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Portfolio loans and allowance for loan losses - Summary of risk grades segregated by category (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans
Portfolio loans	$ 6,687,249	$ 5,568,428
Pass
Loans
Portfolio loans	5,997,126	4,976,708
Watch
Loans
Portfolio loans	413,876	330,650
Special Mention
Loans
Portfolio loans	181,107	142,839
Substandard
Loans
Portfolio loans	75,215	86,060
Substandard Non-accrual
Loans
Portfolio loans	27,896	34,997
Commercial | Pass
Loans
Portfolio loans	1,458,416	1,126,257
Commercial | Watch
Loans
Portfolio loans	172,526	172,449
Commercial | Special Mention
Loans
Portfolio loans	66,337	47,000
Commercial | Substandard
Loans
Portfolio loans	41,273	42,532
Commercial | Substandard Non-accrual
Loans
Portfolio loans	9,096	17,953
Commercial real estate | Pass
Loans
Portfolio loans	2,477,398	2,106,711
Commercial real estate | Watch
Loans
Portfolio loans	186,963	137,214
Commercial real estate | Special Mention
Loans
Portfolio loans	105,487	85,148
Commercial real estate | Substandard
Loans
Portfolio loans	26,204	36,205
Commercial real estate | Substandard Non-accrual
Loans
Portfolio loans	9,178	10,298
Real estate construction | Pass
Loans
Portfolio loans	351,923	268,069
Real estate construction | Watch
Loans
Portfolio loans	45,262	14,562
Real estate construction | Special Mention
Loans
Portfolio loans	3,928	3,899
Real estate construction | Substandard
Loans
Portfolio loans	737	1,888
Real estate construction | Substandard Non-accrual
Loans
Portfolio loans	630	18
Retail Real Estate | Pass
Loans
Portfolio loans	1,661,691	1,448,964
Retail Real Estate | Watch
Loans
Portfolio loans	9,125	6,425
Retail Real Estate | Special Mention
Loans
Portfolio loans	5,355	6,792
Retail Real Estate | Substandard
Loans
Portfolio loans	7,001	5,435
Retail Real Estate | Substandard Non-accrual
Loans
Portfolio loans	8,935	6,698
Retail Other | Pass
Loans
Portfolio loans	47,698	26,707
Retail Other | Substandard Non-accrual
Loans
Portfolio loans	57	30
Commercial Loans
Loans
Portfolio loans	1,748,368	1,405,106
Commercial Real Estate Loans
Loans
Portfolio loans	2,793,417	2,366,823
Real Estate Construction
Loans
Portfolio loans	401,861	288,197
Retail Real Estate
Loans
Portfolio loans	1,693,769	1,480,133
Retail Other
Loans
Portfolio loans	$ 49,834	$ 28,169

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=118952595&loc=d3e4428-111522

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