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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
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