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Securities - Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due within one year $ 0  
Due after one year but within five years 28,670  
Due after five years but within ten years 74,016  
Due after ten years 11,000  
Mortgage-backed securities 1,318,998  
Amortized Cost 1,432,684 $ 812,202
Securities available for sale:    
Due within one year 0  
Due after one year but within five years 30,265  
Due after five years but within ten years 74,400  
Due after ten years 10,761  
Mortgage-backed securities 1,337,706  
Total securities 1,453,132 821,945
Amortized Cost    
Due within one year 2,087  
Due after one year but within five years 2,915  
Due after five years but within ten years 3,418  
Due after ten years 129,172  
Mortgage-backed securities 29,959  
Amortized Cost 167,551 67,932
Fair Value    
Due within one year 2,101  
Due after one year but within five years 3,008  
Due after five years but within ten years 3,536  
Due after ten years 131,189  
Mortgage-backed securities 30,900  
Total securities $ 170,734 $ 68,333