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Investment Securities - Debt Maturities (Details) - Investment securities: - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due within one year $ 1,192,119  
Due after one year through five years 622,016  
Due after five years through ten years 1,157,692  
Due after ten years 871,839  
Amortized cost of available-for-sale investment securities 3,843,666 $ 2,961,430
Fair Value    
Due within one year 1,193,525  
Due after one year through five years 622,930  
Due after five years through ten years 1,165,188  
Due after ten years 872,049  
Available-for-sale, at fair value $ 3,853,692 $ 2,959,843
Weighted- Average Yield    
Due within one year 1.97%  
Due after one year through five years 1.30%  
Due after five years through ten years 0.64%  
Due after ten years 0.68%  
Total, Weighted-Average Yield 1.17%