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Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 3,341 |  | $ 3,341 |  | $ 3,791
Unpaid Principal Balance | 3,691 |  | 3,691 |  | 4,120
Average Recorded Investment | 3,382 | 1,988 | 3,518 | 2,487 |
Interest Income Recognized | 25 | 7 | 53 | 11 |
Interest Recognized-Cash Method | 28 | 4 | 58 | 5 |
Recorded Investment | 2,849 |  | 2,849 |  | 3,129
Unpaid Principal Balance | 3,242 |  | 3,242 |  | 3,466
Related Allowance | 1,394 |  | 1,394 |  | 1,529
Average Recorded Investment | 3,304 | 3,614 | 3,245 | 3,774 |
Interest Income Recognized | 0 | 0 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 6,190 |  | 6,190 |  | 6,920
Unpaid Principal Balance | 6,933 |  | 6,933 |  | 7,586
Related Allowance | 1,394 |  | 1,394 |  | 1,529
Average Recorded Investment | 6,686 | 5,602 | 6,763 | 6,261 |
Interest Income Recognized | 25 | 7 | 53 | 12 |
Interest Recognized-Cash Method | 28 | 4 | 58 | 5 |
Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,184 |  | 1,184 |  | 1,591
Unpaid Principal Balance | 1,462 |  | 1,462 |  | 1,869
Average Recorded Investment | 1,345 | 1,273 | 1,427 | 1,324 |
Interest Income Recognized | 8 | 2 | 18 | 5 |
Interest Recognized-Cash Method | 9 | 0 | 21 | 1 |
Recorded Investment | 262 |  | 262 |  | 449
Unpaid Principal Balance | 302 |  | 302 |  | 487
Related Allowance | 61 |  | 61 |  | 112
Average Recorded Investment | 436 | 625 | 440 | 731 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,446 |  | 1,446 |  | 2,040
Unpaid Principal Balance | 1,764 |  | 1,764 |  | 2,356
Related Allowance | 61 |  | 61 |  | 112
Average Recorded Investment | 1,781 | 1,898 | 1,867 | 2,055 |
Interest Income Recognized | 8 | 2 | 18 | 5 |
Interest Recognized-Cash Method | 9 | 0 | 21 | 1 |
Land |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 113 |  | 113 |  | 120
Unpaid Principal Balance | 129 |  | 129 |  | 131
Average Recorded Investment | 119 | 126 | 119 | 125 |
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 | 3 | 2 | 2 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 113 |  | 113 |  | 120
Unpaid Principal Balance | 129 |  | 129 |  | 131
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 122 | 129 | 121 | 127 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0 |  | 0
Average Recorded Investment | 130 | 232 | 87 | 289 |
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 | 130 | 232 | 87 | 289 |
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 | 1,760 |  | 1,760 |  | 1,637
Unpaid Principal Balance | 1,781 |  | 1,781 |  | 1,643
Average Recorded Investment | 1,525 | 106 | 1,562 | 582 |
Interest Income Recognized | 17 | 0 | 34 | 0 |
Interest Recognized-Cash Method | 19 | 0 | 36 | 0 |
Recorded Investment | 911 |  | 911 |  | 949
Unpaid Principal Balance | 1,031 |  | 1,031 |  | 1,048
Related Allowance | 107 |  | 107 |  | 145
Average Recorded Investment | 1,123 | 1,161 | 1,065 | 1,208 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 2,671 |  | 2,671 |  | 2,586
Unpaid Principal Balance | 2,812 |  | 2,812 |  | 2,691
Related Allowance | 107 |  | 107 |  | 145
Average Recorded Investment | 2,648 | 1,267 | 2,627 | 1,790 |
Interest Income Recognized | 17 | 0 | 34 | 0 |
Interest Recognized-Cash Method | 19 | 0 | 36 | 0 |
Commercial Business |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 188 |  | 188 |  | 189
Unpaid Principal Balance | 209 |  | 209 |  | 209
Average Recorded Investment | 94 | 0 | 126 | 0 |
Interest Income Recognized | 0 | 4 | 0 | 4 |
Interest Recognized-Cash Method | 0 | 3 | 0 | 3 |
Recorded Investment | 1,676 |  | 1,676 |  | 1,709
Unpaid Principal Balance | 1,909 |  | 1,909 |  | 1,909
Related Allowance | 1,226 |  | 1,226 |  | 1,259
Average Recorded Investment | 1,726 | 1,776 | 1,720 | 1,776 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,864 |  | 1,864 |  | 1,898
Unpaid Principal Balance | 2,118 |  | 2,118 |  | 2,118
Related Allowance | 1,226 |  | 1,226 |  | 1,259
Average Recorded Investment | 1,820 | 1,776 | 1,846 | 1,776 |
Interest Income Recognized | 0 | 4 | 0 | 4 |
Interest Recognized-Cash Method | 0 | 3 | 0 | 3 |
Home Equity and Second Mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 96 |  | 96 |  | 254
Unpaid Principal Balance | 110 |  | 110 |  | 268
Average Recorded Investment | 169 | 251 | 197 | 167 |
Interest Income Recognized | 0 | 1 | 1 | 2 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 1 |
Recorded Investment | 0 |  | 0 |  | 22
Unpaid Principal Balance | 0 |  | 0 |  | 22
Related Allowance | 0 |  | 0 |  | 13
Average Recorded Investment | 16 | 49 | 18 | 57 |
Interest Income Recognized | 0 | 0 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 96 |  | 96 |  | 276
Unpaid Principal Balance | 110 |  | 110 |  | 290
Related Allowance | 0 |  | 0 |  | 13
Average Recorded Investment | 185 | 300 | 215 | 224 |
Interest Income Recognized | 0 | 1 | 1 | 3 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 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 | 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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