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Available-for-Sale Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) position	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) position
Debt Securities, Available-for-Sale [Line Items]
Number of unrealized loss positions | position	50		46
Number of available-for-sale securities | position	50		47
Unrealized holding losses depreciation percentage from amortized cost	(22.80%)		(20.30%)
Purchases of available-for-sale securities	$ 10,415,000	$ 19,329,000
Proceeds from sale of debt securities, available-for-sale	1,800,000	0
Gain on sales of available-for-sale securities	24,000	0
U. S. Government agency and mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit loss	0
Purchases of available-for-sale securities	10,400,000	11,800,000
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit loss	0
Purchases of available-for-sale securities		2,000,000
Subordinated notes
Debt Securities, Available-for-Sale [Line Items]
Purchases of available-for-sale securities		4,000,000
SBA loan pools
Debt Securities, Available-for-Sale [Line Items]
Purchases of available-for-sale securities		$ 1,500,000
Available-for-Sale Securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit loss	0
Asset Pledged as Collateral | Debt Securities
Debt Securities, Available-for-Sale [Line Items]
Financial instruments, owned, at fair value	$ 65,600,000		$ 30,800,000

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Amount of realized gain (loss) 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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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