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Marketable Securities - Held To Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized cost    
Marketable securities held-to-maturity, amortized cost $ 17,208 $ 18,036
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 768 187
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses (8) 0
Fair value    
Marketable securities held-to-maturity, fair value 17,968 18,223
Residential mortgage-backed securities    
Amortized cost    
Marketable securities held-to-maturity, amortized cost 17,208 18,036
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 768 187
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses (8) 0
Fair value    
Marketable securities held-to-maturity, fair value 17,968 18,223
Fixed rate | Pass-through    
Amortized cost    
Marketable securities held-to-maturity, amortized cost 2,096 2,197
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 113 83
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses 0 0
Fair value    
Marketable securities held-to-maturity, fair value 2,209 2,280
Fixed rate | Agency CMOs    
Amortized cost    
Marketable securities held-to-maturity, amortized cost 13,389 14,016
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 639 68
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses 0 0
Fair value    
Marketable securities held-to-maturity, fair value 14,028 14,084
Variable rate | Pass-through    
Amortized cost    
Marketable securities held-to-maturity, amortized cost 1,119 1,210
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 15 28
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses 0 0
Fair value    
Marketable securities held-to-maturity, fair value 1,134 1,238
Variable rate | Agency CMOs    
Amortized cost    
Marketable securities held-to-maturity, amortized cost 604 613
Gross unrealized holding gains    
Marketable securities held-to-maturity, gross unrealized holding gains 1 8
Gross unrealized holding losses    
Marketable securities held-to-maturity, gross unrealized holding losses (8) 0
Fair value    
Marketable securities held-to-maturity, fair value $ 597 $ 621