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Note 17 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans   1      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   647,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   0      
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 846 $ 607 $ 866  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 5,200      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   5 years      
Proceeds (Used for) and Received from Settlement of Stock Awards   $ (154) (216)    
Share-based Compensation Arrangement by Share-based Payment Award, Options and SARs, Exercisable Intrinsic Value   $ 1,700 1,900 $ 4,200  
Common Stock, Capital Shares Reserved for Future Issuance   117,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expected Shares to be Awarded   181,000      
Accounting Standards Update 2016-09 [Member]          
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 549 $ 1,500    
Employee Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%      
Employee Stock Option [Member] | Share-based Compensation Award, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%      
Employee Stock Option [Member] | Share-based Compensation Award, Tranche Five [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%      
Employee Stock Option [Member] | Share-based Compensation Award, Tranche Three [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%      
Employee Stock Option [Member] | Share-based Compensation Award, Tranche Four [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%      
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [1]   647,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 6.07 $ 6.34 $ 3.56  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   731,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   $ 22.42      
Common Stock, Capital Shares Reserved for Future Issuance [2]        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [1]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 35.89 $ 44.85 $ 25.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   40,000 29,000 51,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance   $ 32.09 $ 27.62 $ 21.57 $ 18.98
Common Stock, Capital Shares Reserved for Future Issuance   110,000      
Restricted Stock [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 6,525        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 247        
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [1]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years      
Sharebased Compensation Arrangement by Share-based Payment Award Post Vesting Holding Period   1 year      
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount   4.30% 5.10% 4.50%  
Common Stock, Capital Shares Reserved for Future Issuance [3]        
Performance Shares [Member] | Minimum [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   0      
Performance Shares [Member] | Maximum [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   203,000      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [1]        
Common Stock, Capital Shares Reserved for Future Issuance   7,000      
Restricted Stock Units (RSUs) [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year      
[1] Under the 2015 Omnibus Equity Compensation Plan, shares of stock are authorized for issuance as incentive and nonqualified stock options, SARs, restricted stock, and restricted stock units
[2] At December 31, 2018, approximately 731 thousand SARs were outstanding at a weighted average grant price of $22.42. The number of shares to be issued upon exercise will be determined based on the difference between the grant price and the market price at the date of exercise.
[3] The number of shares to be issued is dependent upon Bancorp achieving certain predefined performance targets and ranges from zero shares to approximately 203 thousand shares. As of December 31, 2018, the expected shares to be awarded are approximately 181 thousand.