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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]        
Debt Securities, Available-for-sale, Realized Gain $ 2      
Gain on sale of investments 4 $ 0    
Gross unrealized losses 6,476   $ 15,214  
Cumulative OTTI charges 2,974 $ 7,132 2,974 $ 7,132
Amortized Cost 781,073   793,084  
Securities available-for-sale $ 786,211   $ 784,916  
Minimum [Member]        
Debt Securities, Available-for-sale [Line Items]        
Basis point spread on variable rate 1.60%      
Minimum [Member] | Standard Poors [Member]        
Debt Securities, Available-for-sale [Line Items]        
Credit Quality Indicator Pricing 82.35      
Minimum [Member] | Moody Investor Service [Member]        
Debt Securities, Available-for-sale [Line Items]        
Credit Quality Indicator Pricing 20.75      
Maximum [Member]        
Debt Securities, Available-for-sale [Line Items]        
Basis point spread on variable rate 1.80%