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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 | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Allowance for loan losses: |  |  |
Beginning balance | $ 6,950 | $ 6,711 | $ 6,500
Charge-offs | (841) | (817) | (2,300)
Recoveries | 181 | 132 | 130
Provisions | 2,361 | 924 | 2,381
Ending balance | 8,651 | 6,950 | 6,711
Beginning balance | 6,950 | 6,711 | 6,500
Ending balance: individually evaluated for impairment | 2,024 | 1,226 | 658
Charge-offs | (841) | (817) | (2,300)
Ending balance: collectively evaluated for impairment | 6,627 | 5,724 | 6,053
Recoveries | 181 | 132 | 130
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance | 1,176,617 | 623,530 | 631,522
Provisions | 2,361 | 924 | 2,381
Loans receivable: |  |  |
Ending balance | 1,176,617 | 623,530 | 631,522
Ending balance: individually evaluated for impairment | 14,274 | 5,271 | 3,534
Ending balance: collectively evaluated for impairment | 1,154,952 | 618,259 | 627,988
Ending balance: loans acquired with deteriorated credit quality | 7,391 |  |
Ending balance: individually evaluated for impairment | 14,274 | 5,271 | 3,534
Ending balance | 8,651 | 6,950 | 6,711
Ending balance: collectively evaluated for impairment | 1,154,952 | 618,259 | 627,988
Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning balance | 799 | 793 | 1,957
Charge-offs | (5) | (78) | (100)
Recoveries | 1 | 1 | 3
Provisions | 1,213 | 83 | (1,067)
Ending balance | 2,008 | 799 | 793
Beginning balance | 799 | 793 | 1,957
Ending balance: individually evaluated for impairment | 1,500 | 351 | 443
Charge-offs | (5) | (78) | (100)
Ending balance: collectively evaluated for impairment | 508 | 448 | 350
Recoveries | 1 | 1 | 3
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance | 350,680 | 91,724 | 88,188
Provisions | 1,213 | 83 | (1,067)
Loans receivable: |  |  |
Ending balance | 350,680 | 91,724 | 88,188
Ending balance: individually evaluated for impairment | 5,209 | 655 | 845
Ending balance: collectively evaluated for impairment | 342,719 | 91,069 | 87,343
Ending balance: loans acquired with deteriorated credit quality | 2,752 |  |
Ending balance: individually evaluated for impairment | 5,209 | 655 | 845
Ending balance | 2,008 | 799 | 793
Ending balance: collectively evaluated for impairment | 342,719 | 91,069 | 87,343
Real Estate Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning balance | 2,304 | 2,294 | 2,067
Charge-offs | (15) | (33) | (663)
Recoveries | 20 | 6 | 18
Provisions | 85 | 37 | 872
Ending balance | 2,394 | 2,304 | 2,294
Beginning balance | 2,304 | 2,294 | 2,067
Ending balance: individually evaluated for impairment | 300 | 550 |
Charge-offs | (15) | (33) | (663)
Ending balance: collectively evaluated for impairment | 2,094 | 1,754 | 2,294
Recoveries | 20 | 6 | 18
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance | 413,058 | 217,496 | 208,875
Provisions | 85 | 37 | 872
Loans receivable: |  |  |
Ending balance | 413,058 | 217,496 | 208,875
Ending balance: individually evaluated for impairment | 5,317 | 2,160 | 591
Ending balance: collectively evaluated for impairment | 403,560 | 215,336 | 208,284
Ending balance: loans acquired with deteriorated credit quality | 4,181 |  |
Ending balance: individually evaluated for impairment | 5,317 | 2,160 | 591
Ending balance | 2,394 | 2,304 | 2,294
Ending balance: collectively evaluated for impairment | 403,560 | 215,336 | 208,284
Real Estate Residential [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning balance | 2,981 | 2,855 | 753
Charge-offs | (508) | (431) | (1,275)
Recoveries | 111 | 67 | 58
Provisions | 551 | 490 | 3,319
Ending balance | 3,135 | 2,981 | 2,855
Beginning balance | 2,981 | 2,855 | 753
Ending balance: individually evaluated for impairment | 224 | 325 | 215
Charge-offs | (508) | (431) | (1,275)
Ending balance: collectively evaluated for impairment | 2,911 | 2,656 | 2,640
Recoveries | 111 | 67 | 58
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance | 322,062 | 261,912 | 281,643
Provisions | 551 | 490 | 3,319
Loans receivable: |  |  |
Ending balance | 322,062 | 261,912 | 281,643
Ending balance: individually evaluated for impairment | 3,658 | 2,425 | 2,006
Ending balance: collectively evaluated for impairment | 317,946 | 259,487 | 279,637
Ending balance: loans acquired with deteriorated credit quality | 458 |  |
Ending balance: individually evaluated for impairment | 3,658 | 2,425 | 2,006
Ending balance | 3,135 | 2,981 | 2,855
Ending balance: collectively evaluated for impairment | 317,946 | 259,487 | 279,637
Consumer [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning balance | 866 | 769 | 1,723
Charge-offs | (313) | (275) | (262)
Recoveries | 49 | 58 | 51
Provisions | 512 | 314 | (743)
Ending balance | 1,114 | 866 | 769
Beginning balance | 866 | 769 | 1,723
Ending balance: individually evaluated for impairment |  |  |
Charge-offs | (313) | (275) | (262)
Ending balance: collectively evaluated for impairment | 1,114 | 866 | 769
Recoveries | 49 | 58 | 51
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance | 90,817 | 52,398 | 52,816
Provisions | 512 | 314 | (743)
Loans receivable: |  |  |
Ending balance | 90,817 | 52,398 | 52,816
Ending balance: individually evaluated for impairment | 90 | 31 | 92
Ending balance: collectively evaluated for impairment | 90,727 | 52,367 | 52,724
Ending balance: individually evaluated for impairment | 90 | 31 | 92
Ending balance | 1,114 | 866 | 769
Ending balance: collectively evaluated for impairment | 90,727 | 52,367 | 52,724
Unallocated [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning balance |  |  |
Charge-offs |  |  |
Recoveries |  |  |
Provisions |  |  |
Ending balance |  |  |
Beginning balance |  |  |
Ending balance: individually evaluated for impairment |  |  |
Charge-offs |  |  |
Ending balance: collectively evaluated for impairment |  |  |
Recoveries |  |  |
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance |  |  |
Provisions |  |  |
Loans receivable: |  |  |
Ending balance |  |  |
Ending balance: individually evaluated for impairment |  |  |
Ending balance: collectively evaluated for impairment |  |  |
Ending balance: loans acquired with deteriorated credit quality |  |  |
Ending balance: individually evaluated for impairment |  |  |
Ending balance |  |  |
Ending balance: collectively evaluated for impairment |  |  |

X
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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=28368275&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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