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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 ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Fair value-Recurring (in Dollars) $ 1,037,591,000 $ 973,394,000
Liabilities:    
Fair value-Recurring (in Dollars) 4,897,828,000 4,620,766,000
Assets:    
Fair value-Comparability adjustments (in Dollars) 21,467 28,500
Fair value-Comparability adjustments (in Dollars) 21,467 28,500
Fair value-Loss Severity (in Dollars) 21,467 28,500
Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Fair value-Recurring (in Dollars) $ 7,899,000 15,519,000
Discount rate-Recurring 4.00%  
Discount rate-Recurring (4.00%)  
Liabilities:    
Discount rate-Recurring 4.00%  
Discount rate-Recurring (4.00%)  
Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Fair value-Recurring (in Dollars) $ 7,226,000 $ 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) $ 29,476,000 $ 28,771,000
Discount rate-Recurring 7.00% 7.00%
Discount rate-Recurring (7.00%) (7.00%)
Loans Held for Sale [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 300,000  
Discount rate-Comparability adjustments 59.60%  
Discount rate-Comparability adjustments (59.60%)  
Fair value-Comparability adjustments (in Dollars) $ 300,000  
Fair value-Loss Severity (in Dollars) 300,000  
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) 5,587,000 $ 6,935,000
Fair value-Comparability adjustments (in Dollars) 5,587,000 6,935,000
Fair value-Loss Severity (in Dollars) 5,587,000 6,935,000
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) 3,910,000 6,981,000
Fair value-Comparability adjustments (in Dollars) 3,910,000 6,981,000
Fair value-Loss Severity (in Dollars) 3,910,000 6,981,000
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) 7,415,000 8,258,000
Fair value-Comparability adjustments (in Dollars) 7,415,000 8,258,000
Fair value-Loss Severity (in Dollars) 7,415,000 8,258,000
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) 4,097,000 587,000
Fair value-Comparability adjustments (in Dollars) 4,097,000 587,000
Fair value-Loss Severity (in Dollars) 4,097,000 587,000
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars) $ 158,000 4,768,000
Discount rate - Capitalization Rate 16.10%  
Discount rate- Capitalization Rate (12.00%)  
Fair value-Comparability adjustments (in Dollars) $ 158,000 4,768,000
Fair value-Loss Severity (in Dollars) $ 158,000 4,768,000
Capitalization rate-Loss Severity 12.00%  
Capitalization rate-Loss Severity (16.10%)  
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Fair value-Comparability adjustments (in Dollars)   971,000
Fair value-Comparability adjustments (in Dollars)   971,000
Fair value-Loss Severity (in Dollars)   $ 971,000
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] | 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] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments (50.00%) (41.50%)
Discount rate-Comparability adjustments 50.00% 41.50%
Discount rate - Capitalization Rate 0.20% 1.80%
Capitalization rate-Loss Severity (0.20%) (1.80%)
Minimum [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate 0.50% 0.50%
Discount rate- Capitalization Rate (7.30%) (7.30%)
Capitalization rate-Loss Severity 7.30% 7.30%
Capitalization rate-Loss Severity (0.50%) (0.50%)
Minimum [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments (50.00%) (55.00%)
Discount rate-Comparability adjustments 50.00% 55.00%
Discount rate - Capitalization Rate 0.90% 0.90%
Discount rate- Capitalization Rate (5.60%) (5.80%)
Capitalization rate-Loss Severity 5.60% 5.80%
Capitalization rate-Loss Severity (0.90%) (0.90%)
Minimum [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments (41.50%) (11.90%)
Discount rate-Comparability adjustments 41.50% 11.90%
Discount rate - Capitalization Rate 1.60% 0.00%
Capitalization rate-Loss Severity (1.60%) (0.00%)
Minimum [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate   0.90%
Discount rate- Capitalization Rate   (9.00%)
Capitalization rate-Loss Severity   9.00%
Capitalization rate-Loss Severity   (0.90%)
Minimum [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments   (25.00%)
Discount rate-Comparability adjustments   25.00%
Discount rate - Capitalization Rate   0.00%
Discount rate- Capitalization Rate   (7.50%)
Capitalization rate-Loss Severity   7.50%
Capitalization rate-Loss Severity   (0.00%)
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] | 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] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments 40.00% 40.00%
Discount rate-Comparability adjustments (40.00%) (40.00%)
Discount rate - Capitalization Rate 89.40% 89.40%
Capitalization rate-Loss Severity (89.40%) (89.40%)
Maximum [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate 55.40% 81.70%
Discount rate- Capitalization Rate (8.00%) (8.50%)
Capitalization rate-Loss Severity 8.00% 8.50%
Capitalization rate-Loss Severity (55.40%) (81.70%)
Maximum [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments 25.00% 25.00%
Discount rate-Comparability adjustments (25.00%) (25.00%)
Discount rate - Capitalization Rate 50.70% 74.40%
Discount rate- Capitalization Rate (11.00%) (11.00%)
Capitalization rate-Loss Severity 11.00% 11.00%
Capitalization rate-Loss Severity (50.70%) (74.40%)
Maximum [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments 25.00% 15.00%
Discount rate-Comparability adjustments (25.00%) (15.00%)
Discount rate - Capitalization Rate 66.20% 36.90%
Capitalization rate-Loss Severity (66.20%) (36.90%)
Maximum [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate   4.90%
Discount rate- Capitalization Rate   (12.00%)
Capitalization rate-Loss Severity   12.00%
Capitalization rate-Loss Severity   (4.90%)
Maximum [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments   0.00%
Discount rate-Comparability adjustments   (0.00%)
Discount rate - Capitalization Rate   6.20%
Discount rate- Capitalization Rate   (8.00%)
Capitalization rate-Loss Severity   8.00%
Capitalization rate-Loss Severity   (6.20%)
Weighted Average [Member] | Municipals Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Discount rate-Recurring 4.00% 2.30%
Discount rate-Recurring (4.00%) (2.30%)
Liabilities:    
Discount rate-Recurring 4.00% 2.30%
Discount rate-Recurring (4.00%) (2.30%)
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] | Loans Held for Sale [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments 59.60%  
Discount rate-Comparability adjustments (59.60%)  
Weighted Average [Member] | Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate- Capitalization Rate (13.20%) (20.00%)
Capitalization rate-Loss Severity 13.20% 20.00%
Weighted Average [Member] | Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate 7.70% 7.80%
Discount rate- Capitalization Rate (15.70%) (21.30%)
Capitalization rate-Loss Severity 15.70% 21.30%
Capitalization rate-Loss Severity (7.70%) (7.80%)
Weighted Average [Member] | Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate 7.50% 8.00%
Discount rate- Capitalization Rate (16.30%) (30.00%)
Capitalization rate-Loss Severity 16.30% 30.00%
Capitalization rate-Loss Severity (7.50%) (8.00%)
Weighted Average [Member] | Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate-Comparability adjustments 0.00%  
Discount rate-Comparability adjustments (0.00%)  
Discount rate- Capitalization Rate (18.50%) (9.60%)
Capitalization rate-Loss Severity 18.50% 9.60%
Weighted Average [Member] | Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate 12.00% 9.10%
Discount rate- Capitalization Rate (16.10%) (1.00%)
Capitalization rate-Loss Severity 16.10% 1.00%
Capitalization rate-Loss Severity (12.00%) (9.10%)
Weighted Average [Member] | Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Discount rate - Capitalization Rate   7.70%
Discount rate- Capitalization Rate   (3.00%)
Capitalization rate-Loss Severity   3.00%
Capitalization rate-Loss Severity   (7.70%)