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Bank segment - Credit risk profile - payment activity and assigned grades (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Credit risk profile by internally assigned grade for loans    
2021 $ 353,900 $ 1,339,586
2020 1,271,692 590,363
2019 526,201 382,648
2018 344,064 335,784
2017 305,801 368,904
Prior 1,424,280 1,172,236
Revolving 1,036,112 1,093,287
Converted to term loans 63,720 62,418
Total 5,325,770 5,345,226
Real estate    
Credit risk profile by internally assigned grade for loans    
Total 4,167,255 4,239,745
Real estate | Residential 1-4 family    
Credit risk profile by internally assigned grade for loans    
2021 150,713 567,282
2020 549,607 219,464
2019 188,299 111,243
2018 97,991 204,269
2017 179,131 184,888
Prior 941,796 857,093
Revolving 0 0
Converted to term loans 0 0
Total 2,107,537 2,144,239
Real estate | Home equity line of credit    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 863,279 929,388
Converted to term loans 38,183 34,190
Total 901,462 963,578
Real estate | Residential land    
Credit risk profile by internally assigned grade for loans    
2021 2,794 8,357
2020 8,354 3,427
2019 2,884 1,598
2018 1,290 939
2017 855 22
Prior 1,291 1,274
Revolving 0 0
Converted to term loans 0 0
Total 17,468 15,617
Real estate | Residential construction    
Credit risk profile by internally assigned grade for loans    
2021 1,114 6,919
2020 7,865 3,093
2019 3,344 385
2018 383 625
2017 659 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 13,365 11,022
Real estate | Commercial real estate    
Credit risk profile by internally assigned grade for loans    
2021 23,091 280,864
2020 279,866 114,426
2019 113,628 124,301
2018 122,286 64,087
2017 81,637 127,799
Prior 381,460 261,388
Revolving 11,000 11,000
Converted to term loans 0 0
Total 1,012,968 983,865
Real estate | Commercial construction    
Credit risk profile by internally assigned grade for loans    
2021 245 16,390
2020 23,818 31,965
2019 39,513 26,990
2018 26,990 18,000
2017 0 5,562
Prior 2,917 0
Revolving 20,972 22,517
Converted to term loans 0 0
Total 114,455 121,424
Consumer    
Credit risk profile by internally assigned grade for loans    
2021 6,783 29,546
2020 25,838 69,325
2019 59,337 38,635
2018 30,838 7,646
2017 4,484 307
Prior 478 348
Revolving 16,717 18,848
Converted to term loans 4,036 4,078
Total 148,511 168,733
Commercial    
Credit risk profile by internally assigned grade for loans    
2021 169,160 430,228
2020 376,344 148,663
2019 119,196 79,496
2018 64,286 40,218
2017 39,035 50,326
Prior 96,338 52,133
Revolving 124,144 111,534
Converted to term loans 21,501 24,150
Total 1,010,004 936,748
Pass | Real estate | Commercial real estate    
Credit risk profile by internally assigned grade for loans    
2021 23,091 270,603
2020 274,952 63,301
2019 69,384 62,168
2018 60,627 28,432
2017 28,174 55,089
Prior 222,617 155,654
Revolving 11,000 11,000
Converted to term loans 0 0
Total 689,845 646,247
Pass | Real estate | Commercial construction    
Credit risk profile by internally assigned grade for loans    
2021 0 14,480
2020 21,414 31,965
2019 39,513 26,990
2018 26,990 0
2017 0 5,562
Prior 2,917 0
Revolving 20,972 22,517
Converted to term loans 0 0
Total 111,806 101,514
Pass | Commercial    
Credit risk profile by internally assigned grade for loans    
2021 169,095 392,088
2020 337,753 117,791
2019 96,251 75,533
2018 60,462 29,211
2017 28,545 12,520
Prior 51,072 35,770
Revolving 91,178 74,520
Converted to term loans 19,666 11,004
Total 854,022 748,437
Special Mention | Real estate | Commercial real estate    
Credit risk profile by internally assigned grade for loans    
2021 0 10,261
2020 4,914 36,405
2019 29,597 57,952
2018 57,489 33,763
2017 51,586 68,287
Prior 97,247 48,094
Revolving 0 0
Converted to term loans 0 0
Total 240,833 254,762
Special Mention | Real estate | Commercial construction    
Credit risk profile by internally assigned grade for loans    
2021 245 1,910
2020 2,404 0
2019 0 0
2018 0 18,000
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 2,649 19,910
Special Mention | Commercial    
Credit risk profile by internally assigned grade for loans    
2021 65 37,836
2020 38,316 23,087
2019 15,024 1,920
2018 1,820 6,990
2017 6,725 30,264
Prior 33,990 13,250
Revolving 26,301 31,362
Converted to term loans 26 11,218
Total 122,267 155,927
Substandard | Real estate | Commercial real estate    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 14,720
2019 14,647 4,181
2018 4,170 1,892
2017 1,877 4,423
Prior 61,596 57,640
Revolving 0 0
Converted to term loans 0 0
Total 82,290 82,856
Substandard | Real estate | Commercial construction    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
Substandard | Commercial    
Credit risk profile by internally assigned grade for loans    
2021 0 304
2020 275 7,785
2019 7,921 2,043
2018 2,004 4,017
2017 3,765 7,542
Prior 11,276 3,113
Revolving 6,665 5,265
Converted to term loans 1,809 1,928
Total 33,715 31,997
Doubtful | Real estate | Commercial real estate    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
Doubtful | Real estate | Commercial construction    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
Doubtful | Commercial    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 387
Converted to term loans 0 0
Total 0 387
Current | Real estate | Residential 1-4 family    
Credit risk profile by internally assigned grade for loans    
2021 150,713 567,282
2020 549,327 218,988
2019 184,339 111,243
2018 97,560 203,916
2017 179,131 184,888
Prior 934,471 849,788
Revolving 0 0
Converted to term loans 0 0
Total 2,095,541 2,136,105
Current | Real estate | Home equity line of credit    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 861,116 927,106
Converted to term loans 36,792 33,228
Total 897,908 960,334
Current | Real estate | Residential land    
Credit risk profile by internally assigned grade for loans    
2021 2,794 8,357
2020 8,354 3,427
2019 2,884 1,598
2018 1,290 939
2017 855 22
Prior 292 272
Revolving 0 0
Converted to term loans 0 0
Total 16,469 14,615
Current | Real estate | Residential construction    
Credit risk profile by internally assigned grade for loans    
2021 1,114 6,919
2020 7,865 3,093
2019 3,344 385
2018 383 625
2017 659 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 13,365 11,022
Current | Consumer    
Credit risk profile by internally assigned grade for loans    
2021 6,658 28,818
2020 25,307 67,159
2019 57,781 37,072
2018 29,734 7,207
2017 4,219 293
Prior 475 348
Revolving 16,332 18,351
Converted to term loans 3,729 3,758
Total 144,235 163,006
30-59 days past due | Real estate | Residential 1-4 family    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 280 0
2019 0 0
2018 0 0
2017 0 0
Prior 2,081 2,629
Revolving 0 0
Converted to term loans 0 0
Total 2,361 2,629
30-59 days past due | Real estate | Home equity line of credit    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 659 552
Converted to term loans 473 298
Total 1,132 850
30-59 days past due | Real estate | Residential land    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 699 702
Revolving 0 0
Converted to term loans 0 0
Total 699 702
30-59 days past due | Real estate | Residential construction    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
30-59 days past due | Consumer    
Credit risk profile by internally assigned grade for loans    
2021 125 406
2020 164 1,085
2019 577 727
2018 452 155
2017 90 4
Prior 1 0
Revolving 106 138
Converted to term loans 125 90
Total 1,640 2,605
60-89 days past due | Real estate | Residential 1-4 family    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 476
2019 3,018 0
2018 431 0
2017 0 0
Prior 1,954 2,314
Revolving 0 0
Converted to term loans 0 0
Total 5,403 2,790
60-89 days past due | Real estate | Home equity line of credit    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 261 267
Converted to term loans 73 75
Total 334 342
60-89 days past due | Real estate | Residential land    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
60-89 days past due | Real estate | Residential construction    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
60-89 days past due | Consumer    
Credit risk profile by internally assigned grade for loans    
2021 0 191
2020 149 549
2019 623 427
2018 372 165
2017 119 3
Prior 1 0
Revolving 80 97
Converted to term loans 92 59
Total 1,436 1,491
Greater than 89 days past due | Real estate | Residential 1-4 family    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 942 0
2018 0 353
2017 0 0
Prior 3,290 2,362
Revolving 0 0
Converted to term loans 0 0
Total 4,232 2,715
Greater than 89 days past due | Real estate | Home equity line of credit    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 1,243 1,463
Converted to term loans 845 589
Total 2,088 2,052
Greater than 89 days past due | Real estate | Residential land    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 300 300
Revolving 0 0
Converted to term loans 0 0
Total 300 300
Greater than 89 days past due | Real estate | Residential construction    
Credit risk profile by internally assigned grade for loans    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Revolving 0 0
Converted to term loans 0 0
Total 0 0
Greater than 89 days past due | Consumer    
Credit risk profile by internally assigned grade for loans    
2021 0 131
2020 218 532
2019 356 409
2018 280 119
2017 56 7
Prior 1 0
Revolving 199 262
Converted to term loans 90 171
Total $ 1,200 $ 1,631