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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%

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