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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]        
Debt Securities, Available-for-sale, Realized Gain $ 34 $ 16    
Gross unrealized losses 234   $ 1,834  
Cumulative OTTI charges 2,974 $ 2,974 2,974 $ 2,974
Amortized Cost 867,416   907,575  
Securities available-for-sale $ 907,433   $ 926,717  
Minimum [Member]        
Debt Securities, Available-for-sale [Line Items]        
Basis point spread on variable rate 1.60%      
Maximum [Member]        
Debt Securities, Available-for-sale [Line Items]        
Basis point spread on variable rate 1.80%