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Non-performing Assets and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 5,039 | $ 5,197
Loans Not Past Due | 1,740,301 | 1,372,275
Total | $ 1,745,340 | $ 1,377,472
Total Past Due, Percentage of Total Loans | 0.29% | 0.38%
Loans Not Past Due, Percentage of Total Loans | 99.71% | 99.62%
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 580 | $ 1,181
Loans Not Past Due | 802,212 | 671,878
Total | 802,792 | 673,059
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 499 | 748
Loans Not Past Due | 267,782 | 227,632
Total | 268,281 | 228,380
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 49 | 413
Loans Not Past Due | 326,350 | 296,886
Total | 326,399 | 297,299
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 5,018 | 2,027
Total | 5,018 | 2,027
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 18,183 | 12,097
Total | 18,183 | 12,097
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 32 | 20
Loans Not Past Due | 184,879 | 133,236
Total | 184,911 | 133,256
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,466 | 1,266
Loans Not Past Due | 577,901 | 381,916
Total | 579,367 | 383,182
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,466 | 1,266
Loans Not Past Due | 413,458 | 241,255
Total | 414,924 | 242,521
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 19,751 | 11,505
Total | 19,751 | 11,505
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 144,692 | 129,156
Total | 144,692 | 129,156
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,993 | 2,750
Loans Not Past Due | 360,188 | 318,481
Total | 363,181 | 321,231
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 116 | 127
Loans Not Past Due | 54,225 | 40,010
Total | 54,341 | 40,137
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Not Past Due | 153 | 219
Total | 153 | 219
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,481 | 1,332
Loans Not Past Due | 150,042 | 140,536
Total | 151,523 | 141,868
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,396 | 1,291
Loans Not Past Due | 155,768 | 137,716
Total | 157,164 | 139,007
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 4,168 | $ 3,807
Total Past Due, Percentage of Total Loans | 0.24% | 0.28%
30 - 59 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 562 | $ 535
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 481 | 103
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 | 413
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 32 | 19
30 - 59 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,121 | 1,033
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,121 | 1,033
30 - 59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,485 | 2,239
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 106 | 113
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,186 | 1,042
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,193 | 1,084
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 843 | $ 1,275
Total Past Due, Percentage of Total Loans | 0.05% | 0.09%
60 - 89 Days Past Due [Member] | Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 18 | $ 646
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 18 | 645
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 1
60 - 89 Days Past Due [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 344 | 193
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 344 | 193
60 - 89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 481 | 436
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 10 | 4
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 268 | 243
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 203 | 189
Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 28 | $ 115
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 | $ 1 | $ 40
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 | 40
Greater than 90 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 27 | 75
Greater than 90 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 10
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 27 | 47
Greater than 90 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | $ 18

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