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Portfolio Loans - Schedule of financial instruments owned and pledged as collateral (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Portfolio loans, net | $ 7,713,645 | $ 7,634,094
Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Portfolio loans, net | 5,611,623 | 5,900,166
FHLB |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Portfolio loans, net | 4,817,800 | 5,095,448
Federal Reserve Bank |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Portfolio loans, net | $ 793,823 | $ 804,718

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