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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,961,481 | $ 2,838,288
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,702,839 | 1,675,389
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 583,261 | 575,816
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 704,284 | 683,901
Commercial [Member] | Residential Spec Homes [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,254 | 16,591
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 43,889 | 49,996
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 364,151 | 349,085
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 724,771 | 703,643
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 630,955 | 593,108
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 22,394 | 16,027
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 71,422 | 94,508
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 533,871 | 459,256
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 37,895 | 36,737
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 303,579 | 227,659
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 192,397 | 194,860
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,907,992 | $ 2,771,306
Percentage of total loans | 98.19% | 97.64%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,655,379 | $ 1,617,467
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 563,429 | 548,992
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 692,995 | 675,030
Pass [Member] | Commercial [Member] | Residential Spec Homes [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,254 | 16,591
Pass [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 41,084 | 48,884
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 350,617 | 327,970
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 721,159 | 697,927
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 627,343 | 587,614
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 22,394 | 15,805
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 71,422 | 94,508
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 531,454 | 455,912
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 37,833 | 36,577
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 302,911 | 226,451
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 190,710 | 192,884
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 18,834 | $ 20,820
Percentage of total loans | 0.64% | 0.73%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 18,834 | $ 20,820
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,176 | 8,622
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,903 | 3,864
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,734 | 886
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,021 | 7,448
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 34,655 | $ 46,162
Percentage of total loans | 1.17% | 1.63%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 28,626 | $ 37,102
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 14,656 | 18,202
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,386 | 5,007
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 71 | 226
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 8,513 | 13,667
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,612 | 5,716
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,612 | 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 | 2,417 | 3,344
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 62 | 160
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 668 | 1,208
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,687 | $ 1,976
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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