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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans
2021	$ 833,596
2020	1,813,648	$ 2,216,953
2019	1,071,108	1,168,069
2018	725,875	798,327
2017	588,923	699,747
2016		441,456
Prior	926,024	650,638
Revolving loans	820,126	838,987
Ending balance	6,779,300	6,814,177
Pass
Loans
Ending balance	5,981,995	6,016,748
Watch
Loans
Ending balance	560,431	554,970
Special Mention
Loans
Ending balance	149,831	150,481
Substandard
Loans
Ending balance	65,337	69,048
Substandard Non-accrual
Loans
Ending balance	21,706	22,930
Commercial
Loans
2021	395,625
2020	564,556	843,404
2019	160,763	190,061
2018	115,910	127,410
2017	108,086	118,185
2016		72,647
Prior	159,371	105,947
Revolving loans	563,060	556,922
Ending balance	2,067,371	2,014,576
Commercial | Pass
Loans
2021	388,147
2020	536,074	812,536
2019	131,127	158,307
2018	97,322	107,565
2017	88,238	93,190
2016		61,847
Prior	126,916	79,970
Revolving loans	462,239	455,340
Ending balance	1,830,063	1,768,755
Commercial | Watch
Loans
2021	4,830
2020	14,828	16,544
2019	18,085	22,247
2018	6,890	14,954
2017	9,185	13,724
2016		2,577
Prior	12,947	10,943
Revolving loans	56,625	55,959
Ending balance	123,390	136,948
Commercial | Special Mention
Loans
2021	2,061
2020	4,241	6,402
2019	5,590	2,671
2018	8,369	2,069
2017	6,680	7,164
2016		6,763
Prior	18,831	13,733
Revolving loans	32,774	33,645
Ending balance	78,546	72,447
Commercial | Substandard
Loans
2021	587
2020	8,912	7,772
2019	3,569	3,791
2018	2,993	2,371
2017	1,815	1,939
2016		819
Prior	125	1,233
Revolving loans	9,422	9,978
Ending balance	27,423	27,903
Commercial | Substandard Non-accrual
Loans
2020	501	150
2019	2,392	3,045
2018	336	451
2017	2,168	2,168
2016		641
Prior	552	68
Revolving loans	2,000	2,000
Ending balance	7,949	8,523
Commercial real estate
Loans
2021	230,724
2020	849,553	840,882
2019	608,651	628,303
2018	445,498	463,787
2017	356,979	437,776
2016		222,941
Prior	402,150	278,923
Revolving loans	19,411	19,923
Ending balance	2,912,966	2,892,535
Commercial real estate | Pass
Loans
2021	195,095
2020	732,186	717,559
2019	462,732	503,977
2018	342,786	360,573
2017	315,383	384,843
2016		180,555
Prior	334,934	227,068
Revolving loans	17,330	18,797
Ending balance	2,400,446	2,393,372
Commercial real estate | Watch
Loans
2021	13,209
2020	91,440	88,297
2019	133,721	110,526
2018	89,517	90,412
2017	29,142	33,734
2016		32,887
Prior	48,557	27,023
Revolving loans	1,658	398
Ending balance	407,244	383,277
Commercial real estate | Special Mention
Loans
2021	19,920
2020	9,818	16,490
2019	7,902	8,858
2018	9,949	10,490
2017	7,172	10,505
2016		7,102
Prior	13,716	21,808
Revolving loans	423	233
Ending balance	68,900	75,486
Commercial real estate | Substandard
Loans
2021	2,500
2020	15,325	17,445
2019	3,557	4,166
2018	2,425	1,491
2017	4,400	7,812
2016		2,111
Prior	3,005	1,377
Revolving loans		495
Ending balance	31,212	34,897
Commercial real estate | Substandard Non-accrual
Loans
2020	784	1,091
2019	739	776
2018	821	821
2017	882	882
2016		286
Prior	1,938	1,647
Ending balance	5,164	5,503
Real estate construction
Loans
2021	42,845
2020	181,545	200,184
2019	147,217	175,330
2018	39,627	64,362
2017	2,949	3,306
2016		1,071
Prior	1,836	1,445
Revolving loans	6,614	16,088
Ending balance	422,633	461,786
Real estate construction | Pass
Loans
2021	40,766
2020	167,230	179,232
2019	143,555	171,663
2018	39,297	64,025
2017	1,164	1,468
2016		761
Prior	1,680	1,444
Revolving loans	6,614	16,088
Ending balance	400,306	434,681
Real estate construction | Watch
Loans
2021	2,079
2020	11,915	18,485
2019	3,653	3,657
2018	330	337
2017	1,785	1,838
2016		164
Prior	156
Ending balance	19,918	24,481
Real estate construction | Special Mention
Loans
2020		67
2019	9	10
Ending balance	9	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	162,388
2020	211,145	324,112
2019	146,408	164,938
2018	120,183	137,163
2017	118,946	137,949
2016		144,101
Prior	361,809	263,826
Revolving loans	222,420	235,763
Ending balance	1,343,299	1,407,852
Retail Real Estate | Pass
Loans
2021	161,016
2020	207,536	319,302
2019	144,201	162,711
2018	118,052	135,065
2017	117,359	136,427
2016		140,600
Prior	351,700	257,147
Revolving loans	218,383	231,364
Ending balance	1,318,247	1,382,616
Retail Real Estate | Watch
Loans
2021	189
2020	2,557	2,715
2019	2,040	2,053
2018	1,407	1,396
2017	291	349
2016		579
Prior	846	233
Revolving loans	2,549	2,939
Ending balance	9,879	10,264
Retail Real Estate | Special Mention
Loans
2021	377
2020	33	509
2018	18
2016		1,962
Prior	1,948
Ending balance	2,376	2,471
Retail Real Estate | Substandard
Loans
2021	323
2020	882	899
2019	91	96
2018	56	56
2017	168	26
2016		727
Prior	2,497	1,631
Revolving loans	285	267
Ending balance	4,302	3,702
Retail Real Estate | Substandard Non-accrual
Loans
2021	483
2020	137	687
2019	76	78
2018	650	646
2017	1,128	1,147
2016		233
Prior	4,818	4,815
Revolving loans	1,203	1,193
Ending balance	8,495	8,799
Retail Other
Loans
2021	2,014
2020	6,849	8,371
2019	8,069	9,437
2018	4,657	5,605
2017	1,963	2,531
2016		696
Prior	858	497
Revolving loans	8,621	10,291
Ending balance	33,031	37,428
Retail Other | Pass
Loans
2021	2,014
2020	6,835	8,357
2019	8,062	9,430
2018	4,652	5,600
2017	1,949	2,516
2016		691
Prior	800	440
Revolving loans	8,621	10,290
Ending balance	32,933	37,324
Retail Other | Substandard Non-accrual
Loans
2020	14	14
2019	7	7
2018	5	5
2017	14	15
2016		5
Prior	58	57
Revolving loans		1
Ending balance	98	104
Commercial Loans
Loans
Ending balance	2,067,371	2,014,576
Commercial Real Estate Loans
Loans
Ending balance	2,912,966	2,892,535
Real Estate Construction
Loans
Ending balance	422,633	461,786
Retail Real Estate
Loans
Ending balance	1,343,299	1,407,852
Retail Other
Loans
Ending balance	$ 33,031	$ 37,428

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