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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 | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | $ 9,896 | $ 1,408 | $ 1,489
Unpaid Principal Balance, With no related allowance, Total | 17,681 | 1,408 | 1,489
Average Recorded Investment, With no related allowance, Total | 9,956 | 1,573 | 1,578
Recorded Investment, With an allowance recorded, Total | 4,378 | 3,863 | 2,045
Unpaid Principal Balance, With an allowance recorded, Total | 4,378 | 3,863 | 2,045
Related Allowance, With an allowance recorded, Total | 2,024 | 1,226 | 658
Average Recorded Investment, With an allowance recorded, Total | 4,263 | 3,495 | 2,057
Interest Income Recognized, With an allowance recorded, Total | 184 | 175 | 28
Recorded Investment, Total | 14,274 | 5,271 | 3,534
Unpaid Principal Balance, Total | 22,059 | 5,271 | 3,534
Average Recorded Investment, Total | 14,219 | 5,068 | 3,635
Interest Income Recognized, Total | 184 | 175 | 28
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 3,009 | 304 |
Unpaid Principal Balance, With no related allowance, Total | 7,506 | 304 |
Average Recorded Investment, With no related allowance, Total | 3,855 | 152 |
Recorded Investment, With an allowance recorded, Total | 2,200 | 351 | 845
Unpaid Principal Balance, With an allowance recorded, Total | 2,200 | 351 | 845
Related Allowance, With an allowance recorded, Total | 1,500 | 351 | 443
Average Recorded Investment, With an allowance recorded, Total | 2,182 | 351 | 1,000
Interest Income Recognized, With an allowance recorded, Total | 95 | 17 | 28
Recorded Investment, Total | 5,209 | 655 | 845
Unpaid Principal Balance, Total | 9,706 | 655 | 845
Average Recorded Investment, Total | 6,037 | 503 | 1,000
Interest Income Recognized, Total | 95 | 17 | 28
Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 3,923 | 145 | 591
Unpaid Principal Balance, With no related allowance, Total | 6,777 | 145 | 591
Average Recorded Investment, With no related allowance, Total | 3,522 | 201 | 390
Recorded Investment, With an allowance recorded, Total | 1,394 | 2,015 |
Unpaid Principal Balance, With an allowance recorded, Total | 1,394 | 2,015 |
Related Allowance, With an allowance recorded, Total | 300 | 550 |
Average Recorded Investment, With an allowance recorded, Total | 1,409 | 2,104 |
Interest Income Recognized, With an allowance recorded, Total | 76 | 114 |
Recorded Investment, Total | 5,317 | 2,160 | 591
Unpaid Principal Balance, Total | 8,171 | 2,160 | 591
Average Recorded Investment, Total | 4,931 | 2,305 | 390
Interest Income Recognized, Total | 76 | 114 |
Real Estate Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 2,874 | 928 | 806
Unpaid Principal Balance, With no related allowance, Total | 3,308 | 928 | 806
Average Recorded Investment, With no related allowance, Total | 2,484 | 1,152 | 1,081
Recorded Investment, With an allowance recorded, Total | 784 | 1,497 | 1,200
Unpaid Principal Balance, With an allowance recorded, Total | 784 | 1,497 | 1,200
Related Allowance, With an allowance recorded, Total | 224 | 325 | 215
Average Recorded Investment, With an allowance recorded, Total | 672 | 1,040 | 1,057
Interest Income Recognized, With an allowance recorded, Total | 13 | 44 |
Recorded Investment, Total | 3,658 | 2,425 | 2,006
Unpaid Principal Balance, Total | 4,092 | 2,425 | 2,006
Average Recorded Investment, Total | 3,156 | 2,192 | 2,138
Interest Income Recognized, Total | 13 | 44 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 90 | 31 | 92
Unpaid Principal Balance, With no related allowance, Total | 90 | 31 | 92
Average Recorded Investment, With no related allowance, Total | 95 | 68 | 107
Recorded Investment, With an allowance recorded, Total |  |  |
Unpaid Principal Balance, With an allowance recorded, Total |  |  |
Related Allowance, With an allowance recorded, Total |  |  |
Average Recorded Investment, With an allowance recorded, Total |  |  |
Interest Income Recognized, With an allowance recorded, Total |  |  |
Recorded Investment, Total | 90 | 31 | 92
Unpaid Principal Balance, Total | 90 | 31 | 92
Average Recorded Investment, Total | 95 | 68 | 107
Interest Income Recognized, Total |  |  |

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