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Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,518,464 $ 1,377,472
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 708,776 673,059
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 238,883 228,380
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 313,871 297,299
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,606 2,027
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 13,593 12,097
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 139,823 133,256
Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 472,806 383,182
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 257,795 242,521
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 19,087 11,505
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 195,924 129,156
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 336,882 321,231
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 44,119 40,137
Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 179 219
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 152,268 141,868
Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 140,316 139,007
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 1,480,437 $ 1,335,854
Percentage of total loans 97.50% 96.98%
Pass [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 680,416 $ 642,027
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 224,414 215,875
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 303,292 283,518
Pass [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,606 2,027
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 13,520 12,018
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 136,586 128,589
Pass [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 466,987 377,288
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 252,234 236,893
Pass [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 18,829 11,239
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 195,924 129,156
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 333,034 316,538
Pass [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 43,672 39,900
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 179 219
Pass [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 151,863 141,264
Pass [Member] | Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 137,320 135,155
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 9,805 $ 13,959
Percentage of total loans 0.65% 1.01%
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 9,805 $ 13,959
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,299 7,623
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,442 4,458
Special Mention [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 73 79
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 991 1,799
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 28,220 $ 27,661
Percentage of total loans 1.86% 2.01%
Substandard [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 18,553 $ 17,074
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 8,170 4,883
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 8,137 9,323
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,246 2,868
Substandard [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,819 5,894
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,561 5,628
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 258 266
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 3,848 4,693
Substandard [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 447 237
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 405 604
Substandard [Member] | Consumer [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 2,996 $ 3,852
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total loans 0.00% 0.00%