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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | $ 7,783,808 | $ 7,725,702 |  |
ACL | (91,727) | (91,608) | $ (88,213) | $ (87,887)
Portfolio loans, net | 7,692,081 | 7,634,094 |  |
Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 5,815,703 | 5,766,496 |  |
ACL | (63,856) | (68,616) |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 1,937,158 | 1,974,154 |  |
ACL | (24,276) | (23,860) | (24,173) | (23,855)
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 3,324,536 | 3,261,873 |  |
ACL | (34,421) | (38,299) | (37,339) | (38,249)
Real estate construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 554,009 | 530,469 |  |
ACL | (5,159) | (6,457) | (5,705) | (5,102)
Total retail loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 1,968,105 | 1,959,206 |  |
ACL | (27,871) | (22,992) |  |
Retail real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 1,667,537 | 1,657,082 |  |
ACL | (24,255) | (18,193) | (17,555) | (17,589)
Retail other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loans | 300,568 | 302,124 |  |
ACL | $ (3,616) | $ (4,799) | $ (3,441) | $ (3,092)

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