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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | $ 7,150,635 |  | $ 6,814,177 |  |  |
ACL | (92,802) | $ (95,410) | (101,048) | $ (98,841) | $ (96,046) | $ (53,748)
Portfolio loans, net | 7,057,833 |  | 6,713,129 |  |  |
Commercial Loans |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | 1,931,863 |  | 2,014,576 |  |  |
ACL | (24,406) | (24,356) | (23,866) | (24,363) | (24,146) | (18,291)
Commercial Real Estate Loans |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | 3,068,622 |  | 2,892,535 |  |  |
ACL | (39,831) | (39,974) | (46,230) | (45,917) | (42,680) | (21,190)
Real Estate Construction |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | 430,857 |  | 461,786 |  |  |
ACL | (6,121) | (7,599) | (8,193) | (7,419) | (7,792) | (3,204)
Retail Real Estate |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | 1,512,884 |  | 1,407,852 |  |  |
ACL | (19,352) | (20,505) | (21,992) | (20,184) | (20,405) | (10,495)
Retail Other |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |
Portfolio loans | 206,409 |  | 37,428 |  |  |
ACL | $ (3,092) | $ (2,976) | $ (767) | $ (958) | $ (1,023) | $ (568)

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