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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,187,313 $ 1,745,340
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,045,478 802,792
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 321,762 268,281
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 457,555 326,399
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 7,949 5,018
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 39,798 18,183
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 218,414 184,911
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 754,482 579,367
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 506,545 414,924
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 21,061 19,751
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 226,876 144,692
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 387,353 363,181
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 66,495 54,341
Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 124 153
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 147,829 151,523
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 172,905 157,164
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,146,808 $ 1,713,981
Percentage of total loans 98.15% 98.20%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,012,178 $ 781,108
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 305,849 257,181
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 450,811 320,216
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 7,949 5,018
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 39,571 18,112
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 207,998 180,581
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 751,520 573,130
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 503,821 408,937
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 20,823 19,501
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 226,876 144,692
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 383,110 359,743
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 64,990 53,800
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 124 153
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 146,844 150,895
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 171,152 154,895
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 7,021 $ 6,232
Percentage of total loans 0.32% 0.36%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 7,021 $ 6,232
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,258 4,954
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 344 585
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,419 693
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 33,484 $ 25,127
Percentage of total loans 1.53% 1.44%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 26,279 $ 15,452
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,655 6,146
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,400 5,598
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 227 71
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 8,997 3,637
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,962 6,237
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,724 5,987
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 238 250
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 4,243 3,438
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,505 541
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 985 628
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,753 $ 2,269
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%