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Loans - Aging of Recorded Investment In Past Due Loans By Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | $ 556 | $ 1,012
60 - 89 Days Past Due | 818 | 779
Greater than 90 Days Past Due | 3,839 | 3,768
Total Past Due | 5,213 | 5,559
Loans Not Past Due | 123,599 | 151,711
Nonaccrual Loans Not > 90 Days Past Due | 7,927 | 8,301
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | 21 | 103
60 - 89 Days Past Due | 112 | 0
Greater than 90 Days Past Due | 120 | 0
Total Past Due | 253 | 103
Loans Not Past Due | 17,934 | 25,891
Nonaccrual Loans Not > 90 Days Past Due | 667 | 47
Single-family residential [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | 302 | 714
60 - 89 Days Past Due | 706 | 474
Greater than 90 Days Past Due |  | 491
Total Past Due | 1,008 | 1,679
Loans Not Past Due | 14,417 | 16,535
Nonaccrual Loans Not > 90 Days Past Due | 44 | 736
Multi-family residential [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Greater than 90 Days Past Due | 2,029 | 3,065
Total Past Due | 2,029 | 3,065
Loans Not Past Due | 20,871 | 24,098
Nonaccrual Loans Not > 90 Days Past Due | 3,937 | 4,996
Other consumer [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | 61 |
60 - 89 Days Past Due |  | 30
Total Past Due | 61 | 30
Loans Not Past Due | 977 | 1,191
Non-owner occupied [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | 42 | 173
60 - 89 Days Past Due |  | 275
Greater than 90 Days Past Due | 1,243 | 68
Total Past Due | 1,285 | 516
Loans Not Past Due | 29,507 | 35,899
Nonaccrual Loans Not > 90 Days Past Due | 1,839 | 1,910
Owner occupied [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Greater than 90 Days Past Due | 300 |
Total Past Due | 300 |
Loans Not Past Due | 22,386 | 27,900
Nonaccrual Loans Not > 90 Days Past Due | 1,293 | 446
Land [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 4,639 | 5,442
Originated for portfolio [Member] | Home equity lines of credit [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due |  | 22
Greater than 90 Days Past Due | 66 | 135
Total Past Due | 66 | 157
Loans Not Past Due | 10,734 | 12,126
Nonaccrual Loans Not > 90 Days Past Due | 66 | 157
Purchased for portfolio [Member] | Home equity lines of credit [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30 - 59 Days Past Due | 130 |
Greater than 90 Days Past Due | 81 | 9
Total Past Due | 211 | 9
Loans Not Past Due | 2,134 | 2,629
Nonaccrual Loans Not > 90 Days Past Due | $ 81 | $ 9

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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