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Allowance for Credit Losses - Credit risk profile of loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | $ 92,262 |  | $ 255,765
Prior year | 243,419 |  | 458,326
Two years before current year | 458,324 |  | 361,138
Three years before current year | 362,485 |  | 210,908
Four years before current year | 197,887 |  | 98,537
Prior | 490,654 |  | 446,015
Revolving Loans | 172,959 |  | 177,744
Total loans | 2,017,990 |  | 2,008,433
Current period gross charge offs, Total | 3,192 | $ 4,376 |
Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 87,591 |  | 348,183
Prior year | 331,927 |  | 317,948
Two years before current year | 294,783 |  | 151,284
Three years before current year | 139,039 |  | 91,864
Four years before current year | 81,985 |  | 33,181
Prior | 154,745 |  | 131,427
Revolving Loans | 71,628 |  | 72,484
Total loans | 1,161,698 |  | 1,146,371
Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year |  |  | 232
Prior year | 258 |  | 1,189
Two years before current year | 1,201 |  | 756
Three years before current year | 722 |  | 757
Four years before current year | 689 |  | 598
Prior | 2,028 |  | 1,735
Revolving Loans | 63 |  | 1
Total loans | 4,961 |  | 5,268
Total other loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 87,591 |  | 348,415
Prior year | 332,185 |  | 319,137
Two years before current year | 295,984 |  | 152,040
Three years before current year | 139,761 |  | 92,621
Four years before current year | 82,674 |  | 33,779
Prior | 156,773 |  | 133,162
Revolving Loans | 71,691 |  | 72,485
Total loans | 1,166,659 |  | 1,151,639
Residential | First Liens |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 12,945 |  | 49,146
Prior year | 49,273 |  | 71,073
Two years before current year | 70,491 |  | 65,232
Three years before current year | 63,845 |  | 36,816
Four years before current year | 35,212 |  | 15,242
Prior | 130,045 |  | 119,591
Revolving Loans | 1,148 |  | 1,066
Total loans | 362,959 |  | 358,166
Current period gross charge offs, Prior | 14 |  | 167
Current period gross charge offs, Total | 14 |  | 167
Residential | First Liens | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 12,945 |  | 49,146
Prior year | 49,273 |  | 70,952
Two years before current year | 70,240 |  | 65,232
Three years before current year | 63,845 |  | 36,751
Four years before current year | 35,147 |  | 15,185
Prior | 128,738 |  | 118,087
Revolving Loans | 1,148 |  | 1,066
Total loans | 361,336 |  | 356,419
Residential | First Liens | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior year |  |  | 121
Two years before current year | 251 |  |
Three years before current year |  |  | 65
Four years before current year | 65 |  | 57
Prior | 1,307 |  | 1,504
Total loans | 1,623 |  | 1,747
Residential | Home Equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year |  |  | 61
Prior year | 61 |  | 90
Two years before current year | 113 |  |
Three years before current year |  |  | 24
Four years before current year | 24 |  | 378
Prior | 1,510 |  | 926
Revolving Loans | 63,755 |  | 64,102
Total loans | 65,463 |  | 65,581
Residential | Home Equity | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year |  |  | 61
Prior year | 61 |  | 68
Two years before current year | 45 |  |
Three years before current year |  |  | 7
Four years before current year | 7 |  | 378
Prior | 1,456 |  | 866
Revolving Loans | 63,704 |  | 64,102
Total loans | 65,273 |  | 65,482
Residential | Home Equity | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior year |  |  | 22
Two years before current year | 68 |  |
Three years before current year |  |  | 17
Four years before current year | 17 |  |
Prior | 54 |  | 60
Revolving Loans | 51 |  |
Total loans | 190 |  | 99
Residential | Junior Liens |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 2,654 |  | 15,050
Prior year | 14,561 |  | 15,484
Two years before current year | 14,732 |  | 8,293
Three years before current year | 7,854 |  | 5,661
Four years before current year | 5,337 |  | 4,280
Prior | 11,625 |  | 8,197
Revolving Loans | 1,623 |  | 1,698
Total loans | 58,386 |  | 58,663
Current period gross charge offs, 2020 |  |  | 24
Current period gross charge offs, Prior |  |  | 24
Current period gross charge offs, Total |  |  | 48
Residential | Junior Liens | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 2,654 |  | 15,050
Prior year | 14,561 |  | 15,431
Two years before current year | 14,691 |  | 8,248
Three years before current year | 7,813 |  | 5,557
Four years before current year | 5,235 |  | 4,280
Prior | 11,490 |  | 8,094
Revolving Loans | 1,623 |  | 1,698
Total loans | 58,067 |  | 58,358
Residential | Junior Liens | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior year |  |  | 53
Two years before current year | 41 |  | 45
Three years before current year | 41 |  | 104
Four years before current year | 102 |  |
Prior | 135 |  | 103
Total loans | 319 |  | 305
Residential | All Other Residential |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 224 |  | 6,432
Prior year | 8,087 |  | 9,477
Two years before current year | 8,659 |  | 3,146
Three years before current year | 3,058 |  | 421
Four years before current year | 408 |  | 1,031
Prior | 1,931 |  | 1,549
Revolving Loans | 185 |  | 415
Total loans | 22,552 |  | 22,471
Current period gross charge offs, Prior |  |  | 1
Current period gross charge offs, Total |  |  | 1
Residential | All Other Residential | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 224 |  | 6,432
Prior year | 8,087 |  | 9,477
Two years before current year | 8,659 |  | 3,100
Three years before current year | 2,999 |  | 421
Four years before current year | 408 |  | 641
Prior | 1,525 |  | 1,511
Revolving Loans | 185 |  | 415
Total loans | 22,087 |  | 21,997
Residential | All Other Residential | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Two years before current year |  |  | 46
Three years before current year | 59 |  |
Four years before current year |  |  | 390
Prior | 406 |  | 38
Total loans | 465 |  | 474
Consumer | Motor Vehicle |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 68,820 |  | 265,165
Prior year | 249,346 |  | 216,098
Two years before current year | 196,211 |  | 71,446
Three years before current year | 61,640 |  | 47,471
Four years before current year | 39,772 |  | 12,172
Prior | 10,444 |  | 2,207
Total loans | 626,233 |  | 614,559
Current period gross charge offs, 2024 |  |  | 841
Current period gross charge offs, 2023 | 680 |  | 7,722
Current period gross charge offs, 2022 | 1,285 |  | 3,101
Current period gross charge offs, 2021 | 633 |  | 1,448
Current period gross charge offs, 2020 | 185 |  | 499
Current period gross charge offs, Prior | 43 |  | 174
Current period gross charge offs, Total | 2,826 |  | 13,785
Consumer | Motor Vehicle | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 68,820 |  | 264,933
Prior year | 249,124 |  | 215,125
Two years before current year | 195,414 |  | 70,926
Three years before current year | 61,139 |  | 46,939
Four years before current year | 39,299 |  | 12,038
Prior | 10,326 |  | 2,177
Total loans | 624,122 |  | 612,138
Consumer | Motor Vehicle | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year |  |  | 232
Prior year | 222 |  | 973
Two years before current year | 797 |  | 520
Three years before current year | 501 |  | 532
Four years before current year | 473 |  | 134
Prior | 118 |  | 30
Total loans | 2,111 |  | 2,421
Consumer | All Other Consumer |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 2,948 |  | 12,561
Prior year | 10,857 |  | 6,915
Two years before current year | 5,778 |  | 3,923
Three years before current year | 3,364 |  | 2,228
Four years before current year | 1,921 |  | 676
Prior | 1,218 |  | 692
Revolving Loans | 4,980 |  | 5,204
Total loans | 31,066 |  | 32,199
Current period gross charge offs, 2024 |  |  | 61
Current period gross charge offs, 2023 | 46 |  | 213
Current period gross charge offs, 2022 | 25 |  | 61
Current period gross charge offs, 2021 | 3 |  | 37
Current period gross charge offs, 2020 | 7 |  | 3
Current period gross charge offs, Prior | 5 |  | 5
Current period gross charge offs, Revolving Loans | 35 |  | 149
Current period gross charge offs, Total | 121 |  | 529
Consumer | All Other Consumer | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Current year | 2,948 |  | 12,561
Prior year | 10,821 |  | 6,895
Two years before current year | 5,734 |  | 3,778
Three years before current year | 3,243 |  | 2,189
Four years before current year | 1,889 |  | 659
Prior | 1,210 |  | 692
Revolving Loans | 4,968 |  | 5,203
Total loans | 30,813 |  | 31,977
Consumer | All Other Consumer | Nonperforming Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior year | 36 |  | 20
Two years before current year | 44 |  | 145
Three years before current year | 121 |  | 39
Four years before current year | 32 |  | 17
Prior | 8 |  |
Revolving Loans | 12 |  | 1
Total loans | $ 253 |  | $ 222

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