Investment Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Amortized cost: Due in one year or less	$ 3,499
Amortized cost: Due after one year through five years	6,853
Amortized cost: Due after five years through ten years	1,002
Amortized cost: Due after ten years	46,444
Amortized cost: MBS - GSE residential	122,759
Amortized cost: Total available-for-sale debt securities	180,557	$ 184,196
Fair value: Due in one year or less	3,530
Fair value: Due after one year through five years	7,136
Fair value: Due after five years through ten years	1,003
Fair value: Due after ten years	49,208
Fair value: MBS - GSE residential	124,240
Fair value: Total available-for-sale debt securities	$ 185,117	$ 182,810

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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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