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Loans and Allowance for Loan Losses - Impaired Loans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance $ 6,689,000 $ 20,038,000
Impaired loans, Unpaid Contractual Principal Balance 41,056,000 69,166,000
Recorded Principal Balance, with no related allowance 3,500,000 11,752,000
Impaired loans, Recorded Principal Balance 36,868,000 57,279,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 8,917,000 16,770,000
Unpaid Contractual Principal Balance, with related allowance 34,367,000 49,128,000
Recorded Principal Balance, with related allowance 33,368,000 45,527,000
Impaired loans, Related Allowance 12,386,000 17,189,000
Year-To-Date Average Recorded Principal Balance, with related allowance 41,044,000 44,548,000
Impaired loans, Year-To-Date Average Recorded Principal Balance 49,961,000 61,318,000
Commercial and Industrial [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 2,229,000 1,926,000
Recorded Principal Balance, with no related allowance 511,000 1,617,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 1,205,000 3,140,000
Unpaid Contractual Principal Balance, with related allowance 1,517,000 3,221,000
Recorded Principal Balance, with related allowance 1,440,000 1,926,000
Impaired loans, Related Allowance 792,000 924,000
Year-To-Date Average Recorded Principal Balance, with related allowance 1,880,000 3,110,000
Commercial Vacant Land, Land Development, and Residential Construction [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 475,000 2,356,000
Recorded Principal Balance, with no related allowance 362,000 1,401,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 991,000 1,848,000
Unpaid Contractual Principal Balance, with related allowance 4,436,000 2,333,000
Recorded Principal Balance, with related allowance 4,139,000 2,219,000
Impaired loans, Related Allowance 844,000 1,367,000
Year-To-Date Average Recorded Principal Balance, with related allowance 3,354,000 3,267,000
Commercial Real Estate - Owner Occupied [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 1,270,000 2,368,000
Recorded Principal Balance, with no related allowance 785,000 1,557,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 1,084,000 3,139,000
Unpaid Contractual Principal Balance, with related allowance 1,513,000 4,307,000
Recorded Principal Balance, with related allowance 1,513,000 3,626,000
Impaired loans, Related Allowance 528,000 1,388,000
Year-To-Date Average Recorded Principal Balance, with related allowance 2,550,000 4,913,000
Commercial Real Estate - Non-Owner Occupied [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 895,000 9,984,000
Recorded Principal Balance, with no related allowance 733,000 5,492,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 4,049,000 6,578,000
Unpaid Contractual Principal Balance, with related allowance 21,088,000 33,818,000
Recorded Principal Balance, with related allowance 21,072,000 32,964,000
Impaired loans, Related Allowance 7,969,000 11,773,000
Year-To-Date Average Recorded Principal Balance, with related allowance 28,388,000 25,061,000
Commercial Real Estate - Multi-Family and Residential Rental [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 41,000 1,188,000
Recorded Principal Balance, with no related allowance 1,000 413,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 390,000 756,000
Unpaid Contractual Principal Balance, with related allowance 3,219,000 4,471,000
Recorded Principal Balance, with related allowance 2,684,000 3,923,000
Impaired loans, Related Allowance 1,127,000 1,408,000
Year-To-Date Average Recorded Principal Balance, with related allowance 2,915,000 7,429,000
Commercial Loans [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 4,910,000 17,822,000
Impaired loans, Unpaid Contractual Principal Balance 36,683,000 65,972,000
Recorded Principal Balance, with no related allowance 2,392,000 10,480,000
Impaired loans, Recorded Principal Balance 33,240,000 55,138,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 7,719,000 15,461,000
Unpaid Contractual Principal Balance, with related allowance 31,773,000 48,150,000
Recorded Principal Balance, with related allowance 30,848,000 44,658,000
Impaired loans, Related Allowance 11,260,000 16,860,000
Year-To-Date Average Recorded Principal Balance, with related allowance 39,087,000 43,780,000
Impaired loans, Year-To-Date Average Recorded Principal Balance 46,806,000 59,241,000
Retail Home Equity and Other [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 507,000 580,000
Recorded Principal Balance, with no related allowance 461,000 483,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 471,000 579,000
Unpaid Contractual Principal Balance, with related allowance 320,000 423,000
Recorded Principal Balance, with related allowance 289,000 394,000
Impaired loans, Related Allowance 96,000 204,000
Year-To-Date Average Recorded Principal Balance, with related allowance 329,000 286,000
Retail 1-4 Family Mortgages [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 1,272,000 1,636,000
Recorded Principal Balance, with no related allowance 647,000 789,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 727,000 730,000
Unpaid Contractual Principal Balance, with related allowance 2,274,000 555,000
Recorded Principal Balance, with related allowance 2,231,000 475,000
Impaired loans, Related Allowance 1,030,000 125,000
Year-To-Date Average Recorded Principal Balance, with related allowance 1,628,000 482,000
Retail Loans [Member]
    
Impaired Loans By Type [Line Items]    
Unpaid Contractual Principal Balance, with no related allowance 1,779,000 2,216,000
Impaired loans, Unpaid Contractual Principal Balance 4,373,000 3,194,000
Recorded Principal Balance, with no related allowance 1,108,000 1,272,000
Impaired loans, Recorded Principal Balance 3,628,000 2,141,000
Impaired loans, Related Allowance     
Year-To-Date Average Recorded Principal Balance, with no related allowance 1,198,000 1,309,000
Unpaid Contractual Principal Balance, with related allowance 2,594,000 978,000
Recorded Principal Balance, with related allowance 2,520,000 869,000
Impaired loans, Related Allowance 1,126,000 329,000
Year-To-Date Average Recorded Principal Balance, with related allowance 1,957,000 768,000
Impaired loans, Year-To-Date Average Recorded Principal Balance $ 3,155,000 $ 2,077,000