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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