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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

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