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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 6,532 | $ 15,365 | $ 6,532 | $ 15,365 | $ 8,066
Unpaid Principal Balance, With no related allowance, Total | 8,953 | 20,094 | 8,953 | 20,094 | 10,714
Average Recorded Investment, With no related allowance, Total | 6,667 | 15,101 | 7,048 | 15,897 | 13,438
Interest Income Recognized, With no related allowance, Total | 46 | 48 | 86 | 92 | 265
Recorded Investment, With an allowance recorded, Total | 8,471 | 3,401 | 8,471 | 3,401 | 6,525
Unpaid Principal Balance, With an allowance recorded, Total | 8,471 | 3,401 | 8,471 | 3,401 | 6,525
Related Allowance, With an allowance recorded, Total | 3,587 | 1,846 | 3,587 | 1,846 | 2,959
Average Recorded Investment, With an allowance recorded, Total | 7,884 | 3,397 | 7,399 | 3,640 | 4,680
Interest Income Recognized, With an allowance recorded, Total | 68 | 37 | 109 | 72 | 97
Recorded Investment, Total | 15,003 | 18,766 | 15,003 | 18,766 | 14,591
Unpaid Principal Balance, Total | 17,424 | 23,495 | 17,424 | 23,495 | 17,239
Related Allowance, With an allowance recorded, Total | 3,587 | 1,846 | 3,587 | 1,846 | 2,959
Average Recorded Investment, Total | 14,551 | 18,498 | 14,447 | 19,537 | 18,118
Interest Income Recognized, Total | 114 | 85 | 195 | 164 | 362
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,658 | 2,649 | 1,658 | 2,649 | 2,379
Unpaid Principal Balance, With no related allowance, Total | 3,184 | 4,470 | 3,184 | 4,470 | 4,084
Average Recorded Investment, With no related allowance, Total | 1,989 | 2,329 | 2,168 | 2,908 | 2,669
Interest Income Recognized, With no related allowance, Total | 17 | 28 | 37 | 52 | 141
Recorded Investment, With an allowance recorded, Total | 1,312 | 1,757 | 1,312 | 1,757 | 1,569
Unpaid Principal Balance, With an allowance recorded, Total | 1,312 | 1,757 | 1,312 | 1,757 | 1,569
Related Allowance, With an allowance recorded, Total | 1,209 | 1,157 | 1,209 | 1,157 | 1,240
Average Recorded Investment, With an allowance recorded, Total | 1,469 | 1,743 | 1,533 | 1,853 | 1,787
Interest Income Recognized, With an allowance recorded, Total | 13 | 23 | 27 | 43 | 58
Recorded Investment, Total | 2,970 | 4,406 | 2,970 | 4,406 | 3,948
Unpaid Principal Balance, Total | 4,496 | 6,227 | 4,496 | 6,227 | 5,653
Related Allowance, With an allowance recorded, Total | 1,209 | 1,157 | 1,209 | 1,157 | 1,240
Average Recorded Investment, Total | 3,458 | 4,072 | 3,701 | 4,761 | 4,456
Interest Income Recognized, Total | 30 | 51 | 64 | 95 | 199
Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,140 | 9,899 | 2,140 | 9,899 | 2,932
Unpaid Principal Balance, With no related allowance, Total | 2,852 | 12,619 | 2,852 | 12,619 | 3,690
Average Recorded Investment, With no related allowance, Total | 2,169 | 9,929 | 2,366 | 10,077 | 7,944
Interest Income Recognized, With no related allowance, Total | 28 | 19 | 47 | 38 | 120
Recorded Investment, With an allowance recorded, Total | 5,316 | 1,387 | 5,316 | 1,387 | 3,525
Unpaid Principal Balance, With an allowance recorded, Total | 5,316 | 1,387 | 5,316 | 1,387 | 3,525
Related Allowance, With an allowance recorded, Total | 1,445 | 527 | 1,445 | 527 | 912
Average Recorded Investment, With an allowance recorded, Total | 4,628 | 1,395 | 4,182 | 1,397 | 2,293
Interest Income Recognized, With an allowance recorded, Total | 48 | 14 | 65 | 29 | 28
Recorded Investment, Total | 7,456 | 11,286 | 7,456 | 11,286 | 6,457
Unpaid Principal Balance, Total | 8,168 | 14,006 | 8,168 | 14,006 | 7,215
Related Allowance, With an allowance recorded, Total | 1,445 | 527 | 1,445 | 527 | 912
Average Recorded Investment, Total | 6,797 | 11,324 | 6,548 | 11,474 | 10,237
Interest Income Recognized, Total | 76 | 33 | 112 | 67 | 148
Real Estate Residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,734 | 2,720 | 2,734 | 2,720 | 2,672
Unpaid Principal Balance, With no related allowance, Total | 2,917 | 2,908 | 2,917 | 2,908 | 2,857
Average Recorded Investment, With no related allowance, Total | 2,503 | 2,730 | 2,488 | 2,801 | 2,731
Interest Income Recognized, With no related allowance, Total | 1 | 1 | 2 | 2 | 4
Recorded Investment, With an allowance recorded, Total | 1,706 | 257 | 1,706 | 257 | 1,387
Unpaid Principal Balance, With an allowance recorded, Total | 1,706 | 257 | 1,706 | 257 | 1,387
Related Allowance, With an allowance recorded, Total | 796 | 162 | 796 | 162 | 769
Average Recorded Investment, With an allowance recorded, Total | 1,673 | 259 | 1,593 | 390 | 590
Interest Income Recognized, With an allowance recorded, Total | 7 |  | 17 |  | 10
Recorded Investment, Total | 4,440 | 2,977 | 4,440 | 2,977 | 4,059
Unpaid Principal Balance, Total | 4,623 | 3,165 | 4,623 | 3,165 | 4,244
Related Allowance, With an allowance recorded, Total | 796 | 162 | 796 | 162 | 769
Average Recorded Investment, Total | 4,176 | 2,989 | 4,081 | 3,191 | 3,321
Interest Income Recognized, Total | 8 | 1 | 19 | 2 | 14
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total |  | 97 |  | 97 | 83
Unpaid Principal Balance, With no related allowance, Total |  | 97 |  | 97 | 83
Average Recorded Investment, With no related allowance, Total | 6 | 113 | 26 | 111 | 94
Recorded Investment, With an allowance recorded, Total | 137 |  | 137 |  | 44
Unpaid Principal Balance, With an allowance recorded, Total | 137 |  | 137 |  | 44
Related Allowance, With an allowance recorded, Total | 137 |  | 137 |  | 38
Average Recorded Investment, With an allowance recorded, Total | 114 |  | 91 |  | 10
Interest Income Recognized, With an allowance recorded, Total |  |  |  |  | 1
Recorded Investment, Total | 137 | 97 | 137 | 97 | 127
Unpaid Principal Balance, Total | 137 | 97 | 137 | 97 | 127
Related Allowance, With an allowance recorded, Total | 137 |  | 137 |  | 38
Average Recorded Investment, Total | $ 120 | $ 113 | $ 117 | $ 111 | 104
Interest Income Recognized, Total |  |  |  |  | $ 1

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