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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized Cost    
Due within 1 year $ 1,327  
Due after 1 but within 5 years 7,541  
Due after 5 but within 10 years 31,824  
Due after 10 years 0  
Amortized Cost 40,692  
Debt Securities, Held-to-maturity 337,123 $ 393,855
Estimated Fair Value    
Due within 1 year 1,331  
Due after 1 but within 5 years 7,621  
Due after 5 but within 10 years 32,294  
Due after 10 years 0  
Estimated Fair Value 41,246  
Securities held to maturity, fair value 338,718 $ 383,993
Mortgage-Backed Securities [Member]    
Amortized Cost    
Debt Securities, Held-to-maturity [1] 296,431  
Estimated Fair Value    
Securities held to maturity, fair value [1] 297,472  
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member]    
Amortized Cost    
Debt Securities, Held-to-maturity 54,700  
Estimated Fair Value    
Securities held to maturity, fair value 54,600  
Mortgage-Backed Securities [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Amortized Cost    
Debt Securities, Held-to-maturity 241,700  
Estimated Fair Value    
Securities held to maturity, fair value $ 242,900  
[1]
Mortgage Backed Securities include an amortized cost of $54.7 million and a fair value of $54.6 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $241.7 million and a fair value of $242.9 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.