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Impaired Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 3,490 | $ 2,703
Unpaid Principal Balance | 4,243 | 3,136
Average Recorded Investment | 2,949 | 1,808
Interest Income Recognized | 9 | 0
Interest Recognized-Cash Method | 9 | 39
Recorded Investment | 4,093 | 4,698
Unpaid Principal Balance | 4,396 | 5,189
Related Allowance | 1,652 | 1,658
Average Recorded Investment | 4,612 | 5,622
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 9
Recorded Investment | 7,583 | 7,401
Unpaid Principal Balance | 8,639 | 8,325
Related Allowance | 1,652 | 1,658
Average Recorded Investment | 7,561 | 7,430
Interest Income Recognized | 9 | 0
Interest Recognized-Cash Method | 9 | 48
Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,427 | 1,149
Unpaid Principal Balance | 1,760 | 1,507
Average Recorded Investment | 1,248 | 978
Interest Income Recognized | 6 | 0
Interest Recognized-Cash Method | 4 | 29
Recorded Investment | 943 | 1,132
Unpaid Principal Balance | 1,020 | 1,233
Related Allowance | 213 | 183
Average Recorded Investment | 1,110 | 2,035
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 9
Recorded Investment | 2,370 | 2,281
Unpaid Principal Balance | 2,780 | 2,740
Related Allowance | 213 | 183
Average Recorded Investment | 2,358 | 3,013
Interest Income Recognized | 6 | 0
Interest Recognized-Cash Method | 4 | 38
Land |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 125 | 5
Unpaid Principal Balance | 126 | 6
Average Recorded Investment | 43 | 5
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 2 | 0
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 125 | 5
Unpaid Principal Balance | 126 | 6
Related Allowance | 0 | 0
Average Recorded Investment | 43 | 5
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 2 | 0
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 403 | 247
Unpaid Principal Balance | 413 | 249
Average Recorded Investment | 315 | 261
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 56
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 403 | 247
Unpaid Principal Balance | 413 | 249
Related Allowance | 0 | 0
Average Recorded Investment | 315 | 317
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,535 | 1,215
Unpaid Principal Balance | 1,944 | 1,280
Average Recorded Investment | 1,292 | 514
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 1 | 9
Recorded Investment | 1,301 | 1,638
Unpaid Principal Balance | 1,394 | 1,933
Related Allowance | 275 | 539
Average Recorded Investment | 1,542 | 1,208
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 2,836 | 2,853
Unpaid Principal Balance | 3,338 | 3,213
Related Allowance | 275 | 539
Average Recorded Investment | 2,834 | 1,722
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 1 | 9
Commercial Business |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Average Recorded Investment | 0 | 14
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 1,776 | 1,928
Unpaid Principal Balance | 1,909 | 2,023
Related Allowance | 1,098 | 936
Average Recorded Investment | 1,857 | 2,036
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 1,776 | 1,928
Unpaid Principal Balance | 1,909 | 2,023
Related Allowance | 1,098 | 936
Average Recorded Investment | 1,857 | 2,050
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Home Equity and Second Mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 87
Unpaid Principal Balance | 0 | 94
Average Recorded Investment | 51 | 32
Interest Income Recognized | 2 | 0
Interest Recognized-Cash Method | 2 | 1
Recorded Investment | 73 | 0
Unpaid Principal Balance | 73 | 0
Related Allowance | 66 | 0
Average Recorded Investment | 103 | 282
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 73 | 87
Unpaid Principal Balance | 73 | 94
Related Allowance | 66 | 0
Average Recorded Investment | 154 | 314
Interest Income Recognized | 2 | 0
Interest Recognized-Cash Method | 2 | 1
Other Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Average Recorded Investment | 0 | 4
Interest Income Recognized | 1 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 5
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 9
Interest Income Recognized | 1 | 0
Interest Recognized-Cash Method | $ 0 | $ 0

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