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Note 5 - Loans (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset | $ 356,700,000 |  |
Impaired Financing Receivable, Recorded Investment | 133,810,000 | $ 174,519,000 |
Impaired Financing Receivable, Average Recorded Investment | 162,945,000 | 190,226,000 | $ 221,152,000
Impaired Financing Receivable, Interest Income, Accrual Method | $ 3,997,000 | $ 5,339,000 | 5,599,000
Percentage of Charge-off to Contractual Balances for Impaired Loans | 22.40% | 17.10% |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  |
Nonaccrual Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 52,100,000 | $ 70,200,000 |
Financing Receivable, Modifications, Recorded Investment | 39,900,000 | 41,600,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 2,000,000 | 4,900,000 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 81,700,000 | 104,300,000 |
Financing Receivable, Modifications, Recorded Investment | 81,700,000 | 104,300,000 |
Allowance for Credit Losses, Change in Method of Calculating Impairment | $ 5,400,000 | $ 6,500,000 |
Financing Receivable, Modifications, Number of Contracts | 59 | 60 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 22,700,000 |  |
Real Estate Loan [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 6,800,000,000 | $ 3,800,000,000 |
Commercial Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Loans Pledged With Federal Reserve Bank | 71,300,000 | 127,200,000 |
Commercial Portfolio Segment [Member] | Non-Farm, Non-Residential [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,000,000 |  |
Residential Portfolio Segment [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset | 138,000,000 |  |
Repossessed Assets | 2,000,000 | 2,300,000 |
Residential Portfolio Segment [Member] | Single Family Residential Loan [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 9,400,000 |  |
Financing Receivable, Modifications, Number of Contracts | 32 |  |
Residential Portfolio Segment [Member] | Multi Family Residences [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 6,100,000 |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset | $ 90,900,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 100,118,000 | $ 114,248,000 | 138,121,000
Impaired Financing Receivable, Interest Income, Accrual Method | 2,708,000 | 3,735,000 | 4,256,000
Commercial Real Estate Portfolio Segment [Member] | Non-Farm, Non-Residential [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 44,900,000 |  |
Financing Receivable, Modifications, Number of Contracts | 15 |  |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loan [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 5,700,000 | $ 13,600,000 |
Financing Receivable, Modifications, Number of Contracts | 4 | 31 |
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residences [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 6,000,000 |  |
Financing Receivable, Modifications, Number of Contracts | 1 |  |
Commercial Real Estate Portfolio Segment [Member] | Hotel Loan [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 15,700,000 |
Financing Receivable, Modifications, Number of Contracts |  | 3 |
Commercial Real Estate Portfolio Segment [Member] | Industrial and Manufactural Building Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 12,200,000 |
Financing Receivable, Modifications, Number of Contracts |  | 2 |
Commercial Real Estate Portfolio Segment [Member] | Residential Vacant Land Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 10,200,000 |
Financing Receivable, Modifications, Number of Contracts |  | 2 |
Commercial Real Estate Portfolio Segment [Member] | Condominium [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 10,100,000 |
Financing Receivable, Modifications, Number of Contracts |  | 4 |
Commercial Real Estate Portfolio Segment [Member] | Retail Shopping and Commercial Use Building [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 9,000,000 |
Financing Receivable, Modifications, Number of Contracts |  | 3 |
Commercial Real Estate Portfolio Segment [Member] | Office and Commercial Use Building [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 3,500,000 |
Financing Receivable, Modifications, Number of Contracts |  | 3 |
Commercial Real Estate Portfolio Segment [Member] | Warehouse Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 1,600,000 |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Commercial Construction Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset | $ 77,300,000 |  |
Commercial Portfolio Segment [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset | 50,500,000 |  |
Impaired Financing Receivable, Average Recorded Investment | 23,960,000 | $ 26,128,000 | 27,123,000
Impaired Financing Receivable, Interest Income, Accrual Method | $ 546,000 | 878,000 | 770,000
Commercial Portfolio Segment [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 16,500,000 |
Financing Receivable, Modifications, Number of Contracts |  | 9 |
Commercial Portfolio Segment [Member] | Non-Farm, Non-Residential [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 6 |  |
Real Estate Construction Portfolio Segment [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 22,066,000 | $ 32,439,000 | 37,875,000
Impaired Financing Receivable, Interest Income, Accrual Method | 261,000 | 264,000 | $ 284,000
Real Estate Construction Portfolio Segment [Member] | Construction [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 5,700,000 |  |
Financing Receivable, Modifications, Number of Contracts | 1 |  |
Real Estate Construction Portfolio Segment [Member] | Shopping Center Construction Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 5,800,000 |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Minimum [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Period Loan is in Payment Default | 60 days |  |
Maximum [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Period Loan is in Payment Default | 90 days |  |

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