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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,262,433 $ 2,130,369
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,139,977 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 341,192 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 489,978 461,897
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,454 5,006
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 38,139 31,228
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 267,214 230,520
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 670,812 664,571
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 529,632 508,233
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 17,423 20,611
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 123,757 135,727
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 451,644 399,599
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 80,972 71,150
Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 94 119
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 186,837 153,204
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 183,741 175,126
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,221,880 $ 2,090,978
Percentage of total loans 98.21% 98.15%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,108,193 $ 1,035,059
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 329,160 322,924
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 484,025 455,648
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,454 5,006
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 37,884 31,057
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 253,670 220,424
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 665,527 659,549
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 524,573 503,444
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 17,197 20,378
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 123,757 135,727
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 448,160 396,370
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 80,477 70,638
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 94 119
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 185,807 152,496
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 181,782 173,117
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 5,683 $ 9,029
Percentage of total loans 0.25% 0.42%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 5,683 $ 9,029
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,503 4,960
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 450 341
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,730 3,728
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 34,870 $ 30,362
Percentage of total loans 1.54% 1.43%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 26,101 $ 22,111
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,529 9,664
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,503 5,908
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 255 171
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 9,814 6,368
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,285 5,022
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,059 4,789
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 226 233
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,484 3,229
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 495 512
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,030 708
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,959 $ 2,009
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%