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Investment Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment Securities [Abstract]
Amortized cost: Due in one year or less	$ 3,580
Amortized cost: Due after one year through five years	6,868
Amortized cost: Due after five years through ten years	1,625
Amortized cost: Due after ten years	46,685
Amortized cost: MBS - GSE residential	136,555
Amortized cost: Total available-for-sale debt securities	195,313	$ 180,557
Fair value: Due in one year or less	3,594
Fair value: Due after one year through five years	7,336
Fair value: Due after five years through ten years	1,675
Fair value: Due after ten years	50,005
Fair value: MBS - GSE residential	141,374
Fair value: Total available-for-sale debt securities	$ 203,984	$ 185,117

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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