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Loans - Individually Evaluated For Impairment By Class of Loans (Detail) (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
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Total impaired loans | $ 14,404 |  | $ 14,404 |  | $ 15,393
Impaired Financing Receivable, Recorded Investment, Total | 11,560 |  | 11,560 |  | 12,131
Impaired Financing Receivable Allocated Loans and Leases | 1,493 |  | 1,493 |  | 897
Impaired Financing Receivable, Average Recorded Investment, Total | 11,676 | 10,926 | 12,425 | 9,647 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 122 | 88 | 299 | 109 |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 6,438 |  | 6,438 |  | 4,890
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,271 |  | 6,271 |  | 4,752
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 1,493 |  | 1,493 |  | 897
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,285 | 4,522 | 6,361 | 6,780 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 122 | 39 | 299 | 39 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,966 |  | 7,966 |  | 10,503
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,289 |  | 5,289 |  | 7,379
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,391 | 6,404 | 6,064 | 2,867 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 49 | 0 | 70 |
Originated for portfolio [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 135
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 135
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |  |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 135 |  | 136 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 669 |  | 669 |  | 796
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 669 |  | 669 |  | 774
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 564 |  | 564 |  | 624
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 672 | 515 | 686 | 1,163 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 8 | 8 | 30 | 8 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 143 |  | 143 |  | 573
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 128 |  | 128 |  | 47
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 130 | 1,248 | 137 | 515 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 7 | 0 | 7 |
Multi-family residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,117 |  | 2,117 |  | 94
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,995 |  | 1,995 |  | 94
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 585 |  | 585 |  | 11
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,996 | 2,278 | 2,002 | 3,048 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 61 |  | 103 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,934 |  | 2,934 |  | 6,742
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,029 |  | 2,029 |  | 4,996
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,032 | 787 | 2,170 | 262 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 1 | 0 | 1 |
Commercial [Member] | Non-owner occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,662 |  | 2,662 |  | 2,823
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,662 |  | 2,662 |  | 2,823
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 274 |  | 274 |  | 210
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 2,670 | 1,379 | 2,684 | 1,752 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 40 | 31 | 127 | 31 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,645 |  | 2,645 |  | 2,177
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,839 |  | 1,839 |  | 1,755
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,869 | 2,236 | 2,357 | 796 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 9 | 0 | 9 |
Commercial [Member] | Owner occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 401 |  | 401 |  | 411
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 401 |  | 401 |  | 411
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 7 |  | 7 |  | 20
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 402 | 350 | 406 | 817 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 6 |  | 19 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,244 |  | 2,244 |  | 876
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,293 |  | 1,293 |  | 446
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,360 | 1,314 | 1,400 | 438 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 21 | 0 | 21 |
Commercial [Member] | Land [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 460 |  | 460 |  | 766
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 415 |  | 415 |  | 650
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 16 |  | 16 |  | 32
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 416 |  | 452 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 6 |  | 19 |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |  |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 684 |  | 688 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 11 |  | 32 |
Single-family residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 129 |  | 129 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 129 |  | 129 |  |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 47 |  | 47 |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 129 |  | 131 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1 |  | 1 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 0
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |  |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 0 |  | 32 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | $ 0 |  |  |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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