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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, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 2,149 | $ 5,039
Loans Not Past Due | 1,714,511 | 1,740,301
Total | $ 1,716,660 | $ 1,745,340
Total Past Due, Percentage of Total Loans | 0.13% | 0.29%
Loans Not Past Due, Percentage of Total Loans | 99.87% | 99.71%
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 339 | $ 580
Loans Not Past Due | 795,362 | 802,212
Total | 795,701 | 802,792
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 319 | 499
Loans Not Past Due | 264,580 | 267,782
Total | 264,899 | 268,281
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 49
Loans Not Past Due | 324,824 | 326,350
Total | 324,824 | 326,399
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 7,011 | 5,018
Total | 7,011 | 5,018
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 19,961 | 18,183
Total | 19,961 | 18,183
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 20 | 32
Loans Not Past Due | 178,986 | 184,879
Total | 179,006 | 184,911
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 499 | 1,466
Loans Not Past Due | 559,819 | 577,901
Total | 560,318 | 579,367
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 499 | 1,466
Loans Not Past Due | 420,923 | 413,458
Total | 421,422 | 414,924
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 19,020 | 19,751
Total | 19,020 | 19,751
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 119,876 | 144,692
Total | 119,876 | 144,692
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,311 | 2,993
Loans Not Past Due | 359,330 | 360,188
Total | 360,641 | 363,181
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 60 | 116
Loans Not Past Due | 56,707 | 54,225
Total | 56,767 | 54,341
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 140 | 153
Total | 140 | 153
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 562 | 1,481
Loans Not Past Due | 147,012 | 150,042
Total | 147,574 | 151,523
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 689 | 1,396
Loans Not Past Due | 155,471 | 155,768
Total | 156,160 | 157,164
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1,794 | $ 4,168
Total Past Due, Percentage of Total Loans | 0.10% | 0.24%
30 - 59 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 161 | $ 562
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 161 | 481
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 |  | 49
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 32
30 - 59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 498 | 1,121
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 498 | 1,121
30 - 59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,135 | 2,485
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 51 | 106
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 412 | 1,186
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 672 | 1,193
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 354 | $ 843
Total Past Due, Percentage of Total Loans | 0.02% | 0.05%
60 - 89 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 178 | $ 18
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 158 | 18
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 20 |
60 - 89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 344
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 344
60 - 89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 176 | 481
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9 | 10
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 150 | 268
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 17 | 203
Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1 | $ 28
Total Past Due, Percentage of Total Loans | 0.00% | 0.00%
Greater than 90 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1 | $ 1
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 1 | 1
Greater than 90 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 27
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | $ 27

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