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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Distributions of portfolio loans |  |  |  |
Portfolio loans | $ 6,779,300 | $ 6,814,177 |  |
ACL | (93,943) | (101,048) | $ (84,384) | $ (53,748)
Portfolio loans, net | 6,685,357 | 6,713,129 |  |
Net deferred loan origination costs | 3,400 | 2,400 |  |
Net accretable purchase accounting adjustments | 9,000 | 10,900 |  |
Commercial Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 2,067,371 | 2,014,576 |  |
ACL | (23,025) | (23,866) | (22,725) | (18,291)
Commercial Real Estate Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 2,912,966 | 2,892,535 |  |
ACL | (43,306) | (46,230) | (35,967) | (21,190)
Real Estate Construction |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 422,633 | 461,786 |  |
ACL | (6,879) | (8,193) | (7,193) | (3,204)
Retail Real Estate |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 1,343,299 | 1,407,852 |  |
ACL | (19,978) | (21,992) | (17,454) | (10,495)
Retail Other |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 33,031 | 37,428 |  |
ACL | (755) | (767) | $ (1,045) | $ (568)
Paycheck Protection Program |  |  |  |
Distributions of portfolio loans |  |  |  |
Amortized cost of the loans outstanding | $ 522,100 | $ 446,400 |  |

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