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Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 5,737 | $ 6,556
Loans Not Past Due | 2,135,499 | 2,123,813
Total | $ 2,141,236 | $ 2,130,369
Total Past Due, Percentage of Total Loans | 0.27% | 0.31%
Loans Not Past Due, Percentage of Total Loans | 99.73% | 99.69%
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 2,846 | $ 2,591
Loans Not Past Due | 1,099,795 | 1,063,608
Total | 1,102,641 | 1,066,199
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,523 | 1,251
Loans Not Past Due | 337,818 | 336,297
Total | 339,341 | 337,548
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 195 | 357
Loans Not Past Due | 475,571 | 461,540
Total | 475,766 | 461,897
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 478 |
Loans Not Past Due | 5,959 | 5,006
Total | 6,437 | 5,006
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 85 | 1
Loans Not Past Due | 35,310 | 31,227
Total | 35,395 | 31,228
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 565 | 982
Loans Not Past Due | 245,137 | 229,538
Total | 245,702 | 230,520
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,502 | 1,009
Loans Not Past Due | 618,446 | 663,562
Total | 619,948 | 664,571
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,319 | 1,009
Loans Not Past Due | 507,326 | 507,224
Total | 508,645 | 508,233
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 183 |
Loans Not Past Due | 21,760 | 20,611
Total | 21,943 | 20,611
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 89,360 | 135,727
Total | 89,360 | 135,727
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,389 | 2,956
Loans Not Past Due | 417,258 | 396,643
Total | 418,647 | 399,599
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 28 | 143
Loans Not Past Due | 74,167 | 71,007
Total | 74,195 | 71,150
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 99 | 119
Total | 99 | 119
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 969 | 1,625
Loans Not Past Due | 165,833 | 151,579
Total | 166,802 | 153,204
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 392 | 1,188
Loans Not Past Due | 177,159 | 173,938
Total | 177,551 | 175,126
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 4,918 | $ 5,684
Total Past Due, Percentage of Total Loans | 0.23% | 0.27%
30 - 59 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 2,604 | $ 2,408
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,523 | 1,068
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 | 103 | 357
30 - 59 Days Past Due [Member] | Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 478 |
30 - 59 Days Past Due [Member] | Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 85 | 1
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 415 | 982
30 - 59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,255 | 886
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,072 | 886
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 183 |
30 - 59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,059 | 2,390
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 26 | 139
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 707 | 1,339
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 326 | 912
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 574 | $ 631
Total Past Due, Percentage of Total Loans | 0.03% | 0.03%
60 - 89 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 92 |
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 | 92 |
60 - 89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 247 | $ 123
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 247 | 123
60 - 89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 235 | 508
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2 | 4
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 193 | 237
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 40 | 267
Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 245 | $ 241
Total Past Due, Percentage of Total Loans | 0.01% | 0.01%
Greater than 90 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 150 | $ 183
Greater than 90 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 183
Greater than 90 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 150 |
Greater than 90 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 95 | 58
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 69 | 49
Greater than 90 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 26 | $ 9

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