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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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph e -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 116 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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