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Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 6,640 | $ 9,496
Loans Not Past Due | 2,913,248 | 2,816,206
Total | $ 2,919,888 | $ 2,825,702
Total Past Due, Percentage of Total Loans | 0.23% | 0.34%
Loans Not Past Due, Percentage of Total Loans | 99.77% | 99.66%
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 3,113 | $ 4,749
Loans Not Past Due | 1,665,284 | 1,659,318
Total | 1,668,397 | 1,664,067
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,035 | 3,563
Loans Not Past Due | 590,238 | 568,419
Total | 591,273 | 571,982
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 937 | 634
Loans Not Past Due | 677,976 | 678,311
Total | 678,913 | 678,945
Commercial [Member] | Residential Spec Homes [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 11,614 | 16,431
Total | 11,614 | 16,431
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 31
Loans Not Past Due | 34,384 | 48,807
Total | 34,384 | 48,838
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,141 | 521
Loans Not Past Due | 351,072 | 347,350
Total | 352,213 | 347,871
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,135 | 1,360
Loans Not Past Due | 740,337 | 697,533
Total | 741,472 | 698,893
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,135 | 1,297
Loans Not Past Due | 609,736 | 587,061
Total | 610,871 | 588,358
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 63
Loans Not Past Due | 21,585 | 15,964
Total | 21,585 | 16,027
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 109,016 | 94,508
Total | 109,016 | 94,508
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,392 | 3,387
Loans Not Past Due | 507,627 | 459,355
Total | 510,019 | 462,742
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 104 | 88
Loans Not Past Due | 38,961 | 37,753
Total | 39,065 | 37,841
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,807 | 2,270
Loans Not Past Due | 274,510 | 225,053
Total | 276,317 | 227,323
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 481 | 1,029
Loans Not Past Due | 194,156 | 196,549
Total | 194,637 | 197,578
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 3,978 | $ 6,426
Total Past Due, Percentage of Total Loans | 0.14% | 0.23%
30 - 59 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1,114 | $ 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 | 897 | 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 | 42 | 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 | 175 | 520
30 - 59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 822 | 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 | 822 | 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 | 2,042 | 2,439
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 78 | 78
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,513 | 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 | 451 | 502
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 2,613 | $ 2,903
Total Past Due, Percentage of Total Loans | 0.09% | 0.10%
60 - 89 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1,999 | $ 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 | 138 | 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 | 895 | 122
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 966 | 1
60 - 89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 302 | 49
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 302 | 49
60 - 89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 312 | 781
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 26 | 10
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 256 | 244
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 30 | 527
Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 49 | $ 167
Total Past Due, Percentage of Total Loans | 0.00% | 0.01%
Greater than 90 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 11 |
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 11 |
Greater than 90 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 38 | $ 167
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 38 | $ 167

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