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Loans and Allowance for Loan Losses - Impaired Loans (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance $ 12,456,000   $ 12,456,000   $ 20,038,000
Impaired loans, Unpaid Contractual Principal Balance 55,253,000   55,253,000   69,166,000
Recorded Principal Balance, with no related allowance 7,877,000   7,877,000   11,752,000
Impaired loans, Recorded Principal Balance 50,277,000   50,277,000   57,279,000
Impaired loans, Related Allowance 15,063,000   15,063,000   17,189,000
Average Recorded Principal Balance, with no related allowance 9,199,000 16,027,000      
Impaired Loans, Third Quarter Average Recorded Principal Balance 51,976,000 57,418,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     10,270,000 18,024,000  
Impaired loans, Year-To-Date Average Recorded Principal Balance     53,233,000 62,328,000  
Unpaid Contractual Principal Balance, with related allowance 42,797,000   42,797,000   49,128,000
Recorded Principal Balance, with related allowance 42,400,000   42,400,000   45,527,000
Impaired loans, Related Allowance 15,063,000   15,063,000   17,189,000
Impaired Loans, Average Recorded Principal Balance 42,777,000 41,391,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     42,963,000 44,304,000  
Commercial and Industrial [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 2,632,000   2,632,000   1,926,000
Recorded Principal Balance, with no related allowance 1,063,000   1,063,000   1,617,000
Impaired loans, Related Allowance 1,035,000   1,035,000   924,000
Average Recorded Principal Balance, with no related allowance 1,170,000 3,209,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     1,378,000 3,521,000  
Unpaid Contractual Principal Balance, with related allowance 2,002,000   2,002,000   3,221,000
Recorded Principal Balance, with related allowance 1,941,000   1,941,000   1,926,000
Impaired loans, Related Allowance 1,035,000   1,035,000   924,000
Impaired Loans, Average Recorded Principal Balance 1,764,000 3,528,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     1,990,000 3,406,000  
Commercial Vacant Land, Land Development, and Residential Construction [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 1,200,000   1,200,000   2,356,000
Recorded Principal Balance, with no related allowance 804,000   804,000   1,401,000
Impaired loans, Related Allowance 1,216,000   1,216,000   1,367,000
Average Recorded Principal Balance, with no related allowance 907,000 1,480,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     1,148,000 1,959,000  
Unpaid Contractual Principal Balance, with related allowance 4,557,000   4,557,000   2,333,000
Recorded Principal Balance, with related allowance 4,418,000   4,418,000   2,219,000
Impaired loans, Related Allowance 1,216,000   1,216,000   1,367,000
Impaired Loans, Average Recorded Principal Balance 4,466,000 2,981,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     3,158,000 3,529,000  
Commercial Real Estate - Owner Occupied [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 575,000   575,000   2,368,000
Recorded Principal Balance, with no related allowance 347,000   347,000   1,557,000
Impaired loans, Related Allowance 901,000   901,000   1,388,000
Average Recorded Principal Balance, with no related allowance 865,000 3,391,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     1,159,000 3,535,000  
Unpaid Contractual Principal Balance, with related allowance 2,368,000   2,368,000   4,307,000
Recorded Principal Balance, with related allowance 2,310,000   2,310,000   3,626,000
Impaired loans, Related Allowance 901,000   901,000   1,388,000
Impaired Loans, Average Recorded Principal Balance 2,330,000 4,120,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     2,810,000 5,235,000  
Commercial Real Estate - Non-Owner Occupied [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 5,135,000   5,135,000   9,984,000
Recorded Principal Balance, with no related allowance 4,108,000   4,108,000   5,492,000
Impaired loans, Related Allowance 9,785,000   9,785,000   11,773,000
Average Recorded Principal Balance, with no related allowance 4,651,000 5,832,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     4,878,000 6,850,000  
Unpaid Contractual Principal Balance, with related allowance 28,358,000   28,358,000   33,818,000
Recorded Principal Balance, with related allowance 28,346,000   28,346,000   32,964,000
Impaired loans, Related Allowance 9,785,000   9,785,000   11,773,000
Impaired Loans, Average Recorded Principal Balance 28,789,000 25,220,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     30,216,000 23,085,000  
Commercial Real Estate - Multi-Family and Residential Rental [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 1,008,000   1,008,000   1,188,000
Recorded Principal Balance, with no related allowance 337,000   337,000   413,000
Impaired loans, Related Allowance 923,000   923,000   1,408,000
Average Recorded Principal Balance, with no related allowance 425,000 918,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     487,000 841,000  
Unpaid Contractual Principal Balance, with related allowance 2,820,000   2,820,000   4,471,000
Recorded Principal Balance, with related allowance 2,752,000   2,752,000   3,923,000
Impaired loans, Related Allowance 923,000   923,000   1,408,000
Impaired Loans, Average Recorded Principal Balance 2,639,000 4,748,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     2,973,000 8,306,000  
Commercial Loans [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 10,550,000   10,550,000   17,822,000
Impaired loans, Unpaid Contractual Principal Balance 50,655,000   50,655,000   65,972,000
Recorded Principal Balance, with no related allowance 6,659,000   6,659,000   10,480,000
Impaired loans, Recorded Principal Balance 46,426,000   46,426,000   55,138,000
Impaired loans, Related Allowance 13,860,000   13,860,000   16,860,000
Average Recorded Principal Balance, with no related allowance 8,018,000 14,830,000      
Impaired Loans, Third Quarter Average Recorded Principal Balance 48,006,000 55,427,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     9,050,000 16,706,000  
Impaired loans, Year-To-Date Average Recorded Principal Balance     50,197,000 60,267,000  
Unpaid Contractual Principal Balance, with related allowance 40,105,000   40,105,000   48,150,000
Recorded Principal Balance, with related allowance 39,767,000   39,767,000   44,658,000
Impaired loans, Related Allowance 13,860,000   13,860,000   16,860,000
Impaired Loans, Average Recorded Principal Balance 39,988,000 40,597,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     41,147,000 43,561,000  
Retail Home Equity and Other [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 508,000   508,000   580,000
Recorded Principal Balance, with no related allowance 464,000   464,000   483,000
Impaired loans, Related Allowance 102,000   102,000   204,000
Average Recorded Principal Balance, with no related allowance 466,000 482,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     474,000 603,000  
Unpaid Contractual Principal Balance, with related allowance 322,000   322,000   423,000
Recorded Principal Balance, with related allowance 293,000   293,000   394,000
Impaired loans, Related Allowance 102,000   102,000   204,000
Impaired Loans, Average Recorded Principal Balance 309,000 291,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     339,000 259,000  
Retail 1-4 Family Mortgages [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 1,398,000   1,398,000   1,636,000
Recorded Principal Balance, with no related allowance 754,000   754,000   789,000
Impaired loans, Related Allowance 1,101,000   1,101,000   125,000
Average Recorded Principal Balance, with no related allowance 715,000 715,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     746,000 715,000  
Unpaid Contractual Principal Balance, with related allowance 2,370,000   2,370,000   555,000
Recorded Principal Balance, with related allowance 2,340,000   2,340,000   475,000
Impaired loans, Related Allowance 1,101,000   1,101,000   125,000
Impaired Loans, Average Recorded Principal Balance 2,480,000 503,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     1,477,000 484,000  
Retail Loans [Member]
          
Impaired Loans By Type [Line Items]          
Unpaid Contractual Principal Balance, with no related allowance 1,906,000   1,906,000   2,216,000
Impaired loans, Unpaid Contractual Principal Balance 4,598,000   4,598,000   3,194,000
Recorded Principal Balance, with no related allowance 1,218,000   1,218,000   1,272,000
Impaired loans, Recorded Principal Balance 3,851,000   3,851,000   2,141,000
Impaired loans, Related Allowance 1,203,000   1,203,000   329,000
Average Recorded Principal Balance, with no related allowance 1,181,000 1,197,000      
Impaired Loans, Third Quarter Average Recorded Principal Balance 3,970,000 1,991,000      
Year-To-Date Average Recorded Principal Balance, with no related allowance     1,220,000 1,318,000  
Impaired loans, Year-To-Date Average Recorded Principal Balance     3,036,000 2,061,000  
Unpaid Contractual Principal Balance, with related allowance 2,692,000   2,692,000   978,000
Recorded Principal Balance, with related allowance 2,633,000   2,633,000   869,000
Impaired loans, Related Allowance 1,203,000   1,203,000   329,000
Impaired Loans, Average Recorded Principal Balance 2,789,000 794,000      
Year-To-Date Average Recorded Principal Balance, with related allowance     $ 1,816,000 $ 743,000