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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 |

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