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Non-performing Assets and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,825,702 | $ 2,130,369
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,612,209 | 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 547,596 | 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 664,281 | 461,897
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 16,431 | 5,006
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 48,674 | 31,228
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 335,227 | 230,520
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 698,893 | 664,571
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 588,358 | 508,233
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 16,027 | 20,611
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 94,508 | 135,727
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 514,600 | 399,599
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 89,617 | 71,150
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 82 | 119
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 227,323 | 153,204
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 197,578 | 175,126
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,758,720 | $ 2,090,978
Percentage of total loans | 97.63% | 98.15%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,554,500 | $ 1,035,059
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 520,907 | 322,924
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 655,410 | 455,648
Pass [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 16,431 | 5,006
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 47,562 | 31,057
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 314,190 | 220,424
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 693,177 | 659,549
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 582,864 | 503,444
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 15,805 | 20,378
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 94,508 | 135,727
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 511,043 | 396,370
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 89,244 | 70,638
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 82 | 119
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 226,115 | 152,496
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 195,602 | 173,117
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 20,820 | $ 9,029
Percentage of total loans | 0.74% | 0.42%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 20,820 | $ 9,029
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 8,622 | 4,960
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,864 | 341
Special Mention [Member] | Commercial [Member] | Development & Spec Land Loans [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 | 7,448 | 3,728
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 46,162 | $ 30,362
Percentage of total loans | 1.63% | 1.43%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 36,889 | $ 22,111
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 18,067 | 9,664
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,007 | 5,908
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 226 | 171
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 13,589 | 6,368
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,716 | 5,022
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,494 | 4,789
Substandard [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 222 | 233
Substandard [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,557 | 3,229
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 373 | 512
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,208 | 708
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,976 | $ 2,009
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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