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Debt Securities Held-to-Maturity - Mortgage Backed Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 8,648 $ 8,762
Gross Unrealized Gains 370 129
Gross Unrealized Losses 0 5
Estimated Fair Value 9,018 8,886
Mortgage Backed Securities Pass Through Certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 8,648 8,762
Gross Unrealized Gains 370 129
Gross Unrealized Losses 0 5
Estimated Fair Value $ 9,018 $ 8,886