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Portfolio Loans - Schedule of allowance for loan losses and recorded investments in portfolio loans, by category (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | $ 7,849,163 |  | $ 7,710,055 |  |  |
Individually Evaluated for Impairment | 6,997 |  | 15,647 |  |  |
Total | 7,856,160 |  | 7,725,702 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 89,993 |  | 87,107 |  |  |
Individually Evaluated for Impairment | 1,717 |  | 4,501 |  |  |
Total | 91,710 | $ 91,639 | 91,608 | $ 90,722 | $ 88,757 | $ 87,887
Total commercial loans |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 5,817,889 |  | 5,753,438 |  |  |
Individually Evaluated for Impairment | 6,911 |  | 13,058 |  |  |
Total | 5,824,800 |  | 5,766,496 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 60,838 |  | 64,140 |  |  |
Individually Evaluated for Impairment | 1,692 |  | 4,476 |  |  |
Total | 62,530 |  | 68,616 |  |  |
Commercial |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 1,937,943 |  | 1,967,580 |  |  |
Individually Evaluated for Impairment | 5,506 |  | 6,574 |  |  |
Total | 1,943,449 |  | 1,974,154 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 21,057 |  | 21,384 |  |  |
Individually Evaluated for Impairment | 1,576 |  | 2,476 |  |  |
Total | 22,633 | 24,510 | 23,860 | 23,695 | 23,359 | 23,855
Commercial real estate |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 3,352,348 |  | 3,255,636 |  |  |
Individually Evaluated for Impairment | 1,405 |  | 6,237 |  |  |
Total | 3,353,753 |  | 3,261,873 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 34,575 |  | 36,299 |  |  |
Individually Evaluated for Impairment | 116 |  | 2,000 |  |  |
Total | 34,691 | 33,656 | 38,299 | 37,799 | 37,182 | 38,249
Real estate construction |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 527,598 |  | 530,222 |  |  |
Individually Evaluated for Impairment | 0 |  | 247 |  |  |
Total | 527,598 |  | 530,469 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 5,206 |  | 6,457 |  |  |
Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Total | 5,206 | 5,071 | 6,457 | 5,971 | 5,669 | 5,102
Total retail loans |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 2,031,274 |  | 1,956,617 |  |  |
Individually Evaluated for Impairment | 86 |  | 2,589 |  |  |
Total | 2,031,360 |  | 1,959,206 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 29,155 |  | 22,967 |  |  |
Individually Evaluated for Impairment | 25 |  | 25 |  |  |
Total | 29,180 |  | 22,992 |  |  |
Retail real estate |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 1,715,359 |  | 1,654,493 |  |  |
Individually Evaluated for Impairment | 86 |  | 2,589 |  |  |
Total | 1,715,445 |  | 1,657,082 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 25,308 |  | 18,168 |  |  |
Individually Evaluated for Impairment | 25 |  | 25 |  |  |
Total | 25,333 | 24,675 | 18,193 | 18,620 | 17,984 | 17,589
Retail other |  |  |  |  |  |
Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 315,915 |  | 302,124 |  |  |
Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Total | 315,915 |  | 302,124 |  |  |
ACL Attributed to Portfolio Loans |  |  |  |  |  |
Collectively Evaluated for Impairment | 3,847 |  | 4,799 |  |  |
Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Total | $ 3,847 | $ 3,727 | $ 4,799 | $ 4,637 | $ 4,563 | $ 3,092

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