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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans
2021	$ 1,522,350
2020	1,616,729	$ 2,216,953
2019	1,049,168	1,168,069
2018	688,565	798,327
2017	537,654	699,747
2016		441,456
Prior	868,553	650,638
Revolving loans	902,631	838,987
Ending balance	7,185,650	6,814,177
Pass
Loans
Ending balance	6,426,332	6,016,748
Watch
Loans
Ending balance	540,258	554,970
Special Mention
Loans
Ending balance	146,235	150,481
Substandard
Loans
Ending balance	45,100	69,048
Substandard Non-accrual
Loans
Ending balance	27,725	22,930
Commercial
Loans
2021	572,672
2020	378,163	843,404
2019	146,310	190,061
2018	106,744	127,410
2017	97,835	118,185
2016		72,647
Prior	157,289	105,947
Revolving loans	595,537	556,922
Ending balance	2,054,550	2,014,576
Commercial | Pass
Loans
2021	550,732
2020	363,044	812,536
2019	118,095	158,307
2018	94,495	107,565
2017	79,018	93,190
2016		61,847
Prior	129,150	79,970
Revolving loans	481,922	455,340
Ending balance	1,816,456	1,768,755
Commercial | Watch
Loans
2021	11,051
2020	7,412	16,544
2019	20,256	22,247
2018	5,597	14,954
2017	8,415	13,724
2016		2,577
Prior	9,830	10,943
Revolving loans	68,800	55,959
Ending balance	131,361	136,948
Commercial | Special Mention
Loans
2021	2,739
2020	2,650	6,402
2019	2,864	2,671
2018	4,845	2,069
2017	6,920	7,164
2016		6,763
Prior	18,111	13,733
Revolving loans	38,577	33,645
Ending balance	76,706	72,447
Commercial | Substandard
Loans
2021	3,794
2020	4,588	7,772
2019	3,504	3,791
2018	1,807	2,371
2017	1,338	1,939
2016		819
Prior	80	1,233
Revolving loans	4,238	9,978
Ending balance	19,349	27,903
Commercial | Substandard Non-accrual
Loans
2021	4,356
2020	469	150
2019	1,591	3,045
2018		451
2017	2,144	2,168
2016		641
Prior	118	68
Revolving loans	2,000	2,000
Ending balance	10,678	8,523
Commercial real estate
Loans
2021	485,110
2020	763,300	840,882
2019	582,526	628,303
2018	410,571	463,787
2017	311,926	437,776
2016		222,941
Prior	346,777	278,923
Revolving loans	20,102	19,923
Ending balance	2,920,312	2,892,535
Commercial real estate | Pass
Loans
2021	420,841
2020	691,476	717,559
2019	441,952	503,977
2018	313,315	360,573
2017	269,126	384,843
2016		180,555
Prior	291,896	227,068
Revolving loans	17,537	18,797
Ending balance	2,446,143	2,393,372
Commercial real estate | Watch
Loans
2021	39,642
2020	53,762	88,297
2019	130,096	110,526
2018	84,131	90,412
2017	28,486	33,734
2016		32,887
Prior	41,473	27,023
Revolving loans	1,956	398
Ending balance	379,546	383,277
Commercial real estate | Special Mention
Loans
2021	22,415
2020	7,389	16,490
2019	6,780	8,858
2018	9,907	10,490
2017	10,285	10,505
2016		7,102
Prior	9,794	21,808
Revolving loans	609	233
Ending balance	67,179	75,486
Commercial real estate | Substandard
Loans
2021	2,134
2020	9,898	17,445
2019	2,465	4,166
2018	2,397	1,491
2017	25	7,812
2016		2,111
Prior	1,760	1,377
Revolving loans		495
Ending balance	18,679	34,897
Commercial real estate | Substandard Non-accrual
Loans
2021	78
2020	775	1,091
2019	1,233	776
2018	821	821
2017	4,004	882
2016		286
Prior	1,854	1,647
Ending balance	8,765	5,503
Real estate construction
Loans
2021	102,215
2020	196,512	200,184
2019	149,425	175,330
2018	35,033	64,362
2017	2,616	3,306
2016		1,071
Prior	1,418	1,445
Revolving loans	13,380	16,088
Ending balance	500,599	461,786
Real estate construction | Pass
Loans
2021	99,885
2020	183,938	179,232
2019	148,531	171,663
2018	34,750	64,025
2017	957	1,468
2016		761
Prior	1,277	1,444
Revolving loans	13,380	16,088
Ending balance	482,718	434,681
Real estate construction | Watch
Loans
2021	2,330
2020	10,174	18,485
2019	886	3,657
2018	283	337
2017	1,659	1,838
2016		164
Prior	141
Ending balance	15,473	24,481
Real estate construction | Special Mention
Loans
2020		67
2019	8	10
Ending balance	8	77
Real estate construction | Substandard
Loans
2020	2,400	2,400
2016		146
Ending balance	2,400	2,546
Real estate construction | Substandard Non-accrual
Loans
Prior		1
Ending balance		1
Retail Real Estate
Loans
2021	339,821
2020	250,264	324,112
2019	135,766	164,938
2018	112,318	137,163
2017	112,040	137,949
2016		144,101
Prior	358,532	263,826
Revolving loans	217,069	235,763
Ending balance	1,525,810	1,407,852
Retail Real Estate | Pass
Loans
2021	335,450
2020	246,690	319,302
2019	133,617	162,711
2018	110,169	135,065
2017	110,300	136,427
2016		140,600
Prior	349,052	257,147
Revolving loans	211,399	231,364
Ending balance	1,496,677	1,382,616
Retail Real Estate | Watch
Loans
2021	2,925
2020	2,415	2,715
2019	2,002	2,053
2018	1,515	1,396
2017	305	349
2016		579
Prior	388	233
Revolving loans	4,328	2,939
Ending balance	13,878	10,264
Retail Real Estate | Special Mention
Loans
2021	377
2020	31	509
2016		1,962
Prior	1,934
Ending balance	2,342	2,471
Retail Real Estate | Substandard
Loans
2021	730
2020	967	899
2019	73	96
2018	98	56
2017	235	26
2016		727
Prior	2,485	1,631
Revolving loans	84	267
Ending balance	4,672	3,702
Retail Real Estate | Substandard Non-accrual
Loans
2021	339
2020	161	687
2019	74	78
2018	536	646
2017	1,200	1,147
2016		233
Prior	4,673	4,815
Revolving loans	1,258	1,193
Ending balance	8,241	8,799
Retail Other
Loans
2021	22,532
2020	28,490	8,371
2019	35,141	9,437
2018	23,899	5,605
2017	13,237	2,531
2016		696
Prior	4,537	497
Revolving loans	56,543	10,291
Ending balance	184,379	37,428
Retail Other | Pass
Loans
2021	22,532
2020	28,477	8,357
2019	35,134	9,430
2018	23,894	5,600
2017	13,223	2,516
2016		691
Prior	4,535	440
Revolving loans	56,543	10,290
Ending balance	184,338	37,324
Retail Other | Substandard Non-accrual
Loans
2020	13	14
2019	7	7
2018	5	5
2017	14	15
2016		5
Prior	2	57
Revolving loans		1
Ending balance	41	104
Commercial Loans
Loans
Ending balance	2,054,550	2,014,576
Commercial Real Estate Loans
Loans
Ending balance	2,920,312	2,892,535
Real Estate Construction
Loans
Ending balance	500,599	461,786
Retail Real Estate
Loans
Ending balance	1,525,810	1,407,852
Retail Other
Loans
Ending balance	$ 184,379	$ 37,428

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