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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]                
Gain on sale of investments $ (3) $ (27) $ (5) $ (44)        
Gross unrealized losses 23,412   23,412     $ 9,535    
Cumulative OTTI charges 2,974 $ 7,132 2,974 $ 7,132 $ 2,974 7,132 $ 7,132 $ 13,974
Amortized Cost 803,271   803,271     811,369    
Securities available-for-sale $ 785,693   $ 785,693     $ 814,931    
Minimum [Member]                
Debt Securities, Available-for-sale [Line Items]                
Basis point spread on variable rate 1.60%   1.60%          
Minimum [Member] | Standard Poors [Member]                
Debt Securities, Available-for-sale [Line Items]                
Credit Quality Indicator Pricing 85.57   85.57          
Minimum [Member] | Moody Investor Service [Member]                
Debt Securities, Available-for-sale [Line Items]                
Credit Quality Indicator Pricing 21.23   21.23          
Maximum [Member]                
Debt Securities, Available-for-sale [Line Items]                
Basis point spread on variable rate 1.80%   1.80%