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Loans Receivable and Allowance for Loan Losses - Average Recorded Investment in Impaired Loans and Related Interest Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance $ 23,588 $ 18,519 $ 24,169 $ 19,356
Interest Income Recognized 144 173 173 178
Commercial Real Estate [Member] | Owner-Occupied [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 4,069 3,041 4,233 2,833
Interest Income Recognized 8 58 18 58
Commercial Real Estate [Member] | Non-Owner Occupied [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 9,641 2,635 8,800 2,910
Interest Income Recognized 91 36 95 36
Commercial Real Estate [Member] | Multi - Family [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 260 0 280 6
Interest Income Recognized 0 0 1 0
Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 2,139 4,929 2,923 5,075
Interest Income Recognized 2 12 10 15
Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 0 578 0 688
Interest Income Recognized 0 0 0 0
Acquisition and Development [Member] | Commercial and Land Development [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 1,360 2,761 1,966 3,110
Interest Income Recognized 11 2 13 2
Commercial and Industrial [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 2,004 1,618 2,003 1,685
Interest Income Recognized 2 65 5 65
Residential Mortgage [Member] | First Lien [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 3,964 2,601 3,768 2,594
Interest Income Recognized 30 0 31 2
Residential Mortgage [Member] | Home Equity - Term [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 90 40 96 46
Interest Income Recognized 0 0 0 0
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 59 314 99 407
Interest Income Recognized 0 0 0 0
Installment and Other Loans [Member]
        
Financing Receivable, Impaired [Line Items]        
Average Impaired Balance 2 2 1 2
Interest Income Recognized $ 0 $ 0 $ 0 $ 0