Investment Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investment Securities [Abstract]
Amortized cost: Due in one year or less	$ 1,990
Amortized cost: Due after one year through five years	13,653
Amortized cost: Due after five years through ten years	115,223
Amortized cost: Due after ten years	349,213
Amortized cost: MBS - GSE residential	258,674
Amortized cost: Total available-for-sale debt securities	738,753	$ 381,088
Fair value: Due in one year or less	2,022
Fair value: Due after one year through five years	13,742
Fair value: Due after five years through ten years	112,659
Fair value: Due after ten years	353,290
Fair value: MBS - GSE residential	257,267
Fair value: Total available-for-sale debt securities	$ 738,980	$ 392,420

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 second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount 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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