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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Commercial [Member] | Sep. 30, 2013 Commercial [Member] | Sep. 30, 2014 Commercial [Member] | Sep. 30, 2013 Commercial [Member] | Dec. 31, 2013 Commercial [Member] | Sep. 30, 2014 Real Estate Commercial [Member] | Sep. 30, 2014 Real Estate Commercial [Member] | Dec. 31, 2013 Real Estate Commercial [Member] | Sep. 30, 2013 Real Estate Commercial [Member] | Jun. 30, 2013 Real Estate Commercial [Member] | Dec. 31, 2012 Real Estate Commercial [Member] | Sep. 30, 2014 Real Estate Residential [Member] | Sep. 30, 2013 Real Estate Residential [Member] | Sep. 30, 2014 Real Estate Residential [Member] | Sep. 30, 2013 Real Estate Residential [Member] | Dec. 31, 2013 Real Estate Residential [Member] | Sep. 30, 2014 Consumer [Member] | Sep. 30, 2013 Consumer [Member] | Sep. 30, 2014 Consumer [Member] | Sep. 30, 2013 Consumer [Member] | Dec. 31, 2013 Consumer [Member] | Sep. 30, 2014 Unallocated [Member] | Dec. 31, 2013 Unallocated [Member]
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 9,622 | $ 7,552 | $ 8,651 | $ 6,950 |  | $ 2,201 | $ 1,199 | $ 2,008 | $ 799 |  | $ 2,675 | $ 2,394 |  | $ 2,304 | $ 2,304 | $ 2,304 | $ 3,458 | $ 3,092 | $ 3,135 | $ 2,981 |  | $ 1,288 | $ 957 | $ 1,114 | $ 866 |  |  |
Charge-offs | (177) | (216) | (1,650) | (540) |  |  | (5) | (376) | (5) |  | (57) | (489) |  |  |  |  | (56) | (168) | (566) | (375) |  | (64) | (43) | (219) | (160) |  |  |
Recoveries | 60 | 10 | 446 | 136 |  | 5 |  | 6 |  |  | 22 | 291 |  |  |  |  |  | 5 | 38 | 111 |  | 33 | 5 | 111 | 25 |  |  |
Provisions | 666 | 525 | 2,724 | 1,325 |  | 152 | 513 | 720 | 913 |  | 185 | 629 |  |  |  |  | 239 | (98) | 1,034 | 114 |  | 90 | 110 | 341 | 298 |  |  |
Ending balance | 10,171 | 7,871 | 10,171 | 7,871 |  | 2,358 | 1,707 | 2,358 | 1,707 |  | 2,825 | 2,825 |  | 2,304 | 2,304 | 2,304 | 3,641 | 2,831 | 3,641 | 2,831 |  | 1,347 | 1,029 | 1,347 | 1,029 |  |  |
Ending balance: individually evaluated for impairment | 2,115 |  | 2,115 |  | 2,024 | 1,163 |  | 1,163 |  | 1,500 | 660 | 660 | 300 |  |  |  | 275 |  | 275 |  | 224 | 17 |  | 17 |  |  |  |
Ending balance: collectively evaluated for impairment | 8,056 |  | 8,056 |  | 6,627 | 1,195 |  | 1,195 |  | 508 | 2,165 | 2,165 | 2,094 |  |  |  | 3,366 |  | 3,366 |  | 2,911 | 1,330 |  | 1,330 |  | 1,114 |  |
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 1,179,942 |  | 1,179,942 |  | 1,176,617 | 323,312 |  | 323,312 |  | 350,680 | 456,153 | 456,153 | 413,058 |  |  |  | 315,082 |  | 315,082 |  | 322,062 | 85,395 |  | 85,395 |  | 90,817 |  |
Ending balance: individually evaluated for impairment | 13,919 |  | 13,919 |  | 15,626 | 2,721 |  | 2,721 |  | 4,504 | 7,799 | 7,799 | 7,711 |  |  |  | 3,318 |  | 3,318 |  | 3,321 | 81 |  | 81 |  | 90 |  |
Ending balance: collectively evaluated for impairment | 1,163,181 |  | 1,163,181 |  | 1,153,671 | 319,179 |  | 319,179 |  | 343,502 | 446,985 | 446,985 | 401,168 |  |  |  | 311,703 |  | 311,703 |  | 318,274 | 85,314 |  | 85,314 |  | 90,727 |  |
Ending balance: loans acquired with deteriorated credit quality | $ 2,842 |  | $ 2,842 |  | $ 7,320 | $ 1,412 |  | $ 1,412 |  | $ 2,674 | $ 1,369 | $ 1,369 | $ 4,179 |  |  |  | $ 61 |  | $ 61 |  | $ 467 |  |  |  |  |  |  |

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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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