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Portfolio Loans -Summary of portfolio loans that are past due and still accruing or on a non-accrual status (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | $ 7,856,160 | $ 7,725,702
90 days past due and still accruing | 709 | 673
Non-accrual Loans | 11,298 | 15,067
30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 4,557 | 5,249
60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,377 | 1,299
Past due and non-accrual commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 5,824,800 | 5,766,496
90 days past due and still accruing | 51 | 0
Non-accrual Loans | 7,186 | 11,818
Past due and non-accrual commercial loans | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 0 | 126
Past due and non-accrual commercial loans | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 465 | 0
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,943,449 | 1,974,154
90 days past due and still accruing | 51 | 0
Non-accrual Loans | 5,628 | 6,174
Commercial | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 0 | 2
Commercial | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 112 | 0
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 3,353,753 | 3,261,873
90 days past due and still accruing | 0 | 0
Non-accrual Loans | 1,558 | 5,644
Commercial real estate | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 0 | 124
Commercial real estate | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 109 | 0
Real estate construction |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 527,598 | 530,469
90 days past due and still accruing | 0 |
Non-accrual Loans | 0 |
Real estate construction | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 0 |
Real estate construction | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 244 |
Past due and non-accrual retail loans |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 2,031,360 | 1,959,206
90 days past due and still accruing | 658 | 673
Non-accrual Loans | 4,112 | 3,249
Past due and non-accrual retail loans | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 4,557 | 5,123
Past due and non-accrual retail loans | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 912 | 1,299
Retail real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 1,715,445 | 1,657,082
90 days past due and still accruing | 558 | 673
Non-accrual Loans | 4,042 | 3,096
Retail real estate | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 3,643 | 4,709
Retail real estate | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 840 | 1,239
Retail other |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 315,915 | 302,124
90 days past due and still accruing | 100 | 0
Non-accrual Loans | 70 | 153
Retail other | 30 to 59 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | 914 | 414
Retail other | 60 to 89 days past due and still accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Commercial loans | $ 72 | $ 60

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