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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Goodwill, Impairment Loss $ 0    
Finite-lived Intangible Assets, Fair Value Disclosure 3,200 $ 3,600  
Loans Serviced for Others Outstanding Principal Balance 324,900 327,900  
Core Deposits [Member]      
Finite-Lived Intangible Assets, Net, Ending Balance 1,000 $ 1,100  
Indiana Bank [Member] | Commercial Banking [Member]      
Goodwill, Ending Balance $ 682    
THE BANCorp [Member] | Core Deposits [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 2,500