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Impaired Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 2,673 |  | $ 2,673 |  | $ 2,703
Unpaid Principal Balance | 3,248 |  | 3,248 |  | 3,136
Average Recorded Investment | 2,838 | 1,849 | 2,792 | 1,731 |
Interest Income Recognized | 1 | 9 | 3 | 13 |
Interest Recognized-Cash Method | 1 | 3 | 2 | 5 |
Recorded Investment | 4,815 |  | 4,815 |  | 4,698
Unpaid Principal Balance | 5,068 |  | 5,068 |  | 5,189
Related Allowance | 1,622 |  | 1,622 |  | 1,658
Average Recorded Investment | 4,575 | 5,734 | 4,615 | 5,966 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 1 | 34 | 1 | 34 |
Recorded Investment | 7,488 |  | 7,488 |  | 7,401
Unpaid Principal Balance | 8,316 |  | 8,316 |  | 8,325
Related Allowance | 1,622 |  | 1,622 |  | 1,658
Average Recorded Investment | 7,413 | 7,583 | 7,407 | 7,697 |
Interest Income Recognized | 1 | 9 | 3 | 13 |
Interest Recognized-Cash Method | 2 | 37 | 3 | 39 |
Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,045 |  | 1,045 |  |
Unpaid Principal Balance | 1,314 |  | 1,314 |  |
Average Recorded Investment | 1,202 | 947 | 1,184 | 977 |
Interest Income Recognized | 0 | 6 | 1 | 10 |
Interest Recognized-Cash Method | 1 | 2 | 1 | 4 |
Recorded Investment | 1,325 |  | 1,325 |  |
Unpaid Principal Balance | 1,410 |  | 1,410 |  |
Related Allowance | 231 |  | 231 |  |
Average Recorded Investment | 1,017 | 2,156 | 1,055 | 2,187 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 34 | 0 | 34 |
Recorded Investment | 2,370 |  | 2,370 |  |
Unpaid Principal Balance | 2,724 |  | 2,724 |  |
Related Allowance | 231 |  | 231 |  |
Average Recorded Investment | 2,219 | 3,103 | 2,239 | 3,164 |
Interest Income Recognized | 0 | 6 | 1 | 10 |
Interest Recognized-Cash Method | 1 | 36 | 1 | 38 |
Land |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 41 |  | 41 |  | 5
Unpaid Principal Balance | 42 |  | 42 |  | 6
Average Recorded Investment | 41 | 6 | 29 | 4 |
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 | 41 |  | 41 |  | 5
Unpaid Principal Balance | 42 |  | 42 |  | 6
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 41 | 6 | 29 | 4 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 265 |  | 265 |  |
Unpaid Principal Balance | 270 |  | 270 |  |
Average Recorded Investment | 266 | 441 | 259 | 294 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 0 | 0 | 93 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 265 |  | 265 |  |
Unpaid Principal Balance | 270 |  | 270 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 266 | 441 | 259 | 387 |
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 | 1,237 |  | 1,237 |  |
Unpaid Principal Balance | 1,530 |  | 1,530 |  |
Average Recorded Investment | 1,244 | 438 | 1,234 | 424 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,493 |  | 1,493 |  |
Unpaid Principal Balance | 1,593 |  | 1,593 |  |
Related Allowance | 348 |  | 348 |  |
Average Recorded Investment | 1,502 | 1,011 | 1,547 | 1,134 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 2,730 |  | 2,730 |  |
Unpaid Principal Balance | 3,123 |  | 3,123 |  |
Related Allowance | 348 |  | 348 |  |
Average Recorded Investment | 2,746 | 1,449 | 2,781 | 1,558 |
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 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 0 | 0 | 7 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,843 |  | 1,843 |  |
Unpaid Principal Balance | 1,909 |  | 1,909 |  |
Related Allowance | 914 |  | 914 |  |
Average Recorded Investment | 1,885 | 2,071 | 1,899 | 2,097 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,843 |  | 1,843 |  |
Unpaid Principal Balance | 1,909 |  | 1,909 |  |
Related Allowance | 914 |  | 914 |  |
Average Recorded Investment | 1,885 | 2,071 | 1,899 | 2,104 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Home Equity and Second Mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 85 |  | 85 |  |
Unpaid Principal Balance | 92 |  | 92 |  |
Average Recorded Investment | 85 | 17 | 86 | 19 |
Interest Income Recognized | 1 | 2 | 2 | 2 |
Interest Recognized-Cash Method | 0 | 0 | 1 | 0 |
Recorded Investment | 154 |  | 154 |  |
Unpaid Principal Balance | 156 |  | 156 |  |
Related Allowance | 129 |  | 129 |  |
Average Recorded Investment | 171 | 484 | 114 | 447 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 1 | 0 | 1 | 0 |
Recorded Investment | 239 |  | 239 |  |
Unpaid Principal Balance | 248 |  | 248 |  |
Related Allowance | 129 |  | 129 |  |
Average Recorded Investment | 256 | 501 | 200 | 466 |
Interest Income Recognized | 1 | 2 | 2 | 2 |
Interest Recognized-Cash Method | 1 | 0 | 2 | 0 |
Other Consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 0 | 0 | 6 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 1 | 0 | 1 |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 12 | 0 | 8 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 12 | 0 | 14 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 1 | 0 | 1 |
Residential Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 1,149
Unpaid Principal Balance |  |  |  |  | 1,507
Recorded Investment |  |  |  |  | 1,132
Unpaid Principal Balance |  |  |  |  | 1,233
Related Allowance |  |  |  |  | 183
Recorded Investment |  |  |  |  | 2,281
Unpaid Principal Balance |  |  |  |  | 2,740
Related Allowance |  |  |  |  | 183
Commercial Real Estate Construction Financing Receivable |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 247
Unpaid Principal Balance |  |  |  |  | 249
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Related Allowance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 247
Unpaid Principal Balance |  |  |  |  | 249
Related Allowance |  |  |  |  | 0
Commercial Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 1,215
Unpaid Principal Balance |  |  |  |  | 1,280
Recorded Investment |  |  |  |  | 1,638
Unpaid Principal Balance |  |  |  |  | 1,933
Related Allowance |  |  |  |  | 539
Recorded Investment |  |  |  |  | 2,853
Unpaid Principal Balance |  |  |  |  | 3,213
Related Allowance |  |  |  |  | 539
Commercial Leases |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 1,928
Unpaid Principal Balance |  |  |  |  | 2,023
Related Allowance |  |  |  |  | 936
Recorded Investment |  |  |  |  | 1,928
Unpaid Principal Balance |  |  |  |  | 2,023
Related Allowance |  |  |  |  | 936
Home Equity Line of Credit |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 87
Unpaid Principal Balance |  |  |  |  | 94
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Related Allowance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 87
Unpaid Principal Balance |  |  |  |  | 94
Related Allowance |  |  |  |  | 0
Other Consumer Loans and Leases |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Related Allowance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 0
Unpaid Principal Balance |  |  |  |  | 0
Related Allowance |  |  |  |  | $ 0

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