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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,421,076 | $ 2,130,369
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,270,160 | 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 403,184 | 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 531,560 | 461,897
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,031 | 5,006
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 43,299 | 31,228
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 288,086 | 230,520
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 663,759 | 664,571
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 553,451 | 508,233
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 14,825 | 20,611
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 95,483 | 135,727
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 487,157 | 399,599
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 85,726 | 71,150
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 88 | 119
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 207,293 | 153,204
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 194,050 | 175,126
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,372,439 | $ 2,090,978
Percentage of total loans | 97.99% | 98.15%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,230,406 | $ 1,035,059
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 386,856 | 322,924
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 523,831 | 455,648
Pass [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,031 | 5,006
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 43,066 | 31,057
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 272,622 | 220,424
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 658,333 | 659,549
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 548,249 | 503,444
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 14,601 | 20,378
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 95,483 | 135,727
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 483,701 | 396,370
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 85,416 | 70,638
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 88 | 119
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 206,259 | 152,496
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 191,938 | 173,117
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 11,753 | $ 9,029
Percentage of total loans | 0.49% | 0.42%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 11,753 | $ 9,029
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,776 | 4,960
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,008 | 341
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,969 | 3,728
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 36,883 | $ 30,362
Percentage of total loans | 1.52% | 1.43%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 28,001 | $ 22,111
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 10,552 | 9,664
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 6,721 | 5,908
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 233 | 171
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 10,495 | 6,368
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,426 | 5,022
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,202 | 4,789
Substandard [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 224 | 233
Substandard [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,456 | 3,229
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 310 | 512
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,034 | 708
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,112 | $ 2,009
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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