Portfolio Loans - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans
2022 / 2021	$ 764,975	$ 2,393,701
2021 / 2020	2,171,718	1,296,955
2020 / 2019	1,204,783	845,248
2019/ 2018	720,770	503,186
2018 / 2017	437,590	434,084
Prior	969,849	671,510
Revolving loans	1,003,188	1,044,314
Total	7,272,873	7,188,998
Pass
Loans
Total	6,688,300	6,518,101
Watch
Loans
Total	361,791	463,053
Special Mention
Loans
Total	130,228	121,120
Substandard
Loans
Total	80,066	70,778
Substandard Non-accrual
Loans
Total	12,488	15,946
Commercial
Loans
2022 / 2021	226,627	541,359
2021 / 2020	410,414	239,348
2020 / 2019	195,865	131,390
2019/ 2018	101,522	95,813
2018 / 2017	87,332	83,947
Prior	215,472	142,640
Revolving loans	669,363	709,389
Total	1,906,595	1,943,886
Commercial | Pass
Loans
2022 / 2021	220,582	512,729
2021 / 2020	386,332	228,811
2020 / 2019	187,571	107,877
2019/ 2018	82,617	84,873
2018 / 2017	80,606	74,351
Prior	187,281	122,418
Revolving loans	580,380	616,697
Total	1,725,369	1,747,756
Commercial | Watch
Loans
2022 / 2021	1,641	13,847
2021 / 2020	13,751	5,913
2020 / 2019	4,536	14,274
2019/ 2018	9,391	5,060
2018 / 2017	1,412	1,361
Prior	3,315	2,866
Revolving loans	39,425	50,261
Total	73,471	93,582
Commercial | Special Mention
Loans
2022 / 2021	2,668	7,062
2021 / 2020	4,799	898
2020 / 2019	191	5,961
2019/ 2018	6,125	4,025
2018 / 2017	3,753	6,790
Prior	17,998	11,845
Revolving loans	39,433	32,846
Total	74,967	69,427
Commercial | Substandard
Loans
2022 / 2021	1,736	3,595
2021 / 2020	1,586	3,362
2020 / 2019	3,222	3,136
2019/ 2018	3,248	1,855
2018 / 2017	1,561	1,125
Prior	6,550	5,459
Revolving loans	8,125	7,585
Total	26,028	26,117
Commercial | Substandard Non-accrual
Loans
2022 / 2021		4,126
2021 / 2020	3,946	364
2020 / 2019	345	142
2019/ 2018	141
2018 / 2017		320
Prior	328	52
Revolving loans	2,000	2,000
Total	6,760	7,004
Commercial real estate
Loans
2022 / 2021	316,683	1,051,764
2021 / 2020	1,021,818	687,392
2020 / 2019	648,048	557,336
2019/ 2018	464,112	307,458
2018 / 2017	258,537	257,419
Prior	408,470	240,922
Revolving loans	17,126	17,516
Total	3,134,794	3,119,807
Commercial real estate | Pass
Loans
2022 / 2021	287,524	969,548
2021 / 2020	961,636	637,550
2020 / 2019	608,378	425,850
2019/ 2018	349,992	235,928
2018 / 2017	216,247	200,373
Prior	330,243	198,002
Revolving loans	14,996	15,190
Total	2,769,016	2,682,441
Commercial real estate | Watch
Loans
2022 / 2021	22,162	51,560
2021 / 2020	33,489	38,820
2020 / 2019	23,614	123,324
2019/ 2018	110,412	48,088
2018 / 2017	22,540	46,761
Prior	48,163	32,608
Revolving loans	2,031	2,143
Total	262,411	343,304
Commercial real estate | Special Mention
Loans
2022 / 2021	5,765	9,542
2021 / 2020	5,971	7,060
2020 / 2019	12,850	6,585
2019/ 2018	2,321	10,098
2018 / 2017	7,375	6,357
Prior	18,814	9,870
Revolving loans	99	183
Total	53,195	49,695
Commercial real estate | Substandard
Loans
2022 / 2021	1,232	21,002
2021 / 2020	20,611	3,781
2020 / 2019	3,034	1,218
2019/ 2018	1,028	11,451
2018 / 2017	10,429	521
Prior	11,233	421
Total	47,567	38,394
Commercial real estate | Substandard Non-accrual
Loans
2022 / 2021		112
2021 / 2020	111	181
2020 / 2019	172	359
2019/ 2018	359	1,893
2018 / 2017	1,946	3,407
Prior	17	21
Total	2,605	5,973
Real estate construction
Loans
2022 / 2021	68,943	209,968
2021 / 2020	189,943	130,050
2020 / 2019	133,276	31,987
2019/ 2018	31,765	3,155
2018 / 2017	2,575	2,312
Prior	3,535	1,343
Revolving loans	15,391	7,181
Total	445,428	385,996
Real estate construction | Pass
Loans
2022 / 2021	65,127	202,082
2021 / 2020	184,303	123,491
2020 / 2019	127,358	31,927
2019/ 2018	31,709	3,155
2018 / 2017	2,575	738
Prior	2,004	1,223
Revolving loans	15,391	7,181
Total	428,467	369,797
Real estate construction | Watch
Loans
2022 / 2021	3,816	7,886
2021 / 2020	5,640	4,159
2020 / 2019	3,518	54
2019/ 2018	52
2018 / 2017		1,574
Prior	1,531	120
Total	14,557	13,793
Real estate construction | Special Mention
Loans
2020 / 2019		6
2019/ 2018	4
Total	4	6
Real estate construction | Substandard
Loans
2021 / 2020		2,400
2020 / 2019	2,400
Total	2,400	2,400
Retail real estate
Loans
2022 / 2021	115,800	531,210
2021 / 2020	495,128	217,850
2020 / 2019	207,795	98,409
2019/ 2018	100,808	80,557
2018 / 2017	76,164	83,213
Prior	336,778	285,279
Revolving loans	211,892	216,458
Total	1,544,365	1,512,976
Retail real estate | Pass
Loans
2022 / 2021	114,026	523,541
2021 / 2020	490,691	215,068
2020 / 2019	205,598	96,617
2019/ 2018	99,087	79,158
2018 / 2017	74,589	82,478
Prior	332,410	281,737
Revolving loans	207,390	213,246
Total	1,523,791	1,491,845
Retail real estate | Watch
Loans
2022 / 2021	1,629	4,100
2021 / 2020	1,208	2,460
2020 / 2019	1,830	1,780
2019/ 2018	1,628	1,312
2018 / 2017	1,269	343
Prior	172	150
Revolving loans	3,616	2,229
Total	11,352	12,374
Retail real estate | Special Mention
Loans
2022 / 2021	145	1,965
2021 / 2020	1,892	27
2020 / 2019	25
Total	2,062	1,992
Retail real estate | Substandard
Loans
2022 / 2021		1,369
2021 / 2020	1,095	232
2020 / 2019	224	12
2019/ 2018	93	71
2018 / 2017	70	165
Prior	2,261	1,687
Revolving loans	328	331
Total	4,071	3,867
Retail real estate | Substandard Non-accrual
Loans
2022 / 2021		235
2021 / 2020	242	63
2020 / 2019	118
2019/ 2018		16
2018 / 2017	236	227
Prior	1,935	1,705
Revolving loans	558	652
Total	3,089	2,898
Retail other
Loans
2022 / 2021	36,922	59,400
2021 / 2020	54,415	22,315
2020 / 2019	19,799	26,126
2019/ 2018	22,563	16,203
2018 / 2017	12,982	7,193
Prior	5,594	1,326
Revolving loans	89,416	93,770
Total	241,691	226,333
Retail other | Pass
Loans
2022 / 2021	36,922	59,366
2021 / 2020	54,381	22,305
2020 / 2019	19,799	26,126
2019/ 2018	22,563	16,189
2018 / 2017	12,982	7,180
Prior	5,594	1,326
Revolving loans	89,416	93,770
Total	241,657	226,262
Retail other | Substandard Non-accrual
Loans
2022 / 2021		34
2021 / 2020	34	10
2019/ 2018		14
2018 / 2017		13
Total	34	71
Commercial Loans
Loans
Total	1,906,595	1,943,886
Commercial Real Estate Loans
Loans
Total	3,134,794	3,119,807
Real Estate Construction
Loans
Total	445,428	385,996
Retail real estate
Loans
Total	1,544,365	1,512,976
Retail other
Loans
Total	$ 241,691	$ 226,333