Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Abstract]
Available-for-sale, Due in one year or less, Amortized Cost	$ 9,656
Available-for-sale, Due after one year through five years, Amortized Cost	16,746
Available-for-sale, Due after five years through ten years, Amortized Cost	89,827
Available-for-sale, Due after ten years, Amortized Cost	196,475
Available-for-sale, MBS/CMO/ABS, Amortized Cost	404,858
Available-for-Sale Securities, Amortized Cost	717,562	$ 277,323
Available-for-sale, Due in one year or less, Fair Value	9,711
Available-for-sale, Due after one year through five years, Fair Value	17,147
Available-for-sale, Due after five years through ten years, Fair Value	92,652
Available-for-sale, Due after ten years, Fair Value	203,117
Available-for-sale,MBS/CMO/ABS, Fair Value	414,027
Available-for-sale, Fair Value	$ 736,654	$ 283,448

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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