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Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Debt Securities, Available-for-sale, Realized Gain $ 5 $ 244    
Gross unrealized losses 6,705   $ 440  
Cumulative OTTI charges 2,974 $ 2,974 2,974 $ 2,974
Amortized Cost 1,068,032   977,830  
Securities available-for-sale $ 1,097,093   $ 1,020,744  
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%