v3.26.1
Allowance for Credit Losses - Credit risk profile of loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]      
Nonperforming loans past due 90 days    
Current year $ 112,444   $ 422,989
Prior year 465,496   448,390
Two years before current year 479,630   266,301
Three years before current year 272,236   427,076
Four years before current year 435,338   357,624
Prior 884,577   552,346
Revolving Loans 248,639   230,987
Total loans 2,898,360   2,705,713
Current period gross charge offs, Total 2,945 $ 3,241  
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 118,819   380,203
Prior year 402,323   256,443
Two years before current year 261,645   170,253
Three years before current year 169,635   166,830
Four years before current year 157,222   84,682
Prior 259,301   163,410
Revolving Loans 141,735   117,651
Total loans 1,510,680   1,339,472
Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year     224
Prior year 471   670
Two years before current year 2,206   719
Three years before current year 733   943
Four years before current year 1,320   357
Prior 1,770   1,878
Revolving Loans 437   458
Total loans 6,937   5,249
Total other loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 118,819   380,427
Prior year 402,794   257,113
Two years before current year 263,851   170,972
Three years before current year 170,368   167,773
Four years before current year 158,542   85,039
Prior 261,071   165,288
Revolving Loans 142,172   118,109
Total loans 1,517,617   1,344,721
Residential | First Liens      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 25,547   64,142
Prior year 83,360   61,845
Two years before current year 86,836   39,526
Three years before current year 54,171   74,359
Four years before current year 79,590   60,965
Prior 224,873   145,766
Revolving Loans 2,381   1,786
Total loans 556,758   448,389
Current period gross charge offs, 2024 9   33
Current period gross charge offs, 2023     31
Current period gross charge offs, Prior 8   11
Current period gross charge offs, Total 17   75
Residential | First Liens | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 25,547   64,142
Prior year 83,278   61,775
Two years before current year 85,554   39,526
Three years before current year 54,171   74,359
Four years before current year 79,082   60,920
Prior 223,641   144,310
Revolving Loans 2,381   1,786
Total loans 553,654   446,818
Residential | First Liens | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior year 82   70
Two years before current year 1,282    
Four years before current year 508   45
Prior 1,232   1,456
Total loans 3,104   1,571
Residential | Home Equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 2,017   338
Prior year 11,440   938
Two years before current year 1,260   793
Three years before current year 958   683
Four years before current year 708   276
Prior 1,925   1,459
Revolving Loans 124,971   102,300
Total loans 143,279   106,787
Current period gross charge offs, 2022     22
Current period gross charge offs, Prior 4   19
Current period gross charge offs, Revolving Loans     10
Current period gross charge offs, Total 4   51
Residential | Home Equity | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 2,017   338
Prior year 11,440   938
Two years before current year 1,027   793
Three years before current year 958   650
Four years before current year 678   259
Prior 1,769   1,284
Revolving Loans 124,577   101,907
Total loans 142,466   106,169
Residential | Home Equity | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Two years before current year 233    
Three years before current year     33
Four years before current year 30   17
Prior 156   175
Revolving Loans 394   393
Total loans 813   618
Residential | Junior Liens      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 5,987   23,832
Prior year 22,927   13,417
Two years before current year 13,722   9,561
Three years before current year 9,394   9,170
Four years before current year 9,364   4,691
Prior 13,171   9,775
Revolving Loans 1,855   2,107
Total loans 76,420   72,553
Current period gross charge offs, 2024     30
Current period gross charge offs, Prior 6   85
Current period gross charge offs, Total 6   115
Residential | Junior Liens | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 5,987   23,832
Prior year 22,893   13,403
Two years before current year 13,674   9,409
Three years before current year 9,291   9,145
Four years before current year 9,290   4,674
Prior 13,083   9,676
Revolving Loans 1,855   2,107
Total loans 76,073   72,246
Residential | Junior Liens | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior year 34   14
Two years before current year 48   152
Three years before current year 103   25
Four years before current year 74   17
Prior 88   99
Total loans 347   307
Residential | All Other Residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 3,414   7,829
Prior year 18,149   6,807
Two years before current year 4,369   3,843
Three years before current year 3,004   4,991
Four years before current year 3,451   3,622
Prior 5,201   1,765
Revolving Loans 250    
Total loans 37,838   28,857
Current period gross charge offs, Prior 38    
Current period gross charge offs, Total 38    
Residential | All Other Residential | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 3,414   7,829
Prior year 18,149   6,807
Two years before current year 4,369   3,843
Three years before current year 3,004   4,991
Four years before current year 3,451   3,573
Prior 5,199   1,757
Revolving Loans 250    
Total loans 37,836   28,800
Residential | All Other Residential | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Four years before current year     49
Prior 2   8
Total loans 2   57
Consumer | Motor Vehicle      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 81,026   279,508
Prior year 261,921   168,763
Two years before current year 153,298   114,456
Three years before current year 100,467   77,048
Four years before current year 64,128   14,313
Prior 13,985   5,569
Revolving Loans 9   9
Total loans 674,834   659,666
Current period gross charge offs, 2025     759
Current period gross charge offs, 2024 629   2,380
Current period gross charge offs, 2023 597   2,279
Current period gross charge offs, 2022 497   4,075
Current period gross charge offs, 2021 668   713
Current period gross charge offs, Prior 115   249
Current period gross charge offs, Total 2,506   10,455
Consumer | Motor Vehicle | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 81,026   279,286
Prior year 261,573   168,244
Two years before current year 152,714   113,956
Three years before current year 99,898   76,182
Four years before current year 63,423   14,119
Prior 13,732   5,441
Revolving Loans 9   9
Total loans 672,375   657,237
Consumer | Motor Vehicle | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year     222
Prior year 348   519
Two years before current year 584   500
Three years before current year 569   866
Four years before current year 705   194
Prior 253   128
Total loans 2,459   2,429
Consumer | All Other Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 828   4,778
Prior year 4,997   5,343
Two years before current year 4,366   2,793
Three years before current year 2,374   1,522
Four years before current year 1,301   1,172
Prior 1,916   954
Revolving Loans 12,706   11,907
Total loans 28,488   28,469
Current period gross charge offs, 2025     13
Current period gross charge offs, 2024 10   246
Current period gross charge offs, 2023 29   180
Current period gross charge offs, 2022 5   53
Current period gross charge offs, 2021 14   44
Current period gross charge offs, Prior 46   24
Current period gross charge offs, Revolving Loans 96   201
Current period gross charge offs, Total 200   761
Consumer | All Other Consumer | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year 828   4,776
Prior year 4,990   5,276
Two years before current year 4,307   2,726
Three years before current year 2,313   1,503
Four years before current year 1,298   1,137
Prior 1,877   942
Revolving Loans 12,663   11,842
Total loans 28,276   28,202
Consumer | All Other Consumer | Nonperforming Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current year     2
Prior year 7   67
Two years before current year 59   67
Three years before current year 61   19
Four years before current year 3   35
Prior 39   12
Revolving Loans 43   65
Total loans $ 212   $ 267