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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | $ 7,670,114 |  | $ 7,188,998 |  |  |
ACL | (90,722) | $ (88,757) | (87,887) | $ (92,802) | $ (95,410) | $ (101,048)
Portfolio loans, net | 7,579,392 |  | 7,101,111 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | 1,945,893 |  | 1,943,886 |  |  |
ACL | (23,695) | (23,359) | (23,855) | (24,406) | (24,356) | (23,866)
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | 3,278,684 |  | 3,119,807 |  |  |
ACL | (37,799) | (37,182) | (38,249) | (39,831) | (39,974) | (46,230)
Real estate construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | 499,560 |  | 385,996 |  |  |
ACL | (5,971) | (5,669) | (5,102) | (6,121) | (7,599) | (8,193)
Retail real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | 1,643,099 |  | 1,512,976 |  |  |
ACL | (18,620) | (17,984) | (17,589) | (19,352) | (20,505) | (21,992)
Retail other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Portfolio loans | 302,878 |  | 226,333 |  |  |
ACL | $ (4,637) | $ (4,563) | $ (3,092) | $ (3,092) | $ (2,976) | $ (767)

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