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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