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Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 48,897
Due after one year through five years	134,310
Due after five years through ten years	285,906
Due after ten years	407,244
Amortized Cost	876,357	$ 770,195
Fair Value
Due in one year or less	49,279
Due after one year through five years	140,053
Due after five years through ten years	290,676
Due after ten years	413,550
Fair Value	$ 893,558	$ 802,163

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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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