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Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 1,222 |  | $ 1,222 |  | $ 3,490
Unpaid Principal Balance | 1,497 |  | 1,497 |  | 4,243
Average Recorded Investment | 1,567 | 2,777 | 2,173 | 2,814 |
Interest Income Recognized | 6 | 2 | 11 | 5 |
Interest Recognized-Cash Method | 4 | 1 | 6 | 4 |
Recorded Investment | 3,457 |  | 3,457 |  | 4,093
Unpaid Principal Balance | 3,832 |  | 3,832 |  | 4,396
Related Allowance | 1,562 |  | 1,562 |  | 1,652
Average Recorded Investment | 3,464 | 4,966 | 3,695 | 4,741 |
Interest Income Recognized | 0 | 0 | 6 | 0 |
Interest Recognized-Cash Method | 0 | 1 | 3 | 1 |
Recorded Investment | 4,679 |  | 4,679 |  | 7,583
Unpaid Principal Balance | 5,329 |  | 5,329 |  | 8,639
Related Allowance | 1,562 |  | 1,562 |  | 1,652
Average Recorded Investment | 5,031 | 7,743 | 5,868 | 7,555 |
Interest Income Recognized | 6 | 2 | 17 | 5 |
Interest Recognized-Cash Method | 4 | 2 | 9 | 5 |
Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 901 |  | 901 |  | 1,427
Unpaid Principal Balance | 1,160 |  | 1,160 |  | 1,760
Average Recorded Investment | 1,041 | 1,152 | 1,219 | 1,203 |
Interest Income Recognized | 4 | 1 | 8 | 2 |
Interest Recognized-Cash Method | 2 | 1 | 3 | 2 |
Recorded Investment | 479 |  | 479 |  | 943
Unpaid Principal Balance | 589 |  | 589 |  | 1,020
Related Allowance | 95 |  | 95 |  | 213
Average Recorded Investment | 560 | 1,382 | 668 | 1,151 |
Interest Income Recognized | 0 | 0 | 1 | 0 |
Interest Recognized-Cash Method | 0 | 1 | 0 | 1 |
Recorded Investment | 1,380 |  | 1,380 |  | 2,370
Unpaid Principal Balance | 1,749 |  | 1,749 |  | 2,780
Related Allowance | 95 |  | 95 |  | 213
Average Recorded Investment | 1,601 | 2,534 | 1,887 | 2,354 |
Interest Income Recognized | 4 | 1 | 9 | 2 |
Interest Recognized-Cash Method | 2 | 2 | 3 | 3 |
Land |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 123 |  | 123 |  | 125
Unpaid Principal Balance | 132 |  | 132 |  | 126
Average Recorded Investment | 125 | 23 | 125 | 23 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 1 |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 2 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 123 |  | 123 |  | 125
Unpaid Principal Balance | 132 |  | 132 |  | 126
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 125 | 23 | 127 | 23 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 1 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 403
Unpaid Principal Balance | 0 |  | 0 |  | 413
Average Recorded Investment | 102 | 330 | 217 | 293 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  | 403
Unpaid Principal Balance | 0 |  | 0 |  | 413
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 102 | 330 | 217 | 293 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 136 |  | 136 |  | 1,535
Unpaid Principal Balance | 140 |  | 140 |  | 1,944
Average Recorded Investment | 138 | 1,229 | 471 | 1,231 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 966 |  | 966 |  | 1,301
Unpaid Principal Balance | 1,055 |  | 1,055 |  | 1,394
Related Allowance | 144 |  | 144 |  | 275
Average Recorded Investment | 977 | 1,630 | 1,147 | 1,602 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,102 |  | 1,102 |  | 2,836
Unpaid Principal Balance | 1,195 |  | 1,195 |  | 3,338
Related Allowance | 144 |  | 144 |  | 275
Average Recorded Investment | 1,115 | 2,859 | 1,618 | 2,833 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Commercial Business |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,968 |  | 1,968 |  | 1,776
Unpaid Principal Balance | 2,136 |  | 2,136 |  | 1,909
Related Allowance | 1,315 |  | 1,315 |  | 1,098
Average Recorded Investment | 1,872 | 1,826 | 1,824 | 1,877 |
Interest Income Recognized | 0 | 0 | 4 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 3 | 0 |
Recorded Investment | 1,968 |  | 1,968 |  | 1,776
Unpaid Principal Balance | 2,136 |  | 2,136 |  | 1,909
Related Allowance | 1,315 |  | 1,315 |  | 1,098
Average Recorded Investment | 1,872 | 1,826 | 1,824 | 1,877 |
Interest Income Recognized | 0 | 0 | 4 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 3 | 0 |
Home Equity and Second Mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 62 |  | 62 |  | 0
Unpaid Principal Balance | 65 |  | 65 |  | 0
Average Recorded Investment | 161 | 43 | 141 | 64 |
Interest Income Recognized | 2 | 0 | 3 | 2 |
Interest Recognized-Cash Method | 2 | 0 | 3 | 1 |
Recorded Investment | 44 |  | 44 |  | 73
Unpaid Principal Balance | 52 |  | 52 |  | 73
Related Allowance | 8 |  | 8 |  | 66
Average Recorded Investment | 55 | 128 | 54 | 111 |
Interest Income Recognized | 0 | 0 | 1 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 106 |  | 106 |  | 73
Unpaid Principal Balance | 117 |  | 117 |  | 73
Related Allowance | 8 |  | 8 |  | 66
Average Recorded Investment | 216 | 171 | 195 | 175 |
Interest Income Recognized | 2 | 0 | 4 | 2 |
Interest Recognized-Cash Method | 2 | 0 | 3 | 1 |
Other Consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | $ 0 | $ 0 | $ 0 | $ 0 |

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