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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less $ 63,147  
Due after one year through five years 138,244  
Due after five years through ten years 203,897  
Due after ten years 397,103  
Amortized Cost 802,391 $ 939,160
Fair Value    
Due in one year or less 63,749  
Due after one year through five years 144,457  
Due after five years through ten years 214,141  
Due after ten years 412,145  
Fair Value $ 834,492 $ 952,312