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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | $ 280,226 | $ 315,433
Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 9,813 | 11,348
Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 53,535 | 61,599
Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 20,459 | 22,095
Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 112,512 | 122,430
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 18,216 | 37,772
Impaired Loans with No Related Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 7,770 | 18,124
Unpaid Principal Balance | 7,770 | 18,124
Impaired Loans with No Related Allowance Recorded [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 1,445 | 4,590
Unpaid Principal Balance | 1,445 | 4,590
Impaired Loans with No Related Allowance Recorded [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 96 | 103
Unpaid Principal Balance | 96 | 103
Impaired Loans with No Related Allowance Recorded [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 1,053
Unpaid Principal Balance |  | 1,053
Impaired Loans with No Related Allowance Recorded [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 6,229 | 11,844
Unpaid Principal Balance | 6,229 | 11,844
Impaired Loans with No Related Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 534
Unpaid Principal Balance |  | 534
Impaired Loans with an Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 3,378 | 14,661
Unpaid Principal Balance | 3,378 | 14,661
Related Allowances | 1,329 | 3,302
Impaired Loans with an Allowance Recorded [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 604 | 1,407
Unpaid Principal Balance | 604 | 1,407
Related Allowances | 71 | 232
Impaired Loans with an Allowance Recorded [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 185
Unpaid Principal Balance |  | 185
Related Allowances |  | 11
Impaired Loans with an Allowance Recorded [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 2,774 | 6,474
Unpaid Principal Balance | 2,774 | 6,474
Related Allowances | 1,258 | 2,005
Impaired Loans with an Allowance Recorded [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 6,376
Unpaid Principal Balance |  | 6,376
Related Allowances |  | 835
Impaired Loans with an Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 219
Unpaid Principal Balance |  | 219
Related Allowances |  | 219
Impaired Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 11,148 | 32,785
Unpaid Principal Balance | 11,148 | 32,785
Related Allowances | 1,329 | 3,302
Impaired Loans [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 2,049 | 5,997
Unpaid Principal Balance | 2,049 | 5,997
Related Allowances | 71 | 232
Impaired Loans [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 96 | 288
Unpaid Principal Balance | 96 | 288
Related Allowances |  | 11
Impaired Loans [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 2,774 | 7,527
Unpaid Principal Balance | 2,774 | 7,527
Related Allowances | 1,258 | 2,005
Impaired Loans [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount | 6,229 | 18,220
Unpaid Principal Balance | 6,229 | 18,220
Related Allowances |  | 835
Impaired Loans [Member] | Commercial and Industrial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Carrying Amount |  | 753
Unpaid Principal Balance |  | 753
Related Allowances |  | $ 219

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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