Investment Securities - Summary of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 379,501	$ 245,871
Gross Unrealized Gains	980	1,956
Gross Unrealized Losses	(1,359)	(194)
Allowance for Credit Losses	0
Fair Value	379,122	247,633
Schedule of Held-to-maturity Securities [Line Items]
Allowance for credit losses	0
Total securities held to maturity, net of ACL	20,000	10,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(736)	0
Fair Value	19,264	10,000
U.S. Treasury and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	300,674	173,318
Gross Unrealized Gains	465	1,330
Gross Unrealized Losses	(1,315)	(47)
Allowance for Credit Losses	0
Fair Value	299,824	174,601
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	820	820
Gross Unrealized Gains	30	36
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	850	856
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,969	29,951
Gross Unrealized Gains	462	546
Gross Unrealized Losses	(20)	(5)
Allowance for Credit Losses	0
Fair Value	35,411	30,492
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	20,000	10,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(736)	0
Fair Value	19,264	10,000
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,038	41,782
Gross Unrealized Gains	23	44
Gross Unrealized Losses	(24)	(142)
Allowance for Credit Losses	0
Fair Value	$ 43,037	$ 41,684

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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