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Loans, net and allowance for loan losses - Major Classifications of Loans by Past Due Status (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 5,184 $ 7,167
60-89 Days Past Due 1,170 1,478
Greater than 90 Days 15,309 16,321
Total Past Due 21,663 24,966
Current 1,158,184 1,151,651
Total Loans 1,179,847 1,176,617
Loans > 90 Days and Accruing 1,693 1,455
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 519 1,052
60-89 Days Past Due   105
Greater than 90 Days 1,837 2,041
Total Past Due 2,356 3,198
Current 334,677 347,482
Total Loans 337,033 350,680
Loans > 90 Days and Accruing 60 6
Real Estate Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,337 1,641
60-89 Days Past Due 34 75
Greater than 90 Days 8,779 9,372
Total Past Due 10,150 11,088
Current 429,792 401,970
Total Loans 439,942 413,058
Loans > 90 Days and Accruing   200
Real Estate Residential [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 2,600 3,676
60-89 Days Past Due 940 985
Greater than 90 Days 4,221 4,247
Total Past Due 7,761 8,908
Current 310,168 313,154
Total Loans 317,929 322,062
Loans > 90 Days and Accruing 1,258 678
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 728 798
60-89 Days Past Due 196 313
Greater than 90 Days 472 661
Total Past Due 1,396 1,772
Current 83,547 89,045
Total Loans 84,943 90,817
Loans > 90 Days and Accruing $ 375 $ 571