| Financing Receivable, Past Due [Table Text Block] |
| | | March 31, 2026 | |
| | | 30-59 Days Past Due | | | 60-89 Days Past Due | | | > 90 Days Past Due | | | Total Past Due | | | Current | | | Total Loans | | | Non-accrual Loans | | | 90 Days or More Past Due and Accruing | |
| Real estate loans: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Construction and land development | | $ | 20 | | | $ | 26 | | | $ | 18 | | | $ | 64 | | | $ | 97,423 | | | $ | 97,487 | | | $ | 44 | | | $ | — | |
| Secured by 1-4 family residential | | | 3,163 | | | | 765 | | | | 1,104 | | | | 5,032 | | | | 515,789 | | | | 520,821 | | | | 2,111 | | | | — | |
| Other real estate loans | | | 241 | | | | 180 | | | | — | | | | 421 | | | | 712,146 | | | | 712,567 | | | | — | | | | — | |
| Commercial and industrial | | | 411 | | | | 498 | | | | 1,517 | | | | 2,426 | | | | 112,776 | | | | 115,202 | | | | 2,290 | | | | — | |
| Consumer and other loans | | | 46 | | | | 29 | | | | — | | | | 75 | | | | 18,254 | | | | 18,329 | | | | — | | | | — | |
| Total | | $ | 3,881 | | | $ | 1,498 | | | $ | 2,639 | | | $ | 8,018 | | | $ | 1,456,388 | | | $ | 1,464,406 | | | $ | 4,445 | | | $ | — | |
| | | December 31, 2025 | |
| | | 30-59 Days Past Due | | | 60-89 Days Past Due | | | > 90 Days Past Due | | | Total Past Due | | | Current | | | Total Loans | | | Non-accrual Loans | | | 90 Days or More Past Due and Accruing | |
| Real estate loans: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Construction and land development | | $ | 30 | | | $ | — | | | $ | 45 | | | $ | 75 | | | $ | 88,349 | | | $ | 88,424 | | | $ | 45 | | | $ | — | |
| Secured by 1-4 family residential | | | 2,034 | | | | 857 | | | | 939 | | | | 3,830 | | | | 523,453 | | | | 527,283 | | | | 1,994 | | | | — | |
| Other real estate loans | | | — | | | | — | | | | — | | | | — | | | | 696,978 | | | | 696,978 | | | | — | | | | — | |
| Commercial and industrial | | | 646 | | | | 520 | | | | 1,324 | | | | 2,490 | | | | 115,454 | | | | 117,944 | | | | 2,615 | | | | — | |
| Consumer and other loans | | | 12 | | | | 23 | | | | — | | | | 35 | | | | 19,081 | | | | 19,116 | | | | — | | | | — | |
| Total | | $ | 2,722 | | | $ | 1,400 | | | $ | 2,308 | | | $ | 6,430 | | | $ | 1,443,315 | | | $ | 1,449,745 | | | $ | 4,654 | | | $ | — | |
|
| Financing Receivable Credit Quality Indicators [Table Text Block] |
| | | March 31, 2026 | | | | | | | | | |
| | | Term Loans by Year of Origination | | | | | | | | | |
| | | 2026 | | | 2025 | | | 2024 | | | 2023 | | | 2022 | | | Prior | | | Revolving | | | Total | |
| Construction and land development | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 5,841 | | | $ | 7,250 | | | $ | 668 | | | $ | 3,470 | | | $ | 1,793 | | | $ | 7,383 | | | $ | 71,038 | | | $ | 97,443 | |
| Special Mention | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | 44 | | | | — | | | | 44 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total construction and land development | | $ | 5,841 | | | $ | 7,250 | | | $ | 668 | | | $ | 3,470 | | | $ | 1,793 | | | $ | 7,427 | | | $ | 71,038 | | | $ | 97,487 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Secured by 1-4 family residential | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 11,672 | | | $ | 29,662 | | | $ | 27,479 | | | $ | 60,134 | | | $ | 97,233 | | | $ | 219,135 | | | $ | 73,618 | | | $ | 518,933 | |
| Special Mention | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Substandard | | | — | | | | — | | | | — | | | | 126 | | | | 321 | | | | 1,441 | | | | — | | | | 1,888 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total secured by 1-4 family residential | | $ | 11,672 | | | $ | 29,662 | | | $ | 27,479 | | | $ | 60,260 | | | $ | 97,554 | | | $ | 220,576 | | | $ | 73,618 | | | $ | 520,821 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 29 | | | $ | — | | | $ | 29 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Other real estate loans | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 30,898 | | | $ | 73,277 | | | $ | 57,919 | | | $ | 93,657 | | | $ | 126,570 | | | $ | 294,728 | | | $ | 33,201 | | | $ | 710,250 | |
| Special Mention | | | — | | | | — | | | | 311 | | | | — | | | | — | | | | 2,006 | | | | — | | | | 2,317 | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total other real estate loans | | $ | 30,898 | | | $ | 73,277 | | | $ | 58,230 | | | $ | 93,657 | | | $ | 126,570 | | | $ | 296,734 | | | $ | 33,201 | | | $ | 712,567 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Commercial and industrial | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 5,341 | | | $ | 10,351 | | | $ | 14,950 | | | $ | 13,488 | | | $ | 13,381 | | | $ | 21,300 | | | $ | 33,709 | | | $ | 112,520 | |
| Special Mention | | | — | | | | — | | | | 392 | | | | — | | | | — | | | | — | | | | — | | | | 392 | |
| Substandard | | | — | | | | — | | | | — | | | | 472 | | | | 1,013 | | | | 276 | | | | — | | | | 1,761 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | 529 | | | | — | | | | 529 | |
| Total commercial and industrial | | $ | 5,341 | | | $ | 10,351 | | | $ | 15,342 | | | $ | 13,960 | | | $ | 14,394 | | | $ | 22,105 | | | $ | 33,709 | | | $ | 115,202 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | 262 | | | $ | 192 | | | $ | 126 | | | $ | — | | | $ | 580 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Consumer and other loans | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 1,483 | | | $ | 3,925 | | | $ | 1,770 | | | $ | 2,173 | | | $ | 4,049 | | | $ | 2,444 | | | $ | 2,484 | | | $ | 18,328 | |
| Special Mention | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | 1 | | | | — | | | | 1 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total consumer and other loans | | $ | 1,483 | | | $ | 3,925 | | | $ | 1,770 | | | $ | 2,173 | | | $ | 4,049 | | | $ | 2,445 | | | $ | 2,484 | | | $ | 18,329 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | 87 | | | $ | — | | | $ | — | | | $ | 13 | | | $ | — | | | $ | — | | | $ | — | | | $ | 100 | |
| | | December 31, 2025 | | | | | | | | | |
| | | Term Loans by Year of Origination | | | | | | | | | |
| | | 2025 | | | 2024 | | | 2023 | | | 2022 | | | 2021 | | | Prior | | | Revolving | | | Total | |
| Construction and land development | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 7,661 | | | $ | 674 | | | $ | 3,505 | | | $ | 1,999 | | | $ | 3,578 | | | $ | 4,079 | | | $ | 66,883 | | | $ | 88,379 | |
| Special Mention | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | 45 | | | | — | | | | 45 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total construction and land development | | $ | 7,661 | | | $ | 674 | | | $ | 3,505 | | | $ | 1,999 | | | $ | 3,578 | | | $ | 4,124 | | | $ | 66,883 | | | $ | 88,424 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 22 | | | $ | — | | | $ | 22 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Secured by 1-4 family residential | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 37,248 | | | $ | 29,544 | | | $ | 61,183 | | | $ | 100,324 | | | $ | 91,044 | | | $ | 135,178 | | | $ | 70,577 | | | $ | 525,098 | |
| Special Mention | | | — | | | | 119 | | | | — | | | | — | | | | — | | | | — | | | | — | | | | 119 | |
| Substandard | | | — | | | | — | | | | 29 | | | | 210 | | | | 343 | | | | 1,484 | | | | — | | | | 2,066 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total secured by 1-4 family residential | | $ | 37,248 | | | $ | 29,663 | | | $ | 61,212 | | | $ | 100,534 | | | $ | 91,387 | | | $ | 136,662 | | | $ | 70,577 | | | $ | 527,283 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 59 | | | $ | — | | | $ | 59 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Other real estate loans | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 67,088 | | | $ | 59,352 | | | $ | 95,653 | | | $ | 130,268 | | | $ | 105,813 | | | $ | 201,768 | | | $ | 32,327 | | | $ | 692,269 | |
| Special Mention | | | — | | | | 313 | | | | — | | | | — | | | | — | | | | 4,146 | | | | — | | | | 4,459 | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | 250 | | | | — | | | | 250 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total other real estate loans | | $ | 67,088 | | | $ | 59,665 | | | $ | 95,653 | | | $ | 130,268 | | | $ | 105,813 | | | $ | 206,164 | | | $ | 32,327 | | | $ | 696,978 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 7 | | | $ | — | | | $ | 7 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Commercial and industrial | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 11,592 | | | $ | 16,531 | | | $ | 13,637 | | | $ | 14,373 | | | $ | 13,054 | | | $ | 11,088 | | | $ | 33,469 | | | $ | 113,744 | |
| Special Mention | | | — | | | | 400 | | | | — | | | | 1,072 | | | | — | | | | — | | | | — | | | | 1,472 | |
| Substandard | | | — | | | | — | | | | 751 | | | | 1,062 | | | | 386 | | | | — | | | | — | | | | 2,199 | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | 529 | | | | — | | | | 529 | |
| Total commercial and industrial | | $ | 11,592 | | | $ | 16,931 | | | $ | 14,388 | | | $ | 16,507 | | | $ | 13,440 | | | $ | 11,617 | | | $ | 33,469 | | | $ | 117,944 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | — | | | $ | 671 | | | $ | 701 | | | $ | 1,930 | | | $ | 481 | | | $ | 438 | | | $ | — | | | $ | 4,221 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Consumer and other loans | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Pass | | $ | 4,974 | | | $ | 2,155 | | | $ | 2,405 | | | $ | 4,252 | | | $ | 91 | | | $ | 2,671 | | | $ | 2,568 | | | $ | 19,116 | |
| Special Mention | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Substandard | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Doubtful | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Total consumer and other loans | | $ | 4,974 | | | $ | 2,155 | | | $ | 2,405 | | | $ | 4,252 | | | $ | 91 | | | $ | 2,671 | | | $ | 2,568 | | | $ | 19,116 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Current period gross write-offs | | $ | 469 | | | $ | 10 | | | $ | 12 | | | $ | — | | | $ | — | | | $ | 5 | | | $ | — | | | $ | 496 | |
|