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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]                
Debt Securities, Available-for-sale, Realized Gain $ 6              
Gain on sale of investments (6) $ (3) $ (18) $ (5)        
Gross unrealized losses 1,331   1,331     $ 15,214    
Cumulative OTTI charges 2,974 $ 2,974 2,974 $ 2,974 $ 2,974 2,974 $ 2,974 $ 7,132
Amortized Cost 918,591   918,591     793,084    
Securities available-for-sale $ 939,944   $ 939,944     $ 784,916    
Minimum [Member]                
Debt Securities, Available-for-sale [Line Items]                
Basis point spread on variable rate 1.60%   1.60%          
Maximum [Member]                
Debt Securities, Available-for-sale [Line Items]                
Basis point spread on variable rate 1.80%   1.80%