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Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 10,828 | $ 9,748
Loans Past Due Over 90 Days Still Accruing | 62 | 49
Non Performing TDRs |  | 3,426
Performing TDRs | 3,469 | 5,054
Total Non-Performing Loans | 14,359 | 18,277
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,853 | 4,014
Loans Past Due Over 90 Days Still Accruing |  | 45
Non Performing TDRs |  | 2,116
Performing TDRs | 3,469 | 1,296
Total Non-Performing Loans | 9,322 | 7,471
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,715 | 293
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  | 222
Performing TDRs | 781 | 778
Total Non-Performing Loans | 3,496 | 1,293
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,591 | 2,289
Loans Past Due Over 90 Days Still Accruing |  | 45
Non Performing TDRs |  | 1,117
Performing TDRs | 1,563 | 518
Total Non-Performing Loans | 4,154 | 3,969
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  |
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans |  |
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  | 182
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans |  | 182
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 547 | 1,250
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  | 777
Performing TDRs | 1,125 |
Total Non-Performing Loans | 1,672 | 2,027
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,471 | 2,459
Loans Past Due Over 90 Days Still Accruing |  | 2
Non Performing TDRs |  | 999
Performing TDRs |  | 2,686
Total Non-Performing Loans | 2,471 | 6,146
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,471 | 2,459
Loans Past Due Over 90 Days Still Accruing |  | 2
Non Performing TDRs |  | 719
Performing TDRs |  | 2,686
Total Non-Performing Loans | 2,471 | 5,866
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  |
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  | 280
Performing TDRs |  |
Total Non-Performing Loans |  | 280
Real Estate [Member] | Mortgage Warehousing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  |
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans |  |
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,504 | 3,275
Loans Past Due Over 90 Days Still Accruing | 62 | 2
Non Performing TDRs |  | 311
Performing TDRs |  | 1,072
Total Non-Performing Loans | 2,566 | 4,660
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 259 | 202
Loans Past Due Over 90 Days Still Accruing | 3 |
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans | 262 | 202
Consumer [Member] | Direct Installment Purchased [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  |
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans |  |
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 539 | 531
Loans Past Due Over 90 Days Still Accruing | 59 | 2
Non Performing TDRs |  |
Performing TDRs |  |
Total Non-Performing Loans | 598 | 533
Consumer [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,706 | 2,542
Loans Past Due Over 90 Days Still Accruing |  |
Non Performing TDRs |  | 311
Performing TDRs |  | 1,072
Total Non-Performing Loans | $ 1,706 | $ 3,925

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