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Loans - Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | $ 7,332 | $ 10,503 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,439 | 7,379 |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,803 | 7,189 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,792 | 15,393 |
Average of individually impaired loans during the year |  |  | 11,722
Impaired Financing Receivable, Recorded Investment, Total | 9,854 | 12,131 |
Interest income recognized during impairment |  |  | 41
Impaired Financing Receivable, Allocated Loans and Leases | 830 | 897 |
Impaired Financing Receivable, Average Recorded Investment, Total | 12,008 | 9,879 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 76 | 203 |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 4,460 | 4,890 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 4,415 | 4,752 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 830 | 897 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,205 | 2,690 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 76 | 203 |
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 |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 136 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Other [Member] | Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 136 | 573 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 121 | 47 |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 503 | 1,171 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 970 | 796 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 970 | 774 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 609 | 624 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 658 | 428 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 5 | 30 |
Single-family residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 23 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 129 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 129 |  |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 71 |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 129 |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 2 |  |
Multi-family residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,001 | 6,748 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,879 | 4,996 |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,223 | 3,396 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 288 | 94 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 288 | 94 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 24 | 11 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,975 | 48 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1 | 3 |
Commercial Real Estate [Member] | Non-owner occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,000 | 2,171 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,195 | 1,755 |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,819 | 1,446 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,239 | 2,823 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,239 | 2,823 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 105 | 210 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 2,650 | 1,322 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 56 | 85 |
Commercial Real Estate [Member] | Owner occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,195 | 876 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,244 | 446 |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,258 | 1,017 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 396 | 411 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 396 | 411 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 7 | 20 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 397 | 211 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 6 | 43 |
Commercial Real Estate [Member] | Land [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 438 | 766 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 393 | 650 |
Impaired Financing Receivable with Related Allowance, Allocated Loans and Leases | 14 | 32 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 396 | 681 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 6 | 42 |
Commercial Real Estate [Member] | Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Home equity lines of credit [Member] | Originated for portfolio [Member] | Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |
Home equity lines of credit [Member] | Purchased for portfolio [Member] | Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Allocated Loans and Leases |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |

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