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Impaired Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 2,877 |  | $ 2,877 |  | $ 2,703
Unpaid Principal Balance | 3,449 |  | 3,449 |  | 3,136
Average Recorded Investment | 2,777 | 1,442 | 2,814 | 1,585 |
Interest Income Recognized | 2 | 17 | 5 | 30 |
Interest Recognized-Cash Method | 1 | 15 | 4 | 20 |
Recorded Investment | 5,115 |  | 5,115 |  | 4,698
Unpaid Principal Balance | 5,380 |  | 5,380 |  | 5,189
Related Allowance | 1,651 |  | 1,651 |  | 1,658
Average Recorded Investment | 4,966 | 5,731 | 4,741 | 5,852 |
Interest Income Recognized | 0 | 5 | 0 | 0 |
Interest Recognized-Cash Method | 1 | 0 | 1 | 36 |
Recorded Investment | 7,992 |  | 7,992 |  | 7,401
Unpaid Principal Balance | 8,829 |  | 8,829 |  | 8,325
Related Allowance | 1,651 |  | 1,651 |  | 1,658
Average Recorded Investment | 7,743 | 7,173 | 7,555 | 7,437 |
Interest Income Recognized | 2 | 22 | 5 | 30 |
Interest Recognized-Cash Method | 2 | 15 | 5 | 56 |
Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,259 |  | 1,259 |  |
Unpaid Principal Balance | 1,531 |  | 1,531 |  |
Average Recorded Investment | 1,152 | 820 | 1,203 | 936 |
Interest Income Recognized | 1 | 3 | 2 | 13 |
Interest Recognized-Cash Method | 1 | 2 | 2 | 5 |
Recorded Investment | 1,439 |  | 1,439 |  |
Unpaid Principal Balance | 1,524 |  | 1,524 |  |
Related Allowance | 267 |  | 267 |  |
Average Recorded Investment | 1,382 | 2,481 | 1,151 | 2,260 |
Interest Income Recognized | 0 | 5 | 0 | 0 |
Interest Recognized-Cash Method | 1 | 0 | 1 | 36 |
Recorded Investment | 2,698 |  | 2,698 |  |
Unpaid Principal Balance | 3,055 |  | 3,055 |  |
Related Allowance | 267 |  | 267 |  |
Average Recorded Investment | 2,534 | 3,301 | 2,354 | 3,196 |
Interest Income Recognized | 1 | 8 | 2 | 13 |
Interest Recognized-Cash Method | 2 | 2 | 3 | 41 |
Land |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 4 |  | 4 |  | 5
Unpaid Principal Balance | 5 |  | 5 |  | 6
Average Recorded Investment | 23 | 6 | 23 | 5 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 3 | 1 | 3 |
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 | 4 |  | 4 |  | 5
Unpaid Principal Balance | 5 |  | 5 |  | 6
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 23 | 6 | 23 | 5 |
Interest Income Recognized | 0 | 1 | 0 | 1 |
Interest Recognized-Cash Method | 0 | 3 | 1 | 3 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 394 |  | 394 |  |
Unpaid Principal Balance | 402 |  | 402 |  |
Average Recorded Investment | 330 | 331 | 293 | 264 |
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 | 70 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 394 |  | 394 |  |
Unpaid Principal Balance | 402 |  | 402 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 330 | 331 | 293 | 334 |
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 | 1,220 |  | 1,220 |  |
Unpaid Principal Balance | 1,511 |  | 1,511 |  |
Average Recorded Investment | 1,229 | 241 | 1,231 | 339 |
Interest Income Recognized | 0 | 9 | 0 | 9 |
Interest Recognized-Cash Method | 0 | 9 | 0 | 9 |
Recorded Investment | 1,766 |  | 1,766 |  |
Unpaid Principal Balance | 1,845 |  | 1,845 |  |
Related Allowance | 441 |  | 441 |  |
Average Recorded Investment | 1,630 | 1,004 | 1,602 | 1,101 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 2,986 |  | 2,986 |  |
Unpaid Principal Balance | 3,356 |  | 3,356 |  |
Related Allowance | 441 |  | 441 |  |
Average Recorded Investment | 2,859 | 1,245 | 2,833 | 1,440 |
Interest Income Recognized | 0 | 9 | 0 | 9 |
Interest Recognized-Cash Method | 0 | 9 | 0 | 9 |
Commercial Business |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 25 | 0 | 17 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,809 |  | 1,809 |  |
Unpaid Principal Balance | 1,909 |  | 1,909 |  |
Related Allowance | 914 |  | 914 |  |
Average Recorded Investment | 1,826 | 1,981 | 1,877 | 2,063 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 1,809 |  | 1,809 |  |
Unpaid Principal Balance | 1,909 |  | 1,909 |  |
Related Allowance | 914 |  | 914 |  |
Average Recorded Investment | 1,826 | 2,006 | 1,877 | 2,080 |
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 | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Average Recorded Investment | 43 | 16 | 64 | 18 |
Interest Income Recognized | 0 | 2 | 2 | 4 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 2 |
Recorded Investment | 101 |  | 101 |  |
Unpaid Principal Balance | 102 |  | 102 |  |
Related Allowance | 29 |  | 29 |  |
Average Recorded Investment | 128 | 265 | 111 | 352 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 0 |
Recorded Investment | 101 |  | 101 |  |
Unpaid Principal Balance | 102 |  | 102 |  |
Related Allowance | 29 |  | 29 |  |
Average Recorded Investment | 171 | 281 | 175 | 370 |
Interest Income Recognized | 0 | 2 | 2 | 4 |
Interest Recognized-Cash Method | 0 | 1 | 1 | 2 |
Other Consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 3 | 0 | 6 |
Interest Income Recognized | 1 | 2 | 1 | 3 |
Interest Recognized-Cash Method | 0 | 0 | 0 | 1 |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 0 | 0 | 0 | 6 |
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 | 3 | 0 | 12 |
Interest Income Recognized | 1 | 2 | 1 | 3 |
Interest Recognized-Cash Method | 0 | 0 | 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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