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Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 8,116 $ 9,496
Loans Not Past Due 2,953,365 2,828,792
Total $ 2,961,481 $ 2,838,288
Total Past Due, Percentage of Total Loans 0.27% 0.33%
Loans Not Past Due, Percentage of Total Loans 99.73% 99.67%
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 2,641 $ 4,749
Loans Not Past Due 1,700,198 1,670,640
Total 1,702,839 1,675,389
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 506 3,563
Loans Not Past Due 582,755 572,253
Total 583,261 575,816
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 404 634
Loans Not Past Due 703,880 683,267
Total 704,284 683,901
Commercial [Member] | Residential Spec Homes [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 7,254 16,591
Total 7,254 16,591
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   31
Loans Not Past Due 43,889 49,965
Total 43,889 49,996
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,731 521
Loans Not Past Due 362,420 348,564
Total 364,151 349,085
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,063 1,360
Loans Not Past Due 721,708 702,283
Total 724,771 703,643
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,940 1,297
Loans Not Past Due 628,015 591,811
Total 630,955 593,108
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 123 63
Loans Not Past Due 22,271 15,964
Total 22,394 16,027
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Not Past Due 71,422 94,508
Total 71,422 94,508
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,412 3,387
Loans Not Past Due 531,459 455,869
Total 533,871 459,256
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 87 88
Loans Not Past Due 37,808 36,649
Total 37,895 36,737
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,398 2,270
Loans Not Past Due 302,181 225,389
Total 303,579 227,659
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 927 1,029
Loans Not Past Due 191,470 193,831
Total 192,397 194,860
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 6,878 $ 6,426
Total Past Due, Percentage of Total Loans 0.23% 0.23%
30 - 59 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 2,206 $ 2,676
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 448 1,613
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 370 512
30 - 59 Days Past Due [Member] | Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   31
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,388 520
30 - 59 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,765 1,311
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,642 1,248
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 123 63
30 - 59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,907 2,439
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 67 78
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,025 1,859
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 815 502
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,036 $ 2,903
Total Past Due, Percentage of Total Loans 0.03% 0.10%
60 - 89 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 435 $ 2,073
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 58 1,950
60 - 89 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 34 122
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 343 1
60 - 89 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 156 49
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 156 49
60 - 89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 445 781
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 20 10
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 313 244
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 112 527
Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 202 $ 167
Total Past Due, Percentage of Total Loans 0.01% 0.01%
Greater than 90 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 142  
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 142  
Greater than 90 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 60 $ 167
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 60 $ 167