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Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 3,669 | $ 3,791
Unpaid Principal Balance | 4,273 | 4,120
Average Recorded Investment | 3,731 | 4,194
Interest Income Recognized | 28 | 14
Interest Recognized-Cash Method | 30 | 6
Recorded Investment | 2,918 | 3,129
Unpaid Principal Balance | 3,255 | 3,466
Related Allowance | 1,460 | 1,529
Average Recorded Investment | 3,024 | 3,926
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 6,587 | 6,920
Unpaid Principal Balance | 7,528 | 7,586
Related Allowance | 1,460 | 1,529
Average Recorded Investment | 6,755 | 8,120
Interest Income Recognized | 28 | 14
Interest Recognized-Cash Method | 30 | 6
Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,373 | 1,591
Unpaid Principal Balance | 1,671 | 1,869
Average Recorded Investment | 1,482 | 1,594
Interest Income Recognized | 10 | 4
Interest Recognized-Cash Method | 13 | 3
Recorded Investment | 265 | 449
Unpaid Principal Balance | 293 | 487
Related Allowance | 70 | 112
Average Recorded Investment | 357 | 776
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 1,638 | 2,040
Unpaid Principal Balance | 1,964 | 2,356
Related Allowance | 70 | 112
Average Recorded Investment | 1,839 | 2,370
Interest Income Recognized | 10 | 4
Interest Recognized-Cash Method | 13 | 3
Land |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 118 | 120
Unpaid Principal Balance | 132 | 131
Average Recorded Investment | 119 | 125
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 | 3
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 118 | 120
Unpaid Principal Balance | 132 | 131
Related Allowance | 0 | 0
Average Recorded Investment | 119 | 128
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 0
Unpaid Principal Balance | 0 | 0
Average Recorded Investment | 0 | 332
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 | 332
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,792 | 1,637
Unpaid Principal Balance | 2,053 | 1,643
Average Recorded Investment | 1,715 | 2,022
Interest Income Recognized | 17 | 9
Interest Recognized-Cash Method | 17 | 3
Recorded Investment | 931 | 949
Unpaid Principal Balance | 1,040 | 1,048
Related Allowance | 127 | 145
Average Recorded Investment | 940 | 1,318
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 2,723 | 2,586
Unpaid Principal Balance | 3,093 | 2,691
Related Allowance | 127 | 145
Average Recorded Investment | 2,655 | 3,340
Interest Income Recognized | 17 | 9
Interest Recognized-Cash Method | 17 | 3
Commercial Business |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 189 | 189
Unpaid Principal Balance | 209 | 209
Average Recorded Investment | 189 | 0
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 1,709 | 1,709
Unpaid Principal Balance | 1,909 | 1,909
Related Allowance | 1,259 | 1,259
Average Recorded Investment | 1,709 | 1,776
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 1,898 | 1,898
Unpaid Principal Balance | 2,118 | 2,118
Related Allowance | 1,259 | 1,259
Average Recorded Investment | 1,898 | 1,776
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Home Equity and Second Mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 197 | 254
Unpaid Principal Balance | 208 | 268
Average Recorded Investment | 226 | 121
Interest Income Recognized | 1 | 1
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 13 | 22
Unpaid Principal Balance | 13 | 22
Related Allowance | 4 | 13
Average Recorded Investment | 18 | 53
Interest Income Recognized | 0 | 0
Interest Recognized-Cash Method | 0 | 0
Recorded Investment | 210 | 276
Unpaid Principal Balance | 221 | 290
Related Allowance | 4 | 13
Average Recorded Investment | 244 | 174
Interest Income Recognized | 1 | 1
Interest Recognized-Cash Method | 0 | 0
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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