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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | $ 7,805,284 |  | $ 7,725,702 |  |  |
ACL | (91,639) | $ (91,727) | (91,608) | $ (88,757) | $ (88,213) | $ (87,887)
Portfolio loans, net | 7,713,645 |  | 7,634,094 |  |  |
Total commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 5,793,426 |  | 5,766,496 |  |  |
ACL | (63,237) |  | (68,616) |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 1,899,718 |  | 1,974,154 |  |  |
ACL | (24,510) | (24,276) | (23,860) | (23,359) | (24,173) | (23,855)
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 3,361,308 |  | 3,261,873 |  |  |
ACL | (33,656) | (34,421) | (38,299) | (37,182) | (37,339) | (38,249)
Real estate construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 532,400 |  | 530,469 |  |  |
ACL | (5,071) | (5,159) | (6,457) | (5,669) | (5,705) | (5,102)
Total retail loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 2,011,858 |  | 1,959,206 |  |  |
ACL | (28,402) |  | (22,992) |  |  |
Retail real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 1,703,057 |  | 1,657,082 |  |  |
ACL | (24,675) | (24,255) | (18,193) | (17,984) | (17,555) | (17,589)
Retail other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans | 308,801 |  | 302,124 |  |  |
ACL | $ (3,727) | $ (3,616) | $ (4,799) | $ (4,563) | $ (3,441) | $ (3,092)

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