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Portfolio loans and allowance for credit losses - Summary of risk grades segregated by category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans
Portfolio loans	$ 6,814,177	$ 6,687,249
Pass
Loans
Portfolio loans	6,016,748	5,997,126
Watch
Loans
Portfolio loans	554,970	413,876
Special Mention
Loans
Portfolio loans	150,481	181,107
Substandard
Loans
Portfolio loans	69,048	75,215
Substandard Non-accrual
Loans
Portfolio loans	22,930	27,896
Commercial
Loans
Portfolio loans	2,014,576
Commercial | Pass
Loans
Portfolio loans	1,768,755	1,458,416
Commercial | Watch
Loans
Portfolio loans	136,948	172,526
Commercial | Special Mention
Loans
Portfolio loans	72,447	66,337
Commercial | Substandard
Loans
Portfolio loans	27,903	41,273
Commercial | Substandard Non-accrual
Loans
Portfolio loans	8,523	9,096
Commercial real estate
Loans
Portfolio loans	2,892,535
Commercial real estate | Pass
Loans
Portfolio loans	2,393,372	2,477,398
Commercial real estate | Watch
Loans
Portfolio loans	383,277	186,963
Commercial real estate | Special Mention
Loans
Portfolio loans	75,486	105,487
Commercial real estate | Substandard
Loans
Portfolio loans	34,897	26,204
Commercial real estate | Substandard Non-accrual
Loans
Portfolio loans	5,503	9,178
Real estate construction
Loans
Portfolio loans	461,786
Real estate construction | Pass
Loans
Portfolio loans	434,681	351,923
Real estate construction | Watch
Loans
Portfolio loans	24,481	45,262
Real estate construction | Special Mention
Loans
Portfolio loans	77	3,928
Real estate construction | Substandard
Loans
Portfolio loans	2,546	737
Real estate construction | Substandard Non-accrual
Loans
Portfolio loans	1	630
Retail Real Estate
Loans
Portfolio loans	1,407,852
Retail Real Estate | Pass
Loans
Portfolio loans	1,382,616	1,661,691
Retail Real Estate | Watch
Loans
Portfolio loans	10,264	9,125
Retail Real Estate | Special Mention
Loans
Portfolio loans	2,471	5,355
Retail Real Estate | Substandard
Loans
Portfolio loans	3,702	7,001
Retail Real Estate | Substandard Non-accrual
Loans
Portfolio loans	8,799	8,935
Retail Other
Loans
Portfolio loans	37,428
Retail Other | Pass
Loans
Portfolio loans	37,324	47,698
Retail Other | Substandard Non-accrual
Loans
Portfolio loans	104	57
Commercial Loans
Loans
Portfolio loans	2,014,576	1,748,368
Commercial Real Estate Loans
Loans
Portfolio loans	2,892,535	2,793,417
Real Estate Construction
Loans
Portfolio loans	461,786	401,861
Retail Real Estate
Loans
Portfolio loans	1,407,852	1,693,769
Retail Other
Loans
Portfolio loans	$ 37,428	$ 49,834

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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