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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans
2021	$ 1,872,128
2020	1,432,087	$ 2,216,953
2019	977,044	1,168,069
2018	595,136	798,327
2017	500,258	699,747
2016		441,456
Prior	770,563	650,638
Revolving loans	1,003,419	838,987
Ending balance	7,150,635	6,814,177
Pass
Loans
Ending balance	6,448,171	6,016,748
Watch
Loans
Ending balance	479,566	554,970
Special Mention
Loans
Ending balance	145,634	150,481
Substandard
Loans
Ending balance	51,895	69,048
Substandard Non-accrual
Loans
Ending balance	25,369	22,930
Commercial
Loans
2021	494,584
2020	275,649	843,404
2019	139,989	190,061
2018	101,782	127,410
2017	91,027	118,185
2016		72,647
Prior	154,513	105,947
Revolving loans	674,318	556,922
Ending balance	1,931,863	2,014,576
Commercial | Pass
Loans
2021	468,833
2020	265,204	812,536
2019	112,809	158,307
2018	90,292	107,565
2017	73,553	93,190
2016		61,847
Prior	132,127	79,970
Revolving loans	575,580	455,340
Ending balance	1,718,398	1,768,755
Commercial | Watch
Loans
2021	15,078
2020	5,355	16,544
2019	19,783	22,247
2018	5,668	14,954
2017	7,545	13,724
2016		2,577
Prior	4,287	10,943
Revolving loans	57,392	55,959
Ending balance	115,108	136,948
Commercial | Special Mention
Loans
2021	3,011
2020	1,143	6,402
2019	2,479	2,671
2018	4,385	2,069
2017	6,864	7,164
2016		6,763
Prior	12,484	13,733
Revolving loans	31,728	33,645
Ending balance	62,094	72,447
Commercial | Substandard
Loans
2021	3,357
2020	3,504	7,772
2019	3,321	3,791
2018	1,437	2,371
2017	1,244	1,939
2016		819
Prior	5,552	1,233
Revolving loans	7,618	9,978
Ending balance	26,033	27,903
Commercial | Substandard Non-accrual
Loans
2021	4,305
2020	444	150
2019	1,597	3,045
2018		451
2017	1,821	2,168
2016		641
Prior	63	68
Revolving loans	2,000	2,000
Ending balance	10,230	8,523
Commercial real estate
Loans
2021	729,627
2020	747,753	840,882
2019	603,588	628,303
2018	374,403	463,787
2017	299,213	437,776
2016		222,941
Prior	291,250	278,923
Revolving loans	22,787	19,923
Ending balance	3,068,622	2,892,535
Commercial real estate | Pass
Loans
2021	655,907
2020	690,244	717,559
2019	463,830	503,977
2018	289,396	360,573
2017	257,618	384,843
2016		180,555
Prior	245,795	227,068
Revolving loans	20,453	18,797
Ending balance	2,623,243	2,393,372
Commercial real estate | Watch
Loans
2021	41,596
2020	40,404	88,297
2019	130,282	110,526
2018	62,312	90,412
2017	27,226	33,734
2016		32,887
Prior	34,572	27,023
Revolving loans	1,878	398
Ending balance	338,270	383,277
Commercial real estate | Special Mention
Loans
2021	27,115
2020	7,056	16,490
2019	7,551	8,858
2018	18,661	10,490
2017	10,436	10,505
2016		7,102
Prior	10,430	21,808
Revolving loans	276	233
Ending balance	81,525	75,486
Commercial real estate | Substandard
Loans
2021	4,894
2020	9,289	17,445
2019	1,574	4,166
2018	2,072	1,491
2017	526	7,812
2016		2,111
Prior	429	1,377
Revolving loans	180	495
Ending balance	18,964	34,897
Commercial real estate | Substandard Non-accrual
Loans
2021	114
2020	761	1,091
2019	352	776
2018	1,962	821
2017	3,407	882
2016		286
Prior	24	1,647
Ending balance	6,620	5,503
Real estate construction
Loans
2021	166,999
2020	150,214	200,184
2019	93,763	175,330
2018	4,193	64,362
2017	2,516	3,306
2016		1,071
Prior	1,372	1,445
Revolving loans	11,801	16,088
Ending balance	430,857	461,786
Real estate construction | Pass
Loans
2021	160,719
2020	141,699	179,232
2019	93,701	171,663
2018	3,918	64,025
2017	899	1,468
2016		761
Prior	1,249	1,444
Revolving loans	11,801	16,088
Ending balance	413,986	434,681
Real estate construction | Watch
Loans
2021	6,279
2020	6,115	18,485
2019	55	3,657
2018	276	337
2017	1,616	1,838
2016		164
Prior	123
Ending balance	14,464	24,481
Real estate construction | Special Mention
Loans
2020		67
2019	7	10
Ending balance	7	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	435,305
2020	233,281	324,112
2019	109,330	164,938
2018	95,015	137,163
2017	97,553	137,949
2016		144,101
Prior	320,771	263,826
Revolving loans	221,629	235,763
Ending balance	1,512,884	1,407,852
Retail Real Estate | Pass
Loans
2021	428,556
2020	230,120	319,302
2019	107,262	162,711
2018	92,875	135,065
2017	95,667	136,427
2016		140,600
Prior	313,708	257,147
Revolving loans	217,984	231,364
Ending balance	1,486,172	1,382,616
Retail Real Estate | Watch
Loans
2021	2,641
2020	2,666	2,715
2019	1,982	2,053
2018	1,521	1,396
2017	352	349
2016		579
Prior	270	233
Revolving loans	2,292	2,939
Ending balance	11,724	10,264
Retail Real Estate | Special Mention
Loans
2021	1,979
2020	29	509
2016		1,962
Ending balance	2,008	2,471
Retail Real Estate | Substandard
Loans
2021	1,630
2020	321	899
2019	14	96
2018	73	56
2017	166	26
2016		727
Prior	2,210	1,631
Revolving loans	84	267
Ending balance	4,498	3,702
Retail Real Estate | Substandard Non-accrual
Loans
2021	500
2020	145	687
2019	72	78
2018	546	646
2017	1,369	1,147
2016		233
Prior	4,582	4,815
Revolving loans	1,268	1,193
Ending balance	8,482	8,799
Retail Other
Loans
2021	45,614
2020	25,188	8,371
2019	30,373	9,437
2018	19,742	5,605
2017	9,949	2,531
2016		696
Prior	2,658	497
Revolving loans	72,885	10,291
Ending balance	206,409	37,428
Retail Other | Pass
Loans
2021	45,614
2020	25,177	8,357
2019	30,366	9,430
2018	19,737	5,600
2017	9,935	2,516
2016		691
Prior	2,658	440
Revolving loans	72,885	10,290
Ending balance	206,372	37,324
Retail Other | Substandard Non-accrual
Loans
2020	11	14
2019	7	7
2018	5	5
2017	14	15
2016		5
Prior		57
Revolving loans		1
Ending balance	37	104
Commercial Loans
Loans
Ending balance	1,931,863	2,014,576
Commercial Real Estate Loans
Loans
Ending balance	3,068,622	2,892,535
Real Estate Construction
Loans
Ending balance	430,857	461,786
Retail Real Estate
Loans
Ending balance	1,512,884	1,407,852
Retail Other
Loans
Ending balance	$ 206,409	$ 37,428

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