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Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 4,715 $ 6,556
Loans Not Past Due 2,257,718 2,123,813
Total $ 2,262,433 $ 2,130,369
Total Past Due, Percentage of Total Loans 0.21% 0.31%
Loans Not Past Due, Percentage of Total Loans 99.79% 99.69%
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,708 $ 2,591
Loans Not Past Due 1,138,269 1,063,608
Total 1,139,977 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,384 1,251
Loans Not Past Due 339,808 336,297
Total 341,192 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 20 357
Loans Not Past Due 489,958 461,540
Total 489,978 461,897
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 3,454 5,006
Total 3,454 5,006
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   1
Loans Not Past Due 38,139 31,227
Total 38,139 31,228
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 304 982
Loans Not Past Due 266,910 229,538
Total 267,214 230,520
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,043 1,009
Loans Not Past Due 669,769 663,562
Total 670,812 664,571
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,043 1,009
Loans Not Past Due 528,589 507,224
Total 529,632 508,233
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 17,423 20,611
Total 17,423 20,611
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 123,757 135,727
Total 123,757 135,727
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,964 2,956
Loans Not Past Due 449,680 396,643
Total 451,644 399,599
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 173 143
Loans Not Past Due 80,799 71,007
Total 80,972 71,150
Consumer [Member] | Direct Installment Purchased [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 94 119
Total 94 119
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 978 1,625
Loans Not Past Due 185,859 151,579
Total 186,837 153,204
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 813 1,188
Loans Not Past Due 182,928 173,938
Total 183,741 175,126
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 3,817 $ 5,684
Total Past Due, Percentage of Total Loans 0.17% 0.27%
30 - 59 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,302 $ 2,408
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,254 1,068
30 - 59 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 20 357
30 - 59 Days Past Due [Member] | Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   1
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 28 982
30 - 59 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,043 886
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,043 886
30 - 59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,472 2,390
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 127 139
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 790 1,339
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 555 912
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 738 $ 631
Total Past Due, Percentage of Total Loans 0.03% 0.03%
60 - 89 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 406  
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 130  
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 276  
60 - 89 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   $ 123
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   123
60 - 89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 332 508
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 46 4
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 115 237
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 171 267
Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 160 $ 241
Total Past Due, Percentage of Total Loans 0.01% 0.01%
Greater than 90 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   $ 183
Greater than 90 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   183
Greater than 90 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 160 58
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 73 49
Greater than 90 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 87 $ 9