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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 10,320 | $ 2,292 | $ 10,320 | $ 2,292 | $ 18,568
Unpaid Principal Balance, With no related allowance, Total | 13,030 | 2,292 | 13,030 | 2,292 | 26,353
Average Recorded Investment, With no related allowance, Total | 12,844 | 2,012 | 14,868 | 1,794 | 18,628
Recorded Investment, With an allowance recorded, Total | 6,441 | 4,087 | 6,441 | 4,087 | 4,378
Interest Income Recognized, With no related allowance, Total | 40 |  | 132 |  |
Unpaid Principal Balance, With an allowance recorded, Total | 6,441 | 4,087 | 6,441 | 4,087 | 4,378
Related Allowance, With an allowance recorded, Total | 2,115 | 1,959 | 2,115 | 1,959 | 2,024
Average Recorded Investment, With an allowance recorded, Total | 4,922 | 4,994 | 4,072 | 3,818 | 4,263
Interest Income Recognized, With an allowance recorded, Total | 38 | 93 | 110 | 149 | 184
Recorded Investment, Total | 16,761 | 6,379 | 16,761 | 6,379 | 22,946
Unpaid Principal Balance, Total | 19,471 | 6,379 | 19,471 | 6,379 | 30,731
Related Allowance, With an allowance recorded, Total | 2,115 | 1,959 | 2,115 | 1,959 | 2,024
Average Recorded Investment, Total | 17,766 | 7,006 | 18,940 | 5,612 | 22,891
Interest Income Recognized, Total | 78 | 93 | 242 | 149 | 184
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,352 | 305 | 2,352 | 305 | 4,978
Unpaid Principal Balance, With no related allowance, Total | 4,076 | 305 | 4,076 | 305 | 9,474
Average Recorded Investment, With no related allowance, Total | 2,501 | 82 | 2,771 | 213 | 5,824
Recorded Investment, With an allowance recorded, Total | 1,781 | 2,064 | 1,781 | 2,064 | 2,200
Interest Income Recognized, With no related allowance, Total | 19 |  | 71 |  |
Unpaid Principal Balance, With an allowance recorded, Total | 1,781 | 2,064 | 1,781 | 2,064 | 2,200
Related Allowance, With an allowance recorded, Total | 1,163 | 1,464 | 1,163 | 1,464 | 1,500
Average Recorded Investment, With an allowance recorded, Total | 1,769 | 3,226 | 1,825 | 1,440 | 2,182
Interest Income Recognized, With an allowance recorded, Total | 20 | 70 | 63 | 82 | 95
Recorded Investment, Total | 4,133 | 2,369 | 4,133 | 2,369 | 7,178
Unpaid Principal Balance, Total | 5,857 | 2,369 | 5,857 | 2,369 | 11,674
Related Allowance, With an allowance recorded, Total | 1,163 | 1,464 | 1,163 | 1,464 | 1,500
Average Recorded Investment, Total | 4,270 | 3,308 | 4,596 | 1,653 | 8,006
Interest Income Recognized, Total | 39 | 70 | 134 | 82 | 95
Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 5,275 | 267 | 5,275 | 267 | 10,496
Unpaid Principal Balance, With no related allowance, Total | 6,074 | 267 | 6,074 | 267 | 13,352
Average Recorded Investment, With no related allowance, Total | 7,587 | 293 | 9,238 | 289 | 10,095
Recorded Investment, With an allowance recorded, Total | 3,893 | 1,424 | 3,893 | 1,424 | 1,394
Interest Income Recognized, With no related allowance, Total | 20 |  | 58 |  |
Unpaid Principal Balance, With an allowance recorded, Total | 3,893 | 1,424 | 3,893 | 1,424 | 1,394
Related Allowance, With an allowance recorded, Total | 660 | 300 | 660 | 300 | 300
Average Recorded Investment, With an allowance recorded, Total | 2,640 | 1,396 | 1,816 | 1,435 | 1,409
Interest Income Recognized, With an allowance recorded, Total | 14 | 19 | 43 | 57 | 76
Recorded Investment, Total | 9,168 | 1,691 | 9,168 | 1,691 | 11,890
Unpaid Principal Balance, Total | 9,967 | 1,691 | 9,967 | 1,691 | 14,746
Related Allowance, With an allowance recorded, Total | 660 | 300 | 660 | 300 | 300
Average Recorded Investment, Total | 10,227 | 1,689 | 11,054 | 1,724 | 11,504
Interest Income Recognized, Total | 34 | 19 | 101 | 57 | 76
Real Estate Residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,629 | 1,621 | 2,629 | 1,621 | 3,004
Unpaid Principal Balance, With no related allowance, Total | 2,816 | 1,621 | 2,816 | 1,621 | 3,437
Average Recorded Investment, With no related allowance, Total | 2,675 | 1,552 | 2,758 | 1,217 | 2,614
Recorded Investment, With an allowance recorded, Total | 750 | 599 | 750 | 599 | 784
Interest Income Recognized, With no related allowance, Total | 1 |  | 3 |  |
Unpaid Principal Balance, With an allowance recorded, Total | 750 | 599 | 750 | 599 | 784
Related Allowance, With an allowance recorded, Total | 275 | 195 | 275 | 195 | 224
Average Recorded Investment, With an allowance recorded, Total | 504 | 372 | 428 | 943 | 672
Interest Income Recognized, With an allowance recorded, Total | 4 | 4 | 4 | 10 | 13
Recorded Investment, Total | 3,379 | 2,220 | 3,379 | 2,220 | 3,788
Unpaid Principal Balance, Total | 3,566 | 2,220 | 3,566 | 2,220 | 4,221
Related Allowance, With an allowance recorded, Total | 275 | 195 | 275 | 195 | 224
Average Recorded Investment, Total | 3,179 | 1,924 | 3,186 | 2,160 | 3,286
Interest Income Recognized, Total | 5 | 4 | 7 | 10 | 13
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 64 | 99 | 64 | 99 | 90
Unpaid Principal Balance, With no related allowance, Total | 64 | 99 | 64 | 99 | 90
Average Recorded Investment, With no related allowance, Total | 81 | 85 | 101 | 75 | 95
Recorded Investment, With an allowance recorded, Total | 17 |  | 17 |  |
Interest Income Recognized, With no related allowance, Total |  |  |  |  |
Unpaid Principal Balance, With an allowance recorded, Total | 17 |  | 17 |  |
Related Allowance, With an allowance recorded, Total | 17 |  | 17 |  |
Average Recorded Investment, With an allowance recorded, Total | 9 |  | 3 |  |
Interest Income Recognized, With an allowance recorded, Total |  |  |  |  |
Recorded Investment, Total | 81 | 99 | 81 | 99 | 90
Unpaid Principal Balance, Total | 81 | 99 | 81 | 99 | 90
Related Allowance, With an allowance recorded, Total | 17 |  | 17 |  |
Average Recorded Investment, Total | 90 | 85 | 104 | 75 | 95
Interest Income Recognized, Total |  |  |  |  |

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