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Recorded Investment Unpaid Principal Balance and Related Allowance for Loans losses Excluding Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | $ 22,074 | $ 25,402
Impaired loans with a related allowance, Recorded Investment |  | 4,899 | 11,534
Total impaired loans, Recorded Investment | [1] | 26,973 | 36,936
Impaired loans with no related allowance, Unpaid Principal balance |  | 24,133 | 27,005
Impaired loans with a related allowance, Unpaid Principal Balance |  | 4,955 | 11,558
Total impaired loans, Unpaid Principal Balance | [1] | 29,088 | 38,563
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  | 819 | 2,371
Total impaired loans, Related Allowance | [1] | 819 | 2,371
Commercial Loans | Multi-family Residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 294 | 84
Impaired loans with no related allowance, Unpaid Principal balance |  | 369 | 94
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 3,084 | 2,095
Impaired loans with a related allowance, Recorded Investment |  | 351 | 619
Impaired loans with no related allowance, Unpaid Principal balance |  | 3,334 | 2,239
Impaired loans with a related allowance, Unpaid Principal Balance |  | 351 | 623
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  | 31 | 124
Commercial Loans | Non-farm, Non-residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 3,829 | 10,369
Impaired loans with a related allowance, Recorded Investment |  |  | 5,667
Impaired loans with no related allowance, Unpaid Principal balance |  | 4,534 | 11,055
Impaired loans with a related allowance, Unpaid Principal Balance |  |  | 5,673
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  |  | 1,568
Commercial Loans | Farmland Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 1,161 | 310
Impaired loans with a related allowance, Recorded Investment |  | 430 |
Impaired loans with no related allowance, Unpaid Principal balance |  | 1,188 | 326
Impaired loans with a related allowance, Unpaid Principal Balance |  | 430 |
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  | 18 |
Commercial Loans | Construction Development And Other Land |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 33 | 57
Impaired loans with no related allowance, Unpaid Principal balance |  | 35 | 57
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Commercial Loans | Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 346 | 16
Impaired loans with no related allowance, Unpaid Principal balance |  | 383 | 23
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Commercial Loans | Agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 11,779 | 11,289
Impaired loans with a related allowance, Recorded Investment |  | 4,118 | 4,899
Impaired loans with no related allowance, Unpaid Principal balance |  | 12,630 | 11,996
Impaired loans with a related allowance, Unpaid Principal Balance |  | 4,174 | 4,907
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  | 770 | 672
Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 573 | 243
Impaired loans with a related allowance, Recorded Investment |  |  | 349
Impaired loans with no related allowance, Unpaid Principal balance |  | 589 | 243
Impaired loans with a related allowance, Unpaid Principal Balance |  |  | 355
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Impaired loans with a related allowance, Related Allowance |  |  | 7
Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 913 | 868
Impaired loans with no related allowance, Unpaid Principal balance |  | 968 | 898
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Consumer and Other Loans | Consumer Loan |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment |  | 62 | 71
Impaired loans with no related allowance, Unpaid Principal balance |  | 103 | 74
Impaired loans with no related allowance, Related Allowance |  | 0 | 0
Consumer and Other Loans | Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired loans with no related allowance, Related Allowance |  | $ 0 | $ 0
[1] | Includes loans totaling $16.89 million as of December 31, 2016, and $14.22 million as of December 31, 2015, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment

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