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Impaired Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 2,063 |  | $ 3,490
Unpaid Principal Balance | 2,448 |  | 4,243
Average Recorded Investment | 2,778 | 2,853 |
Interest Income Recognized | 3 | 2 |
Interest Recognized-Cash Method | 1 | 1 |
Recorded Investment | 3,757 |  | 4,093
Unpaid Principal Balance | 4,084 |  | 4,396
Related Allowance | 1,497 |  | 1,652
Average Recorded Investment | 3,926 | 4,517 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 1 |
Recorded Investment | 5,820 |  | 7,583
Unpaid Principal Balance | 6,532 |  | 8,639
Related Allowance | 1,497 |  | 1,652
Average Recorded Investment | 6,704 | 7,370 |
Interest Income Recognized | 3 | 2 |
Interest Recognized-Cash Method | 1 | 2 |
Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,365 |  | 1,427
Unpaid Principal Balance | 1,732 |  | 1,760
Average Recorded Investment | 1,396 | 1,254 |
Interest Income Recognized | 2 | 1 |
Interest Recognized-Cash Method | 1 | 1 |
Recorded Investment | 609 |  | 943
Unpaid Principal Balance | 684 |  | 1,020
Related Allowance | 143 |  | 213
Average Recorded Investment | 776 | 921 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 1,974 |  | 2,370
Unpaid Principal Balance | 2,416 |  | 2,780
Related Allowance | 143 |  | 213
Average Recorded Investment | 2,172 | 2,175 |
Interest Income Recognized | 2 | 1 |
Interest Recognized-Cash Method | 1 | 1 |
Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 124 |  | 125
Unpaid Principal Balance | 129 |  | 126
Average Recorded Investment | 125 | 23 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 6 |  | 0
Unpaid Principal Balance | 6 |  | 0
Related Allowance | 6 |  | 0
Average Recorded Investment | 3 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 130 |  | 125
Unpaid Principal Balance | 135 |  | 126
Related Allowance | 6 |  | 0
Average Recorded Investment | 128 | 23 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 260 |  | 403
Unpaid Principal Balance | 272 |  | 413
Average Recorded Investment | 332 | 257 |
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 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 260 |  | 403
Unpaid Principal Balance | 272 |  | 413
Related Allowance | 0 |  | 0
Average Recorded Investment | 332 | 257 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 72 |  | 1,535
Unpaid Principal Balance | 73 |  | 1,944
Average Recorded Investment | 804 | 1,233 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 1,334 |  | 1,301
Unpaid Principal Balance | 1,453 |  | 1,394
Related Allowance | 258 |  | 275
Average Recorded Investment | 1,318 | 1,574 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 1,406 |  | 2,836
Unpaid Principal Balance | 1,526 |  | 3,338
Related Allowance | 258 |  | 275
Average Recorded Investment | 2,122 | 2,807 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Commercial Business |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 1,776 |  | 1,776
Unpaid Principal Balance | 1,909 |  | 1,909
Related Allowance | 1,065 |  | 1,098
Average Recorded Investment | 1,776 | 1,928 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 1,776 |  | 1,776
Unpaid Principal Balance | 1,909 |  | 1,909
Related Allowance | 1,065 |  | 1,098
Average Recorded Investment | 1,776 | 1,928 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 |
Home Equity and Second Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 242 |  | 0
Unpaid Principal Balance | 242 |  | 0
Average Recorded Investment | 121 | 86 |
Interest Income Recognized | 1 | 1 |
Interest Recognized-Cash Method | 0 | 0 |
Recorded Investment | 32 |  | 73
Unpaid Principal Balance | 32 |  | 73
Related Allowance | 25 |  | 66
Average Recorded Investment | 53 | 94 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | 0 | 1 |
Recorded Investment | 274 |  | 73
Unpaid Principal Balance | 274 |  | 73
Related Allowance | 25 |  | 66
Average Recorded Investment | 174 | 180 |
Interest Income Recognized | 1 | 1 |
Interest Recognized-Cash Method | 0 | 1 |
Other Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  | 0
Unpaid Principal Balance | 0 |  | 0
Average Recorded Investment | 0 | 0 |
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 | 0 |
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 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Recognized-Cash Method | $ 0 | $ 0 |

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