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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,919,888 $ 2,825,702
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,668,397 1,664,067
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 591,273 571,982
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 678,913 678,945
Commercial [Member] | Residential Spec Homes [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 11,614 16,431
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 34,384 48,838
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 352,213 347,871
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 741,472 698,893
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 610,871 588,358
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 21,585 16,027
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 109,016 94,508
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 510,019 462,742
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 39,065 37,841
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 276,317 227,323
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 194,637 197,578
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,862,424 $ 2,758,720
Percentage of total loans 98.03% 97.63%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,617,344 $ 1,606,145
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 569,089 545,158
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 667,031 670,074
Pass [Member] | Commercial [Member] | Residential Spec Homes [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 11,614 16,431
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 34,168 47,726
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 335,442 326,756
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 737,568 693,177
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 606,967 582,864
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 21,585 15,805
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 109,016 94,508
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 507,512 459,398
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 39,011 37,681
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 275,660 226,115
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 192,841 195,602
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 16,523 $ 20,820
Percentage of total loans 0.57% 0.74%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 16,523 $ 20,820
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,772 8,622
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,888 3,864
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 144 886
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 4,719 7,448
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 40,941 $ 46,162
Percentage of total loans 1.40% 1.63%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 34,530 $ 37,102
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 16,412 18,202
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,994 5,007
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 72 226
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 12,052 13,667
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,904 5,716
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,904 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 2,507 3,344
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 54 160
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 657 1,208
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,796 $ 1,976
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%