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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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- Definition

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