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Note 11 - Fair Value of Financial Instruments (Details) - Quantitative Information About Non-Recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Fair value-Recurring (in Dollars) $ 1,008,545,000 $ 973,394,000
Liabilities:    
Fair value-Recurring (in Dollars) 5,030,885,000 4,620,766,000
Assets:    
Fair value-Capitalization Rate (in Dollars) $ 20,273 28,500
Discount rate-Capitalization Rate (1.30%)  
Discount rate-loss severity discount 1.30%  
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 20,273 28,500
Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Fair value-Recurring (in Dollars) $ 7,181,000 $ 7,090,000
Junior Subordinated Debentures [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring 7.00% 7.00%
Discount rate-Recurring (7.00%) (7.00%)
Liabilities:    
Fair value-Recurring (in Dollars) $ 28,491,000 $ 28,771,000
Discount rate-Recurring 7.00% 7.00%
Discount rate-Recurring (7.00%) (7.00%)
Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Fair value-Recurring (in Dollars)   $ 15,519,000
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) $ 3,890,000 6,981,000
Assets:    
Fair value-Comparability adjustments (in Dollars) 3,890,000 6,981,000
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) 5,534,000 6,935,000
Assets:    
Fair value-Comparability adjustments (in Dollars) 5,534,000 6,935,000
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) 5,994,000 8,258,000
Assets:    
Fair value-Comparability adjustments (in Dollars) 5,994,000 8,258,000
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) $ 3,750,000 4,768,000
Discount rate-Capitalization Rate 9.00%  
Discount rate-Capitalization Rate (1.60%)  
Discount rate-loss severity discount 1.60%  
Discount rate-loss severity discount (9.00%)  
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 3,750,000 4,768,000
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) $ 289,000 587,000
Discount rate-Capitalization Rate 8.60%  
Discount rate-loss severity discount (8.60%)  
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 289,000 587,000
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Capitalization Rate (in Dollars) 816,000 971,000
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 816,000 $ 971,000
Loans Held for Sale [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (19.00%)  
Discount rate-loss severity discount 19.00%  
Minimum [Member] | Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring 7.00% 7.00%
Discount rate-Recurring (7.00%) (7.00%)
Liabilities:    
Discount rate-Recurring 7.00% 7.00%
Discount rate-Recurring (7.00%) (7.00%)
Minimum [Member] | Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring   0.20%
Discount rate-Recurring   (0.20%)
Liabilities:    
Discount rate-Recurring   0.20%
Discount rate-Recurring   (0.20%)
Minimum [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate 6.00% 7.30%
Discount rate-Capitalization Rate (0.50%) (0.50%)
Discount rate-loss severity discount 0.50% 0.50%
Discount rate-loss severity discount (6.00%) (7.30%)
Minimum [Member] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (0.20%) (1.80%)
Discount rate-loss severity discount 0.20% 1.80%
Assets:    
Discount rate-Comparability adjustments (50.00%) (41.50%)
Discount rate-Comparability adjustments 50.00% 41.50%
Minimum [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate 5.60% 5.80%
Discount rate-Capitalization Rate (0.90%) (0.90%)
Discount rate-loss severity discount 0.90% 0.90%
Discount rate-loss severity discount (5.60%) (5.80%)
Assets:    
Discount rate-Comparability adjustments (50.00%) (55.00%)
Discount rate-Comparability adjustments 50.00% 55.00%
Minimum [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   9.00%
Discount rate-Capitalization Rate   (0.90%)
Discount rate-loss severity discount   0.90%
Discount rate-loss severity discount   (9.00%)
Minimum [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   (0.00%)
Discount rate-loss severity discount   0.00%
Assets:    
Discount rate-Comparability adjustments (5.00%) (11.90%)
Discount rate-Comparability adjustments 5.00% 11.90%
Minimum [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   7.50%
Discount rate-Capitalization Rate   (0.00%)
Discount rate-loss severity discount   0.00%
Discount rate-loss severity discount   (7.50%)
Assets:    
Discount rate-Comparability adjustments (10.00%) (25.00%)
Discount rate-Comparability adjustments 10.00% 25.00%
Maximum [Member] | Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring 7.10% 7.25%
Discount rate-Recurring (7.10%) (7.25%)
Liabilities:    
Discount rate-Recurring 7.10% 7.25%
Discount rate-Recurring (7.10%) (7.25%)
Maximum [Member] | Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring   4.00%
Discount rate-Recurring   (4.00%)
Liabilities:    
Discount rate-Recurring   4.00%
Discount rate-Recurring   (4.00%)
Maximum [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate 8.00% 8.50%
Discount rate-Capitalization Rate (55.40%) (81.70%)
Discount rate-loss severity discount 55.40% 81.70%
Discount rate-loss severity discount (8.00%) (8.50%)
Maximum [Member] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (89.40%) (89.40%)
Discount rate-loss severity discount 89.40% 89.40%
Assets:    
Discount rate-Comparability adjustments 40.00% 40.00%
Discount rate-Comparability adjustments (40.00%) (40.00%)
Maximum [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate 11.00% 11.00%
Discount rate-Capitalization Rate (51.40%) (74.40%)
Discount rate-loss severity discount 51.40% 74.40%
Discount rate-loss severity discount (11.00%) (11.00%)
Assets:    
Discount rate-Comparability adjustments 25.00% 25.00%
Discount rate-Comparability adjustments (25.00%) (25.00%)
Maximum [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   12.00%
Discount rate-Capitalization Rate   (4.90%)
Discount rate-loss severity discount   4.90%
Discount rate-loss severity discount   (12.00%)
Maximum [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   (36.90%)
Discount rate-loss severity discount   36.90%
Assets:    
Discount rate-Comparability adjustments 25.00% 15.00%
Discount rate-Comparability adjustments (25.00%) (15.00%)
Maximum [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   8.00%
Discount rate-Capitalization Rate   (6.20%)
Discount rate-loss severity discount   6.20%
Discount rate-loss severity discount   (8.00%)
Assets:    
Discount rate-Comparability adjustments 15.00% 0.00%
Discount rate-Comparability adjustments (15.00%) (0.00%)
Weighted Average [Member]    
Assets:    
Discount rate-Capitalization Rate (1.30%)  
Discount rate-loss severity discount 1.30%  
Weighted Average [Member] | Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring (7.10%) (7.20%)
Discount rate-Recurring 7.10% 7.20%
Liabilities:    
Discount rate-Recurring (7.10%) (7.20%)
Discount rate-Recurring 7.10% 7.20%
Weighted Average [Member] | Junior Subordinated Debentures [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring (7.00%) (7.00%)
Discount rate-Recurring 7.00% 7.00%
Liabilities:    
Discount rate-Recurring (7.00%) (7.00%)
Discount rate-Recurring 7.00% 7.00%
Weighted Average [Member] | Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring   (2.30%)
Discount rate-Recurring   2.30%
Liabilities:    
Discount rate-Recurring   (2.30%)
Discount rate-Recurring   2.30%
Weighted Average [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (15.80%) (21.30%)
Discount rate-Capitalization Rate 7.50% 7.80%
Discount rate-loss severity discount (7.50%) (7.80%)
Discount rate-loss severity discount 15.80% 21.30%
Weighted Average [Member] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (12.90%) (20.00%)
Discount rate-loss severity discount 12.90% 20.00%
Assets:    
Discount rate-Comparability adjustments 4.60% 2.20%
Discount rate-Comparability adjustments (4.60%) (2.20%)
Weighted Average [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (15.90%) (30.00%)
Discount rate-Capitalization Rate 7.20% 8.00%
Discount rate-loss severity discount (7.20%) (8.00%)
Discount rate-loss severity discount 15.90% 30.00%
Assets:    
Discount rate-Comparability adjustments 2.30% 6.10%
Discount rate-Comparability adjustments (2.30%) (6.10%)
Weighted Average [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (1.60%) (1.00%)
Discount rate-Capitalization Rate 9.00% 9.10%
Discount rate-loss severity discount (9.00%) (9.10%)
Discount rate-loss severity discount 1.60% 1.00%
Weighted Average [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   (9.60%)
Discount rate-Capitalization Rate 8.60%  
Discount rate-loss severity discount (8.60%)  
Discount rate-loss severity discount   9.60%
Assets:    
Discount rate-Comparability adjustments (10.00%) 3.50%
Discount rate-Comparability adjustments 10.00% (3.50%)
Weighted Average [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate   (3.00%)
Discount rate-Capitalization Rate   7.70%
Discount rate-loss severity discount   (7.70%)
Discount rate-loss severity discount   3.00%
Assets:    
Discount rate-Comparability adjustments (2.50%) 8.90%
Discount rate-Comparability adjustments 2.50% (8.90%)
Weighted Average [Member] | Loans Held for Sale [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Capitalization Rate (19.00%)  
Discount rate-loss severity discount 19.00%