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Investment in Loans Related to Each Segment (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | $ 27,144 | $ 23,202
Allowance for Loans Individually Evaluated | 5,256 | 5,593
Loans Collectively Evaluated for Impairment | 1,579,120 | 1,562,360
Allowance for Loans Collectively Evaluated | 18,366 | 20,169
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 18,706 | 17,753
Allowance for Loans Individually Evaluated | 4,040 | 4,564
Loans Collectively Evaluated for Impairment | 842,772 | 833,652
Allowance for Loans Collectively Evaluated | 12,017 | 12,695
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 4,688 | 2,916
Allowance for Loans Individually Evaluated | 347 |
Loans Collectively Evaluated for Impairment | 61,896 | 55,369
Allowance for Loans Collectively Evaluated | 1,476 | 1,214
Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 4,743 | 3,602
Allowance for Loans Individually Evaluated | 3,648 | 3,192
Loans Collectively Evaluated for Impairment | 93,951 | 88,811
Allowance for Loans Collectively Evaluated | 1,462 | 1,159
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment |  | 378
Allowance for Loans Individually Evaluated |  | 18
Loans Collectively Evaluated for Impairment | 57,555 | 67,278
Allowance for Loans Collectively Evaluated | 1,008 | 1,612
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 602 | 2,794
Allowance for Loans Individually Evaluated | 38 | 996
Loans Collectively Evaluated for Impairment | 133,191 | 134,323
Allowance for Loans Collectively Evaluated | 3,363 | 3,371
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 8,014 | 8,063
Allowance for Loans Individually Evaluated | 7 | 358
Loans Collectively Evaluated for Impairment | 461,592 | 451,240
Allowance for Loans Collectively Evaluated | 4,399 | 4,901
Commercial Loans | Agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 2,450 | 1,852
Allowance for Loans Collectively Evaluated | 19 | 22
Commercial Loans | Farmland Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 659 |
Loans Collectively Evaluated for Impairment | 32,137 | 34,779
Allowance for Loans Collectively Evaluated | 290 | 416
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 8,438 | 5,449
Allowance for Loans Individually Evaluated | 1,216 | 1,029
Loans Collectively Evaluated for Impairment | 659,889 | 642,005
Allowance for Loans Collectively Evaluated | 5,700 | 6,877
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 1,060 | 499
Allowance for Loans Individually Evaluated | 434 | 223
Loans Collectively Evaluated for Impairment | 135,868 | 141,684
Allowance for Loans Collectively Evaluated | 1,267 | 1,351
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Non-acquired Loans Individually Evaluated for Impairment | 7,378 | 4,950
Allowance for Loans Individually Evaluated | 782 | 806
Loans Collectively Evaluated for Impairment | 498,208 | 483,553
Allowance for Loans Collectively Evaluated | 4,230 | 5,189
Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 25,813 | 16,768
Allowance for Loans Collectively Evaluated | 203 | 337
Consumer and Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 76,459 | 86,703
Allowance for Loans Collectively Evaluated | 649 | 597
Consumer and Other | Consumer Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | 71,751 | 81,037
Allowance for Loans Collectively Evaluated | 649 | 597
Consumer and Other | Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Collectively Evaluated for Impairment | $ 4,708 | $ 5,666

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