Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	$ 21,931	$ 21,749	$ 21,257	$ 21,768
Charge-offs	(2,591)	(1,600)	(6,347)	(8,034)
Recoveries	449	538	1,014	1,253
Provision	1,700	2,000	5,565	7,700
Ending Balance	21,489	22,687	21,489	22,687
Individually evaluated for impairment	5,075		5,075		4,811
Collectively evaluated for impairment	16,414		16,414		16,446
Ending Balance	21,489		21,489		21,257
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	30,581		30,581		27,380
Financing Receivable, collectively evaluated for impairment	772,091		772,091		757,888
Ending Balance	802,672		802,672		785,268
Commercial & Agriculture [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	2,537	2,821	2,876	3,639
Charge-offs	(192)	(145)	(610)	(1,053)
Recoveries	180	111	280	284
Provision	44	1,162	23	1,079
Ending Balance	2,569	3,949	2,569	3,949
Individually evaluated for impairment	251		251		618
Collectively evaluated for impairment	2,318		2,318		2,258
Ending Balance	2,569		2,569		2,876
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	5,264		5,264		5,258
Financing Receivable, collectively evaluated for impairment	79,584		79,584		81,137
Ending Balance	84,848		84,848		86,395
Commercial Real Estate [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	11,701	10,713	10,571	9,827
Charge-offs	(824)	(710)	(2,463)	(2,926)
Recoveries	196	166	371	299
Provision	154	284	2,748	3,253
Ending Balance	11,227	10,453	11,227	10,453
Individually evaluated for impairment	3,760		3,760		3,094
Collectively evaluated for impairment	7,467		7,467		7,477
Ending Balance	11,227		11,227		10,571
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	18,150		18,150		17,700
Financing Receivable, collectively evaluated for impairment	387,385		387,385		354,152
Ending Balance	405,535		405,535		371,852
Residential Real Estate [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	6,379	6,184	5,796	4,569
Charge-offs	(1,334)	(703)	(2,803)	(3,126)
Recoveries	47	136	208	245
Provision	867	336	2,758	4,265
Ending Balance	5,959	5,953	5,959	5,953
Individually evaluated for impairment	808		808		860
Collectively evaluated for impairment	5,151		5,151		4,936
Ending Balance	5,959		5,959		5,796
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	6,219		6,219		3,846
Financing Receivable, collectively evaluated for impairment	250,621		250,621		271,149
Ending Balance	256,840		256,840		274,995
Real estate - construction [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	1,095	1,196	974	2,139
Charge-offs	(192)		(297)	(778)
Recoveries	(9)	98	104	348
Provision	171	(83)	284	(498)
Ending Balance	1,065	1,211	1,065	1,211
Individually evaluated for impairment	194		194		239
Collectively evaluated for impairment	871		871		735
Ending Balance	1,065		1,065		974
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	885		885		576
Financing Receivable, collectively evaluated for impairment	44,520		44,520		39,214
Ending Balance	45,405		45,405		39,790
Consumer [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	262	670	719	726
Charge-offs	(49)	(42)	(174)	(151)
Recoveries	35	27	51	77
Provision	5	(21)	(343)	(18)
Ending Balance	253	634	253	634
Individually evaluated for impairment	62		62
Collectively evaluated for impairment	191		191		719
Ending Balance	253		253		719
Loan balances outstanding
Financing Receivable, individually evaluated for impairment	63		63
Financing Receivable, collectively evaluated for impairment	9,981		9,981		12,236
Ending Balance	10,044		10,044		12,236
Unallocated [Member]
Changes in Allowance for Loan Losses and Loan Balances Outstanding
Beginning Balance	(43)	165	321	868
Provision	459	322	95	(381)
Ending Balance	416	487	416	487
Collectively evaluated for impairment	416		416		321
Ending Balance	416		416		321
Loan balances outstanding
Financing Receivable, individually evaluated for impairment
Financing Receivable, collectively evaluated for impairment
Ending Balance

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Loan balances outstanding evaluated for impairment.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount of direct write-downs of receivables charged against the allowance for doubtful accounts.

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Amount of recoveries of receivables doubtful of collection that were previously charged off.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 8, 9

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Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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