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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
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 4,395 $ 7,167
60-89 Days Past Due 1,411 1,478
Greater than 90 Days 14,585 16,321
Total Past Due 20,391 24,966
Current 1,156,731 1,151,651
Total Loans 1,177,122 1,176,617
Loans > 90 Days and Accruing 1,663 1,455
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 809 1,052
60-89 Days Past Due 689 105
Greater than 90 Days 1,171 2,041
Total Past Due 2,669 3,198
Current 356,060 347,482
Total Loans 358,729 350,680
Loans > 90 Days and Accruing 7 6
Real Estate Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 268 1,641
60-89 Days Past Due 210 75
Greater than 90 Days 8,865 9,372
Total Past Due 9,343 11,088
Current 400,380 401,970
Total Loans 409,723 413,058
Loans > 90 Days and Accruing 221 200
Real Estate Residential [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 2,817 3,676
60-89 Days Past Due 430 985
Greater than 90 Days 3,835 4,247
Total Past Due 7,082 8,908
Current 313,721 313,154
Total Loans 320,803 322,062
Loans > 90 Days and Accruing 849 678
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 501 798
60-89 Days Past Due 82 313
Greater than 90 Days 714 661
Total Past Due 1,297 1,772
Current 86,570 89,045
Total Loans 87,867 90,817
Loans > 90 Days and Accruing $ 586 $ 571