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Allowance for Loan Losses Risk Ratings by Segment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 372,161	$ 369,639	$ 386,964
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	250,180	251,335	254,708
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	17,090	22,417	30,828
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	89,874	81,183	85,467
Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	15,017	14,704	15,961
Strong 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,919	2,021	2,420
Strong 1 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	19	19	23
Strong 1 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Strong 1 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	259	271	486
Strong 1 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,641	1,731	1,911
Above Average 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	26,410	26,290	31,808
Above Average 2 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	12,288	13,871	19,788
Above Average 2 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	271	1,274	0
Above Average 2 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	6,262	4,084	4,418
Above Average 2 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	7,589	7,061	7,602
Satisfactory 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	58,862	54,831	50,301
Satisfactory 3 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	36,187	34,454	32,903
Satisfactory 3 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,410	2,312	1,396
Satisfactory 3 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	16,846	14,578	12,183
Satisfactory 3 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,419	3,487	3,819
Average 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	148,260	143,077	158,617
Average 4 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	103,957	99,712	105,446
Average 4 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	9,505	12,322	19,130
Average 4 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	32,430	28,618	31,412
Average 4 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,368	2,425	2,629
Watch 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	53,404	64,614	65,683
Watch 5 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	37,703	43,369	42,680
Watch 5 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	22	1,721	3,530
Watch 5 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	15,679	19,524	19,473
Watch 5 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
OAEM 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	32,826	31,681	23,484
OAEM 6 [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	25,057	26,302	18,302
OAEM 6 [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,001	79	538
OAEM 6 [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	4,768	5,300	4,644
OAEM 6 [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	50,039	46,668	53,279
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	34,530	33,153	34,887
Substandard [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,881	4,709	6,234
Substandard [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	13,628	8,806	12,158
Substandard [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	441	457	1,372
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	439	455	679
Doubtful [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Doubtful [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2	2	693
Doubtful [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 0	$ 0	$ 0

X

- Definition

Loans subject to review and validation annually by independent consulting firm as well internal credit review function.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Details

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