2,213,000
Municipal securities:
Non-taxable	73,233,000			69,703,000
Taxable	21,178,000			21,907,000
Mutual funds	1,153,000			1,125,000
Trust preferred securities	0			0
Equity securities	0			0
Total recurring fair value measurements	257,295,000			230,162,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale:
U.S. Treasury notes	0			0
U.S. Agency notes	0			0
U.S. Agency mortgage-backed securities	0			0
Corporate securities	0			0
Municipal securities:
Non-taxable	0			0
Taxable	0			0
Mutual funds	1,000,000			1,000,000
Trust preferred securities	0			0
Equity securities	0			0
Total recurring fair value measurements	1,000,000			1,000,000
Fair Value, Measurements, Nonrecurring [Member]
Nonrecurring fair value measurements:
Impaired loans	1,944,000			2,563,000
Other real estate owned and repossessed assets	2,123,000	[1],[2]		1,642,000	[3]
Total nonrecurring fair value measurements	4,067,000			4,205,000
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Nonrecurring fair value measurements:
Impaired loans	0			0
Other real estate owned and repossessed assets	0	[1],[2]		0	[3]
Total nonrecurring fair value measurements	0			0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Nonrecurring fair value measurements:
Impaired loans	830,000			1,300,000
Other real estate owned and repossessed assets	2,123,000	[1],[2]		1,619,000	[3]
Total nonrecurring fair value measurements	2,953,000			2,919,000
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Nonrecurring fair value measurements:
Impaired loans	1,114,000			1,263,000
Other real estate owned and repossessed assets	0	[1],[2]		23,000	[3]
Total nonrecurring fair value measurements	1,114,000			1,286,000
Fair Value, Measurements, Nonrecurring [Member] | Total Gains (Losses) [Member]
Nonrecurring fair value measurements:
Impaired loans	0			0
Other real estate owned and repossessed assets	(79,000)	[1],[2]		31,000	[3]
Total nonrecurring fair value measurements	$ (79,000)			$ 31,000

[1] Two other real estate owned properties with a total carrying amount of $1,619,000 were written down to their combined fair value of $1,543,000, resulting in an impairment charge of $76,000, which was included in other non-interest expense for the period.

[2] Repossessed assets with a carrying value of $23,000 were sold for a combined total of $20,000, resulting in a net loss of $3,000, which was included in other non-interest expense for the period.

[3] Repossessed assets with a carrying value of $117,000 were sold for a combined total of $148,000, resulting in a net gain of $31,000, which was included in other non-interest expense for the period.