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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
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 3,782 $ 7,167
60-89 Days Past Due 1,592 1,478
Greater than 90 Days 12,279 16,321
Total Past Due 17,653 24,966
Current 1,162,289 1,151,651
Total Loans 1,179,942 1,176,617
Loans > 90 Days and Accruing 955 1,455
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 284 1,052
60-89 Days Past Due 17 105
Greater than 90 Days 1,668 2,041
Total Past Due 1,969 3,198
Current 321,343 347,482
Total Loans 323,312 350,680
Loans > 90 Days and Accruing 42 6
Real Estate Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,243 1,641
60-89 Days Past Due 200 75
Greater than 90 Days 6,676 9,372
Total Past Due 8,119 11,088
Current 448,034 401,970
Total Loans 456,153 413,058
Loans > 90 Days and Accruing 10 200
Real Estate Residential [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,631 3,676
60-89 Days Past Due 1,031 985
Greater than 90 Days 3,502 4,247
Total Past Due 6,164 8,908
Current 308,918 313,154
Total Loans 315,082 322,062
Loans > 90 Days and Accruing 551 678
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 624 798
60-89 Days Past Due 344 313
Greater than 90 Days 433 661
Total Past Due 1,401 1,772
Current 83,994 89,045
Total Loans 85,395 90,817
Loans > 90 Days and Accruing $ 352 $ 571