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Loans Held for investment and Allowance for Credit Losses on Loans - Gross charge-offs by year of origination (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Current fiscal year gross charge-offs | $ 87 | $ 236 | $ 136 | $ 266
Fiscal year before current fiscal year gross charge-offs | 1,472 | 264 | 2,003 | 1,967
Two years before current fiscal year gross charge-offs | 253 | 430 | 877 | 1,115
Three years before current fiscal year gross charge-offs | 168 | 47 | 449 | 298
Four years before current fiscal year gross charge-offs | 75 | 94 | 3,894 | 145
Prior gross charge-offs | 66 | 15 | 463 | 435
Revolving Loans Amortized Cost Basis gross charge-offs | 18 |  | 166 | 1,928
Total current-period gross charge-offs | 2,139 | 1,086 | 7,988 | 6,154
Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Fiscal year before current fiscal year gross charge-offs | 29 |  | 29 |
Three years before current fiscal year gross charge-offs |  |  | 17 | 15
Four years before current fiscal year gross charge-offs |  |  | 6 |
Revolving Loans Amortized Cost Basis gross charge-offs |  |  | 58 |
Total current-period gross charge-offs | 29 |  | 110 | 15
Real Estate Portfolio Segment [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Fiscal year before current fiscal year gross charge-offs | 1,006 |  | 1,233 | 12
Two years before current fiscal year gross charge-offs |  | 189 |  | 189
Three years before current fiscal year gross charge-offs |  |  | 1 | 1
Four years before current fiscal year gross charge-offs |  |  |  | 1
Total current-period gross charge-offs | 1,006 | 189 | 1,234 | 203
Real Estate Portfolio Segment [Member] | Construction And Development Less Than Sixty Months [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Four years before current fiscal year gross charge-offs |  |  | 3,744 |
Total current-period gross charge-offs |  |  | 3,744 |
Real Estate Portfolio Segment [Member] | Construction Residential Real Estate Less Than Sixty Months [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Fiscal year before current fiscal year gross charge-offs |  |  | 25 | 3
Total current-period gross charge-offs |  | 0 | 25 | 3
Real Estate Portfolio Segment [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Current fiscal year gross charge-offs |  |  |  | 3
Fiscal year before current fiscal year gross charge-offs | 6 | 24 | 12 | 47
Two years before current fiscal year gross charge-offs |  | 61 | 3 | 61
Three years before current fiscal year gross charge-offs |  |  | 2 | 3
Four years before current fiscal year gross charge-offs | 35 |  | 40 | 4
Prior gross charge-offs | 7 |  | 47 | 57
Total current-period gross charge-offs | 48 | 85 | 104 | 175
Real Estate Portfolio Segment [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Current fiscal year gross charge-offs |  | 20 |  | 20
Fiscal year before current fiscal year gross charge-offs | 3 |  | 3 |
Two years before current fiscal year gross charge-offs | 22 | 25 | 22 | 25
Three years before current fiscal year gross charge-offs | 25 |  | 25 |
Prior gross charge-offs |  | 5 |  | 7
Revolving Loans Amortized Cost Basis gross charge-offs |  |  | 13 | 27
Total current-period gross charge-offs | 50 | 50 | 63 | 79
Real Estate Portfolio Segment [Member] | Agriculture Member |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Fiscal year before current fiscal year gross charge-offs |  | 25 | 10 | 25
Two years before current fiscal year gross charge-offs |  | 8 | 2 | 45
Three years before current fiscal year gross charge-offs | 7 |  | 7 | 13
Four years before current fiscal year gross charge-offs |  |  | 5 |
Revolving Loans Amortized Cost Basis gross charge-offs |  |  | 17 |
Total current-period gross charge-offs | 7 | 33 | 41 | 83
Commercial Non Real Estate Member |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Current fiscal year gross charge-offs | 19 | 50 | 43 | 56
Fiscal year before current fiscal year gross charge-offs | 88 | 91 | 104 | 1,247
Two years before current fiscal year gross charge-offs | 55 | 56 | 203 | 374
Three years before current fiscal year gross charge-offs | 51 | 9 | 178 | 149
Four years before current fiscal year gross charge-offs |  | 84 | 47 | 96
Prior gross charge-offs | 36 | 8 | 346 | 324
Revolving Loans Amortized Cost Basis gross charge-offs | 5 |  | 60 | 1,886
Total current-period gross charge-offs | 254 | 298 | 981 | 4,132
Consumer Non Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Current fiscal year gross charge-offs | 68 | 166 | 93 | 187
Fiscal year before current fiscal year gross charge-offs | 340 | 124 | 587 | 624
Two years before current fiscal year gross charge-offs | 176 | 91 | 647 | 338
Three years before current fiscal year gross charge-offs | 85 | 38 | 219 | 117
Four years before current fiscal year gross charge-offs | 40 | 10 | 52 | 44
Prior gross charge-offs | 23 | 2 | 70 | 47
Revolving Loans Amortized Cost Basis gross charge-offs | 13 |  | 18 | 15
Total current-period gross charge-offs | $ 745 | $ 431 | $ 1,686 | 1,372
Oil and Gas [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Fiscal year before current fiscal year gross charge-offs |  |  |  | 9
Two years before current fiscal year gross charge-offs |  |  |  | 83
Total current-period gross charge-offs |  |  |  | $ 92

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