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Loans and Allowance for Loan Losses - Activity for Loans Categorized as Troubled Debt Restructurings (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commercial and Industrial [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance $ 2,720,000 $ 4,553,000 $ 850,000
Charge-Offs (35,000) (540,000) (850,000)
Payments (2,781,000) (2,584,000) 0
Transfers to ORE (74,000) (96,000) 0
Net Additions/Deletions 1,826,000 1,387,000 4,553,000
Ending Balance 1,656,000 2,720,000 4,553,000
Commercial Vacant Land, Land Development, and Residential Construction [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 3,071,000 5,100,000 10,696,000
Charge-Offs (725,000) (63,000) (2,429,000)
Payments (1,596,000) (2,013,000) (3,137,000)
Transfers to ORE 0 0 (5,130,000)
Net Additions/Deletions 3,751,000 47,000 5,100,000
Ending Balance 4,501,000 3,071,000 5,100,000
Commercial Real Estate - Owner Occupied [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 4,116,000 6,183,000 2,589,000
Charge-Offs (70,000) (426,000) 0
Payments (2,151,000) (3,443,000) (2,477,000)
Transfers to ORE (363,000) (65,000) 0
Net Additions/Deletions 284,000 1,867,000 6,071,000
Ending Balance 1,816,000 4,116,000 6,183,000
Commercial Real Estate - Non-Owner Occupied [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 37,671,000 12,036,000 9,330,000
Charge-Offs (2,537,000) (720,000) (1,195,000)
Payments (13,795,000) (2,482,000) (3,614,000)
Transfers to ORE (1,153,000) (1,045,000) 0
Net Additions/Deletions 2,125,000 29,882,000 7,515,000
Ending Balance 22,311,000 37,671,000 12,036,000
Commercial Real Estate - Multi-Family and Residential Rental [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 3,027,000 12,626,000 7,848,000
Charge-Offs (15,000) (2,180,000) (21,000)
Payments (735,000) (7,422,000) (92,000)
Transfers to ORE 0 (186,000) 0
Net Additions/Deletions 343,000 189,000 4,891,000
Ending Balance 2,620,000 3,027,000 12,626,000
Retail Home Equity and Other [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 0 0 0
Charge-Offs 0 0 0
Payments 0 0 0
Transfers to ORE 0 0 0
Net Additions/Deletions 0 0 0
Ending Balance 0 0 0
Retail 1-4 Family Mortgages [Member]
      
Schedule Of Troubled Debt Restructured Loans [Line Items]      
Beginning Balance 155,000 164,000 0
Charge-Offs 0 0 0
Payments (46,000) (9,000) 0
Transfers to ORE 0 0 0
Net Additions/Deletions 1,878,000 0 164,000
Ending Balance $ 1,987,000 $ 155,000 $ 164,000