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Non-performing Assets and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total $ 3,016,771 $ 2,841,473
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,725,369 1,675,595
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 561,463 576,022
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 717,814 683,901
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,199 16,591
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 46,547 49,996
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 394,346 349,085
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 744,286 706,622
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 646,136 596,087
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 24,030 16,027
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 74,120 94,508
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 547,116 459,256
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 38,173 36,737
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 314,177 227,659
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 194,766 194,860
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,954,944 $ 2,774,491
Percentage of total loans 97.95% 97.64%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,671,634 $ 1,617,673
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 538,177 549,198
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 702,269 675,030
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,199 16,591
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 46,382 48,884
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 379,607 327,970
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 739,459 700,906
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 641,309 590,593
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 24,030 15,805
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 74,120 94,508
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 543,851 455,912
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 38,138 36,577
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 313,088 226,451
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 192,625 192,884
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 23,052 $ 20,820
Percentage of total loans 0.76% 0.73%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 23,052 $ 20,820
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,618 8,622
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 9,682 3,864
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 97 886
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,655 7,448
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 38,775 $ 46,162
Percentage of total loans 1.29% 1.62%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 30,683 $ 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 5,863 5,007
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 68 226
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 8,084 13,667
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 4,827 5,716
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 4,827 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 3,265 3,344
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 35 160
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,089 1,208
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,141 $ 1,976
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%