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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | $ 10,430 | $ 18,893 | $ 9,458 | $ 17,859
Impaired loans with a related allowance, Average Recorded Investment | 12,851 | 12,390 | 16,584 | 13,046
Total impaired loans, Average Recorded Investment | 23,281 | 31,283 | 26,042 | 30,905
Impaired loans with no related allowance, Interest Income Recognized | 17 | 43 | 188 | 809
Impaired loans with a related allowance, Interest Income Recognized | 16 | 33 | 146 | 230
Total impaired loans, Interest Income Recognized | 33 | 76 | 334 | 1,039
Commercial Loans | Construction Development And Other Land |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 6,375 |  | 5,133
Impaired loans with a related allowance, Average Recorded Investment |  | 463 |  | 1,409
Impaired loans with no related allowance, Interest Income Recognized |  | 40 |  | 294
Impaired loans with a related allowance, Interest Income Recognized |  |  |  | 117
Commercial Loans | Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 1,258 |  | 614 | 834
Impaired loans with a related allowance, Average Recorded Investment |  | 5,328 | 2,932 | 4,009
Impaired loans with no related allowance, Interest Income Recognized |  |  | 17 | 11
Impaired loans with a related allowance, Interest Income Recognized |  | 11 | 47 | 11
Commercial Loans | Multi-family Residential |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  |  | 24
Impaired loans with a related allowance, Average Recorded Investment | 5,568 |  | 5,586 | 126
Impaired loans with no related allowance, Interest Income Recognized |  |  |  | 3
Impaired loans with a related allowance, Interest Income Recognized | 1 |  | 23 | 7
Commercial Loans | Single-family Non-owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 321 | 317 | 247 | 1,146
Impaired loans with a related allowance, Average Recorded Investment | 369 | 365 | 370 | 1,064
Impaired loans with no related allowance, Interest Income Recognized | 7 |  | 8 | 93
Impaired loans with a related allowance, Interest Income Recognized | 1 |  | 2 | 12
Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 5,971 | 8,194 | 6,089 | 7,739
Impaired loans with a related allowance, Average Recorded Investment | 4,386 | 606 | 4,404 | 1,791
Impaired loans with no related allowance, Interest Income Recognized |  |  | 89 | 296
Impaired loans with a related allowance, Interest Income Recognized | 6 |  | 31 | 26
Commercial Loans | Farmland Loan |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 667 | 241 | 372
Impaired loans with no related allowance, Interest Income Recognized |  | 3 | 11 | 12
Consumer Real Estate | Home Equity Lines |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  | 546 | 88 | 518
Impaired loans with a related allowance, Average Recorded Investment |  | 535 | 76 | 329
Impaired loans with no related allowance, Interest Income Recognized |  |  | 2 | 25
Impaired loans with a related allowance, Interest Income Recognized |  | 9 | 1 | 3
Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment | 2,880 | 2,794 | 2,179 | 2,069
Impaired loans with a related allowance, Average Recorded Investment | 2,528 | 5,093 | 3,216 | 4,318
Impaired loans with no related allowance, Interest Income Recognized | 10 |  | 61 | 70
Impaired loans with a related allowance, Interest Income Recognized | 8 | 13 | 42 | 54
Consumer Real Estate | Owner occupied construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  |  | 20
Impaired loans with no related allowance, Interest Income Recognized |  |  |  | 5
Consumer and Other | Consumer Loan |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired loans with no related allowance, Average Recorded Investment |  |  |  | $ 4

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