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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Total $ 3,665,343 $ 3,012,553
Percentage of total loans 100.00% 100.00%
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,048,035 $ 1,723,535
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 723,218 563,929
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 766,574 714,136
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,813 5,195
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 37,115 46,523
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 510,315 393,752
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 952,116 742,244
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 773,444 644,094
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 23,041 24,030
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 155,631 74,120
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 665,192 546,774
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 42,048 34,233
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 344,567 314,177
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 278,577 198,364
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 3,570,214 $ 2,950,726
Percentage of total loans 97.40% 97.95%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,963,867 $ 1,669,800
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 696,380 540,643
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 751,995 698,591
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,813 5,195
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 33,957 46,358
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 470,722 379,013
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 944,905 737,417
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 766,233 639,267
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 23,041 24,030
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 155,631 74,120
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 661,442 543,509
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 41,971 34,198
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 343,413 313,088
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 276,058 196,223
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 32,999 $ 23,052
Percentage of total loans 0.90% 0.77%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 32,999 $ 23,052
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 7,776 6,618
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,654 9,682
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total   97
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 19,569 6,655
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 62,130 $ 38,775
Percentage of total loans 1.70% 1.29%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 51,169 $ 30,683
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 19,062 16,668
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 8,925 5,863
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,158 68
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 20,024 8,084
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 7,211 4,827
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 7,211 4,827
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,750 3,265
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 77 35
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,154 1,089
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,519 $ 2,141
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%