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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,722,478 $ 1,377,472
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 793,003 673,059
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 273,820 228,380
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 314,680 297,299
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,049 2,027
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 18,394 12,097
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 183,060 133,256
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 567,403 383,182
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 408,360 242,521
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 20,069 11,505
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 138,974 129,156
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 362,072 321,231
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 50,410 40,137
Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 171 219
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 153,786 141,868
Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 157,705 139,007
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,689,069 $ 1,335,853
Percentage of total loans 98.06% 96.98%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 769,760 $ 642,026
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 262,753 215,874
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 306,709 283,518
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,049 2,027
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 18,323 12,018
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 178,926 128,589
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 561,088 377,288
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 402,299 236,893
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 19,815 11,239
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 138,974 129,156
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 358,221 316,538
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 49,802 39,900
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 171 219
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 153,128 141,264
Pass [Member] | Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 155,120 135,155
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 7,336 $ 13,959
Percentage of total loans 0.43% 1.01%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 7,336 $ 13,959
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 4,080 7,623
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,657 4,458
Special Mention [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 71 79
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,528 1,799
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 26,073 $ 27,661
Percentage of total loans 1.51% 2.01%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 15,907 $ 17,074
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,987 4,883
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,314 9,323
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,606 2,868
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,315 5,894
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,061 5,628
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 254 266
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,851 4,693
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 608 237
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 658 604
Substandard [Member] | Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,585 $ 3,852
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%