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Loans Receivable and Allowance for Loan Losses - Activity in Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period $ 20,965 $ 23,166
Provision for loan losses 0 0
Charge-offs (528) (1,345)
Recoveries 60 96
Balance, end of period 20,497 21,917
Commercial Real Estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 13,215 13,719
Provision for loan losses 738 (473)
Charge-offs (259) (1,142)
Recoveries 25 61
Balance, end of period 13,719 12,165
Acquisition and Development [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 670 3,502
Provision for loan losses (196) (746)
Charge-offs 0 (145)
Recoveries 0 3
Balance, end of period 474 2,614
Commercial and Industrial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 864 1,635
Provision for loan losses 60 (292)
Charge-offs (9) 0
Recoveries 4 10
Balance, end of period 919 1,353
Municipal [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 244 223
Provision for loan losses 0 62
Charge-offs 0 0
Recoveries 0 0
Balance, end of period 244 285
Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 14,993 19,079
Provision for loan losses 602 (1,449)
Charge-offs (268) (1,287)
Recoveries 29 74
Balance, end of period 15,356 16,417
Residential Mortgage [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 3,780 2,275
Provision for loan losses (481) 1,145
Charge-offs (193) (38)
Recoveries 6 6
Balance, end of period 3,112 3,388
Installment and Other Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 124 85
Provision for loan losses 44 31
Charge-offs (67) (20)
Recoveries 25 16
Balance, end of period 126 112
Consumer [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 3,904 2,360
Provision for loan losses (437) 1,176
Charge-offs (260) (58)
Recoveries 31 22
Balance, end of period 3,238 3,500
Unallocated [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Balance, beginning of period 2,068 1,727
Provision for loan losses (165) 273
Charge-offs 0 0
Recoveries 0 0
Balance, end of period $ 1,903 $ 2,000