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Portfolio Loans - Summary of risk grades segregated by category of portfolio loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | $ 7,856,160 | $ 7,725,702
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 7,005,508 | 6,964,678
Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 721,586 | 563,897
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 70,118 | 91,405
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 47,650 | 90,655
Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 11,298 | 15,067
Total commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 5,824,800 | 5,766,496
Total commercial loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 4,990,971 | 5,023,108
Total commercial loans | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 711,341 | 553,377
Total commercial loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 69,476 | 90,067
Total commercial loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 45,826 | 88,126
Total commercial loans | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 7,186 | 11,818
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,943,449 | 1,974,154
Commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,533,562 | 1,668,495
Commercial | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 350,820 | 201,758
Commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 24,705 | 46,540
Commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 28,734 | 51,187
Commercial | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 5,628 | 6,174
Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 3,353,753 | 3,261,873
Commercial real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 2,944,191 | 2,851,709
Commercial real estate | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 351,494 | 326,455
Commercial real estate | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 44,771 | 43,526
Commercial real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 11,739 | 34,539
Commercial real estate | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,558 | 5,644
Real estate construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 527,598 | 530,469
Real estate construction | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 513,218 | 502,904
Real estate construction | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 9,027 | 25,164
Real estate construction | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 0 | 1
Real estate construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 5,353 | 2,400
Real estate construction | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 0 | 0
Total retail loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 2,031,360 | 1,959,206
Total retail loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 2,014,537 | 1,941,570
Total retail loans | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 10,245 | 10,520
Total retail loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 642 | 1,338
Total retail loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,824 | 2,529
Total retail loans | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 4,112 | 3,249
Retail real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,715,445 | 1,657,082
Retail real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,698,692 | 1,639,599
Retail real estate | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 10,245 | 10,520
Retail real estate | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 642 | 1,338
Retail real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 1,824 | 2,529
Retail real estate | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 4,042 | 3,096
Retail other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 315,915 | 302,124
Retail other | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 315,845 | 301,971
Retail other | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 0 | 0
Retail other | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 0 | 0
Retail other | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | 0 | 0
Retail other | Substandard Non-accrual |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Commercial loans | $ 70 | $ 153

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