Loans, Allowance for loan losses (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Allowance for loan losses [Abstract]
Beginning balance	$ 16,604	$ 15,493
Charge-offs	(5,642)	(12,260)
Recoveries	1,177	739
Provision	4,412	12,632
Ending balance	16,551	16,604
Ending balance: individually evaluated for impairment	3,278	2,539
Ending balance: collectively evaluated for impairment	13,273	14,065
Ending balance	16,551	16,604
Loans [Abstract]
Ending balance	625,782	670,497
Ending balance: individually evaluated for impairment	50,648	44,786
Ending balance: collectively evaluated for impairment	575,134	625,711
Real Estate Loans - Construction and Land Development [Member]
Allowance for loan losses [Abstract]
Beginning balance	7,182	5,774
Charge-offs	(3,045)	(7,164)
Recoveries	522	241
Provision	1,733	8,331
Ending balance	6,392	7,182
Ending balance: individually evaluated for impairment	1,527	1,250
Ending balance: collectively evaluated for impairment	4,865	5,932
Ending balance	6,392	7,182
Loans [Abstract]
Ending balance	80,733	93,812
Ending balance: individually evaluated for impairment	19,734	20,280
Ending balance: collectively evaluated for impairment	60,999	73,532
Real Estate Loans - Single-Family Residential [Member]
Allowance for loan losses [Abstract]
Beginning balance	5,357	6,097
Charge-offs	(1,149)	(2,925)
Recoveries	71	201
Provision	817	1,984
Ending balance	5,096	5,357
Ending balance: individually evaluated for impairment	1,637	1,289
Ending balance: collectively evaluated for impairment	3,459	4,068
Ending balance	5,096	5,357
Loans [Abstract]
Ending balance	249,167	267,051
Ending balance: individually evaluated for impairment	23,770	20,661
Ending balance: collectively evaluated for impairment	225,397	246,390
Real estate loans - Commercial [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,731	1,409
Charge-offs	(547)	(1,271)
Recoveries	374	24
Provision	(21)	1,569
Ending balance	1,537	1,731
Ending balance: individually evaluated for impairment	114	0
Ending balance: collectively evaluated for impairment	1,423	1,731
Ending balance	1,537	1,731
Loans [Abstract]
Ending balance	203,603	214,415
Ending balance: individually evaluated for impairment	6,798	3,845
Ending balance: collectively evaluated for impairment	196,805	210,570
Real estate loans - Multifamily and Farmland [Member]
Allowance for loan losses [Abstract]
Beginning balance	13	17
Charge-offs	0	0
Recoveries	0	0
Provision	0	(4)
Ending balance	13	13
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	13	13
Ending balance	13	13
Loans [Abstract]
Ending balance	4,964	4,793
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	4,964	4,793
Commercial (not secured by real estate) [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,029	1,174
Charge-offs	(498)	(314)
Recoveries	95	121
Provision	(18)	48
Ending balance	608	1,029
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	608	1,029
Ending balance	608	1,029
Loans [Abstract]
Ending balance	60,358	60,646
Ending balance: individually evaluated for impairment	346	0
Ending balance: collectively evaluated for impairment	60,012	60,646
Farm loans (not secured by real estate) [Member]
Allowance for loan losses [Abstract]
Beginning balance	0
Charge-offs	0
Recoveries	0
Provision	0
Ending balance	0
Ending balance: individually evaluated for impairment	0
Ending balance: collectively evaluated for impairment	0
Ending balance	0
Loans [Abstract]
Ending balance	12	0
Ending balance: individually evaluated for impairment	0
Ending balance: collectively evaluated for impairment	12
Consumer and All Other (not secured by real estate) [Member]
Allowance for loan losses [Abstract]
Beginning balance	255	430
Charge-offs	(403)	(586)
Recoveries	115	152
Provision	222	259
Ending balance	189	255
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	189	255
Ending balance	189	255
Loans [Abstract]
Ending balance	26,945	29,780
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	26,945	29,780
Unallocated [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,037	592
Charge-offs	0	0
Recoveries	0	0
Provision	1,679	445
Ending balance	2,716	1,037
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	2,716	1,037
Ending balance	2,716	1,037
Loans [Abstract]
Ending balance	0	0
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0

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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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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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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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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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