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Loans, Allowance for loan losses (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Allowance for loan losses [Abstract]
Beginning balance	$ 16,604	$ 15,493
Charge-offs	(4,376)	(12,260)
Recoveries	760	739
Provision	3,652	12,632
Ending balance	16,640	16,604
Ending balance: individually evaluated for impairment	2,465	2,539
Ending balance: collectively evaluated for impairment	14,175	14,065
Ending balance	16,640	16,604
Loans [Abstract]
Ending balance	642,815	670,497
Ending balance: individually evaluated for impairment	48,564	44,786
Ending balance: collectively evaluated for impairment	594,251	625,711
Real Estate Loans - Construction and Land Development [Member]
Allowance for loan losses [Abstract]
Beginning balance	7,182	5,774
Charge-offs	(2,381)	(7,164)
Recoveries	218	241
Provision	2,626	8,331
Ending balance	7,645	7,182
Ending balance: individually evaluated for impairment	1,101	1,250
Ending balance: collectively evaluated for impairment	6,544	5,932
Ending balance	7,645	7,182
Loans [Abstract]
Ending balance	86,498	93,812
Ending balance: individually evaluated for impairment	19,789	20,280
Ending balance: collectively evaluated for impairment	66,709	73,532
Real Estate Loans - Single-Family Residential [Member]
Allowance for loan losses [Abstract]
Beginning balance	5,357	6,097
Charge-offs	(861)	(2,925)
Recoveries	69	201
Provision	561	1,984
Ending balance	5,126	5,357
Ending balance: individually evaluated for impairment	1,364	1,289
Ending balance: collectively evaluated for impairment	3,762	4,068
Ending balance	5,126	5,357
Loans [Abstract]
Ending balance	255,339	267,051
Ending balance: individually evaluated for impairment	23,452	20,661
Ending balance: collectively evaluated for impairment	231,887	246,390
Real estate loans - Commercial [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,731	1,409
Charge-offs	(523)	(1,271)
Recoveries	374	24
Provision	(66)	1,569
Ending balance	1,516	1,731
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	1,516	1,731
Ending balance	1,516	1,731
Loans [Abstract]
Ending balance	207,245	214,415
Ending balance: individually evaluated for impairment	4,961	3,845
Ending balance: collectively evaluated for impairment	202,284	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	5,285	4,793
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	5,285	4,793
Commercial (not secured by real estate) [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,029	1,174
Charge-offs	(343)	(314)
Recoveries	11	121
Provision	(68)	48
Ending balance	629	1,029
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	629	1,029
Ending balance	629	1,029
Loans [Abstract]
Ending balance	59,416	60,646
Ending balance: individually evaluated for impairment	362	0
Ending balance: collectively evaluated for impairment	59,054	60,646
Consumer and All Other (not secured by real estate) [Member]
Allowance for loan losses [Abstract]
Beginning balance	255	430
Charge-offs	(268)	(586)
Recoveries	88	152
Provision	116	259
Ending balance	191	255
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	191	255
Ending balance	191	255
Loans [Abstract]
Ending balance	29,032	29,780
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	29,032	29,780
Unallocated [Member]
Allowance for loan losses [Abstract]
Beginning balance	1,037	592
Charge-offs	0	0
Recoveries	0	0
Provision	483	445
Ending balance	1,520	1,037
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	1,520	1,037
Ending balance	1,520	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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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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