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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Tax Expense (Benefit) $ 15,318 $ 14,413  
Deferred Tax Assets, Valuation Allowance 0 0 $ 0
Held-to-maturity Securities 0    
Trading Securities 0    
Goodwill, Impairment Loss     0
Servicing Contracts [Member]      
Other Intangible Assets, Net 0 $ 0 $ 0
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit) $ (589)    
Earnings Per Share, Basic and Diluted | $ / shares $ 0.02    
Risk Level, High [Member] | Eagle Commercial Ventures, LLC [Member]      
Number of Higher Risk Lending Transactions Outstanding 3   3
Loans Receivable, Net $ 9,400   $ 9,300
Minimum [Member]      
Loan Period 30 days    
Minimum [Member] | Furniture and Fixtures [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Minimum [Member] | Computer Equipment [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Minimum [Member] | Building Improvements [Member]      
Property, Plant and Equipment, Useful Life 5 years    
Maximum [Member]      
Loan Period 90 days    
Maximum [Member] | Furniture and Fixtures [Member]      
Property, Plant and Equipment, Useful Life 7 years    
Maximum [Member] | Computer Equipment [Member]      
Property, Plant and Equipment, Useful Life 5 years    
Maximum [Member] | Building Improvements [Member]      
Property, Plant and Equipment, Useful Life 20 years    
Banking Services [Member]      
Number of Stores 21    
Lending Services [Member]      
Number of Stores 5