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Portfolio Loans - Summary of risk grades segregated by category of portfolio loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	$ 7,783,808	$ 7,725,702
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	6,995,343	6,964,678
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	599,341	563,897
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	86,525	91,405
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	87,885	90,655
Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	14,714	15,067
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,815,703	5,766,496
Total commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,045,412	5,023,108
Total commercial loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	587,619	553,377
Total commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	86,022	90,067
Total commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	85,679	88,126
Total commercial loans | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	10,971	11,818
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,937,158	1,974,154
Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,624,656	1,668,495
Commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	208,613	201,758
Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	42,827	46,540
Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	55,652	51,187
Commercial | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,410	6,174
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,324,536	3,261,873
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,888,970	2,851,709
Commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	362,187	326,455
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	43,195	43,526
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	24,623	34,539
Commercial real estate | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,561	5,644
Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	554,009	530,469
Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	531,786	502,904
Real estate construction | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	16,819	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	5,404	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	1,968,105	1,959,206
Total retail loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,949,931	1,941,570
Total retail loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	11,722	10,520
Total retail loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	503	1,338
Total retail loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,206	2,529
Total retail loans | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,743	3,249
Retail real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,667,537	1,657,082
Retail real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,649,407	1,639,599
Retail real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	11,722	10,520
Retail real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	503	1,338
Retail real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,206	2,529
Retail real estate | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,699	3,096
Retail other
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	300,568	302,124
Retail other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	300,524	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	$ 44	$ 153

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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