Investment Securities - Summary of Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available for sale, Amortized Cost
Amortized Cost	$ 446,676	$ 400,718
Available for sale, Fair Value
Fair Value	450,772	410,624
Total debt securities
Available for sale, Amortized Cost
Within one year	0
After one year, but within five years	87,689
After five years, but within ten years	59,339
After ten years	288,861
Amortized Cost	435,889	382,317
Available for sale, Fair Value
Within one year	0
After one year, but within five years	87,564
After five years, but within ten years	59,499
After ten years	292,780
Fair Value	$ 439,843	$ 392,148

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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