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Non-performing Assets and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 2,998,940 $ 2,817,688
Total Past Due 12,605 14,289
Loans Not Past Due 17,831 23,785
Total $ 3,016,771 $ 2,841,473
Total Past Due, Percentage of Total Loans 0.42% 0.50%
Loans Not Past Due, Percentage of Total Loans 0.59% 0.84%
Current,Percentage of total loans 99.41% 99.16%
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 1,715,104 $ 1,663,493
Total Past Due 6,586 7,353
Loans Not Past Due 10,265 12,102
Total 1,725,369 1,675,595
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 556,516 567,571
Total Past Due 3,413 4,888
Loans Not Past Due 4,947 8,451
Total 561,463 576,022
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 716,574 682,712
Total Past Due 1,046 555
Loans Not Past Due 1,240 1,189
Total 717,814 683,901
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 4,707 16,591
Loans Not Past Due 492  
Total 5,199 16,591
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 46,479 49,789
Total Past Due 68 176
Loans Not Past Due 68 207
Total 46,547 49,996
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 390,828 346,830
Total Past Due 2,059 1,734
Loans Not Past Due 3,518 2,255
Total 394,346 349,085
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 739,650 701,218
Total Past Due 3,269 4,044
Loans Not Past Due 4,636 5,404
Total 744,286 706,622
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 641,500 590,746
Total Past Due 3,269 4,044
Loans Not Past Due 4,636 5,341
Total 646,136 596,087
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 24,030 15,964
Loans Not Past Due   63
Total 24,030 16,027
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 74,120 94,508
Total 74,120 94,508
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 544,186 452,977
Total Past Due 2,750 2,892
Loans Not Past Due 2,930 6,279
Total 547,116 459,256
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 38,138 36,489
Total Past Due 35 160
Loans Not Past Due 35 248
Total 38,173 36,737
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 313,088 224,348
Total Past Due 916 1,041
Loans Not Past Due 1,089 3,311
Total 314,177 227,659
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 192,960 192,140
Total Past Due 1,799 1,691
Loans Not Past Due 1,806 2,720
Total 194,766 194,860
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 5,100 $ 6,426
Total Past Due, Percentage of Total Loans 0.17% 0.23%
30 - 59 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,719 $ 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 537 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 175 512
30 - 59 Days Past Due [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 492  
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 515 520
30 - 59 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,131 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 1,131 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   63
30 - 59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,250 2,439
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 93 78
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,396 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 761 502
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 2,061 $ 2,903
Total Past Due, Percentage of Total Loans 0.07% 0.10%
60 - 89 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,752 $ 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 997 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 19 122
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 736 1
60 - 89 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 56 49
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 56 49
60 - 89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 253 781
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 18 10
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 198 244
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 37 527
Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 568 $ 167
Total Past Due, Percentage of Total Loans 0.02% 0.01%
Greater than 90 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 208  
Greater than 90 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 208  
Greater than 90 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 180  
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 180  
Greater than 90 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 180 $ 167
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 173 $ 167
Greater than 90 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 7