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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Total $ 2,851,359 $ 2,825,702  
Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 1,651,355 1,664,067  
Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 581,696 571,982  
Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 677,932 678,945  
Commercial [Member] | Residential Spec Homes [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 17,473 16,431  
Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 33,736 48,838  
Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 340,518 347,871  
Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 717,170 698,893  
Real Estate [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 595,424 588,358  
Real Estate [Member] | Residential Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 20,447 16,027  
Real Estate [Member] | Mortgage Warehousing [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 101,299 94,508  
Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 482,834 462,742  
Consumer [Member] | Direct Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 37,414 37,841  
Consumer [Member] | Indirect Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 250,925 227,323  
Consumer [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 194,495 197,578  
Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 2,785,292 $ 2,758,720  
Percentage of total loans   97.63% 97.68%
Pass [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 1,593,591 $ 1,606,145  
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 551,813 545,158  
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 667,528 670,074  
Pass [Member] | Commercial [Member] | Residential Spec Homes [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 17,473 16,431  
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 33,660 47,726  
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 323,117 326,756  
Pass [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 711,894 693,177  
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 590,148 582,864  
Pass [Member] | Real Estate [Member] | Residential Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 20,447 15,805  
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 101,299 94,508  
Pass [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 479,807 459,398  
Pass [Member] | Consumer [Member] | Direct Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 37,261 37,681  
Pass [Member] | Consumer [Member] | Indirect Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 250,029 226,115  
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 192,517 195,602  
Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 23,032 $ 20,820  
Percentage of total loans   0.74% 0.81%
Special Mention [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 23,032 $ 20,820  
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 13,215 8,622  
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 5,014 3,864  
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total   886  
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 4,803 7,448  
Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 43,035 $ 46,162  
Percentage of total loans   1.63% 1.51%
Substandard [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 34,732 $ 37,102  
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 16,668 18,202  
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 5,390 5,007  
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 76 226  
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 12,598 13,667  
Substandard [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 5,276 5,716  
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 5,276 5,494  
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total   222  
Substandard [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 3,027 3,344  
Substandard [Member] | Consumer [Member] | Direct Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 153 160  
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 896 1,208  
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total $ 1,978 $ 1,976  
Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Percentage of total loans   0.00% 0.00%