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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