Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Securities available-for-sale:
Amortized Cost	$ 505,713	$ 99,359
Gross Unrealized Gains		2,893
Gross Unrealized (Losses)	(16,117)
Estimated Fair Value	489,596	102,252
U.S. Treasury
Securities available-for-sale:
Amortized Cost	428,797
Gross Unrealized (Losses)	(10,323)
Estimated Fair Value	418,474
Agency mortgage-backed securities
Securities available-for-sale:
Amortized Cost	76,916	99,359
Gross Unrealized Gains		2,893
Gross Unrealized (Losses)	(5,794)
Estimated Fair Value	$ 71,122	$ 102,252

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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).

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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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