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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,141,236 | $ 2,130,369
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,102,641 | 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 339,341 | 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 475,766 | 461,897
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 6,437 | 5,006
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35,395 | 31,228
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 245,702 | 230,520
Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 619,948 | 664,571
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 508,645 | 508,233
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 21,943 | 20,611
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 89,360 | 135,727
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 418,647 | 399,599
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 74,195 | 71,150
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 99 | 119
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 166,802 | 153,204
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 177,551 | 175,126
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 2,100,127 | $ 2,090,978
Percentage of total loans | 98.08% | 98.15%
Pass [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,069,836 | $ 1,035,059
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 324,596 | 322,924
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 469,602 | 455,648
Pass [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 6,437 | 5,006
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35,213 | 31,057
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 233,988 | 220,424
Pass [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 614,891 | 659,549
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 503,818 | 503,444
Pass [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 21,713 | 20,378
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 89,360 | 135,727
Pass [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 415,400 | 396,370
Pass [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 73,706 | 70,638
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 99 | 119
Pass [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 166,043 | 152,496
Pass [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 175,552 | 173,117
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 9,565 | $ 9,029
Percentage of total loans | 0.45% | 0.42%
Special Mention [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 9,565 | $ 9,029
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,311 | 4,960
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 338 | 341
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,916 | 3,728
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 31,544 | $ 30,362
Percentage of total loans | 1.47% | 1.43%
Substandard [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 23,240 | $ 22,111
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 10,434 | 9,664
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,826 | 5,908
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 182 | 171
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 6,798 | 6,368
Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,057 | 5,022
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,827 | 4,789
Substandard [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 230 | 233
Substandard [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,247 | 3,229
Substandard [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 489 | 512
Substandard [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 759 | 708
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 1,999 | $ 2,009
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Percentage of total loans | 0.00% | 0.00%

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