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Portfolio Loans - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan origination (fees) costs	$ 13,400,000		$ 13,400,000		$ 14,000,000
Net accretable purchase accounting adjustments			(4,900,000)		(5,900,000)
Gross interest income that would have been recorded if impaired loans had been current	200,000	$ 300,000	900,000	$ 800,000
Amount of interest collected and recognized on a cash basis				$ 400,000
TDRs subsequently classified as non-performing and had payment defaults | contract		0		0
Collateral dependent loans secured by real estate or business assets			10,000,000		14,000,000
Loans in the process of foreclosure	1,000,000		1,000,000
Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring					3,000,000
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring					500,000
Retail real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased	0	$ 0	0	$ 0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans designated as TDRs | contract		0		1
Maximum | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit where loans are processed through an expedited underwriting process			1,000,000
Watch | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit above which loans are annually reviewed			1,000,000
Special Mention | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Limit above which loans are annually reviewed			350,000
PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of the loans outstanding	$ 600,000		$ 600,000		$ 800,000

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