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Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 1,910 |  | $ 1,910 |  | $ 3,490
Unpaid Principal Balance | 2,207 |  | 2,207 |  | 4,243
Average Recorded Investment | 1,988 | 2,838 | 2,487 | 2,792 |
Interest Income Recognized | 7 | 1 | 11 | 3 |
Interest Recognized-Cash Method | 4 | 1 | 5 | 2 |
Recorded Investment | 3,469 |  | 3,469 |  | 4,093
Unpaid Principal Balance | 3,828 |  | 3,828 |  | 4,396
Related Allowance | 1,347 |  | 1,347 |  | 1,652
Average Recorded Investment | 3,614 | 4,575 | 3,774 | 4,615 |
Interest Income Recognized | 0 | 0 | 1 | 0 |
Interest Recognized-Cash Method | 0 | 1 | 0 | 1 |
Recorded Investment | 5,379 |  | 5,379 |  | 7,583
Unpaid Principal Balance | 6,035 |  | 6,035 |  | 8,639
Related Allowance | 1,347 |  | 1,347 |  | 1,652
Average Recorded Investment | 5,602 | 7,413 | 6,261 | 7,407 |
Interest Income Recognized | 7 | 1 | 12 | 3 |
Interest Recognized-Cash Method | 4 | 2 | 5 | 3 |
Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,181 |  | 1,181 |  | 1,427
Unpaid Principal Balance | 1,453 |  | 1,453 |  | 1,760
Average Recorded Investment | 1,273 | 1,202 | 1,324 | 1,184 |
Interest Income Recognized | 2 | 0 | 5 | 1 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 1 |
Recorded Investment | 640 |  | 640 |  | 943
Unpaid Principal Balance | 790 |  | 790 |  | 1,020
Related Allowance | 93 |  | 93 |  | 213
Average Recorded Investment | 625 | 1,017 | 731 | 1,055 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,821 |  | 1,821 |  | 2,370
Unpaid Principal Balance | 2,243 |  | 2,243 |  | 2,780
Related Allowance | 93 |  | 93 |  | 213
Average Recorded Investment | 1,898 | 2,219 | 2,055 | 2,239 |
Interest Income Recognized | 2 | 0 | 5 | 1 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 1 |
Land |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 127 |  | 127 |  | 125
Unpaid Principal Balance | 134 |  | 134 |  | 126
Average Recorded Investment | 126 | 41 | 125 | 29 |
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 | 3 | 0 | 2 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 127 |  | 127 |  | 125
Unpaid Principal Balance | 134 |  | 134 |  | 126
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 129 | 41 | 127 | 29 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 203 |  | 203 |  | 403
Unpaid Principal Balance | 217 |  | 217 |  | 413
Average Recorded Investment | 232 | 266 | 289 | 259 |
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 | 203 |  | 203 |  | 403
Unpaid Principal Balance | 217 |  | 217 |  | 413
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 232 | 266 | 289 | 259 |
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 | 139 |  | 139 |  | 1,535
Unpaid Principal Balance | 141 |  | 141 |  | 1,944
Average Recorded Investment | 106 | 1,244 | 582 | 1,234 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 988 |  | 988 |  | 1,301
Unpaid Principal Balance | 1,063 |  | 1,063 |  | 1,394
Related Allowance | 164 |  | 164 |  | 275
Average Recorded Investment | 1,161 | 1,502 | 1,208 | 1,547 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,127 |  | 1,127 |  | 2,836
Unpaid Principal Balance | 1,204 |  | 1,204 |  | 3,338
Related Allowance | 164 |  | 164 |  | 275
Average Recorded Investment | 1,267 | 2,746 | 1,790 | 2,781 |
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 | 4 | 0 | 4 | 0 |
Interest Recognized-Cash Method | 3 | 0 | 3 | 0 |
Recorded Investment | 1,776 |  | 1,776 |  | 1,776
Unpaid Principal Balance | 1,909 |  | 1,909 |  | 1,909
Related Allowance | 1,065 |  | 1,065 |  | 1,098
Average Recorded Investment | 1,776 | 1,885 | 1,776 | 1,899 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,776 |  | 1,776 |  | 1,776
Unpaid Principal Balance | 1,909 |  | 1,909 |  | 1,909
Related Allowance | 1,065 |  | 1,065 |  | 1,098
Average Recorded Investment | 1,776 | 1,885 | 1,776 | 1,899 |
Interest Income Recognized | 4 | 0 | 4 | 0 |
Interest Recognized-Cash Method | 3 | 0 | 3 | 0 |
Home Equity and Second Mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 260 |  | 260 |  | 0
Unpaid Principal Balance | 262 |  | 262 |  | 0
Average Recorded Investment | 251 | 85 | 167 | 86 |
Interest Income Recognized | 1 | 1 | 2 | 2 |
Interest Recognized-Cash Method | 1 | 0 | 1 | 1 |
Recorded Investment | 65 |  | 65 |  | 73
Unpaid Principal Balance | 66 |  | 66 |  | 73
Related Allowance | 25 |  | 25 |  | 66
Average Recorded Investment | 49 | 171 | 57 | 114 |
Interest Income Recognized | 0 | 0 | 1 | 0 |
Interest Recognized-Cash Method | 0 | 1 | 0 | 1 |
Recorded Investment | 325 |  | 325 |  | 73
Unpaid Principal Balance | 328 |  | 328 |  | 73
Related Allowance | 25 |  | 25 |  | 66
Average Recorded Investment | 300 | 256 | 224 | 200 |
Interest Income Recognized | 1 | 1 | 3 | 2 |
Interest Recognized-Cash Method | 1 | 1 | 1 | 2 |
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 | 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 |  | 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 |

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