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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]        
Current fiscal year gross charge-offs $ 236 $ 385 $ 266 $ 456
Fiscal year before current fiscal year gross charge-offs 264 500 1,967 882
Two years before current fiscal year gross charge-offs 430 207 1,115 456
Three years before current fiscal year gross charge-offs 47 135 298 546
Four years before current fiscal year gross charge-offs 94 199 145 269
Prior gross charge-offs 15 302 435 384
Revolving Loans Amortized Cost Basis gross charge-offs   2 1,928 19
Total current-period gross charge-offs 1,086 1,730 6,154 3,012
Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current fiscal year gross charge-offs   174   174
Fiscal year before current fiscal year gross charge-offs   189   196
Two years before current fiscal year gross charge-offs   25   26
Three years before current fiscal year gross charge-offs   112 15 134
Four years before current fiscal year gross charge-offs   147   165
Prior gross charge-offs   158   158
Total current-period gross charge-offs   805 15 853
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     12  
Two years before current fiscal year gross charge-offs 189   189  
Three years before current fiscal year gross charge-offs     1  
Four years before current fiscal year gross charge-offs     1  
Prior gross charge-offs       3
Total current-period gross charge-offs 189   203 3
Real Estate Portfolio Segment [Member] | Construction And Development Less Than Sixty Months [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Fiscal year before current fiscal year gross charge-offs       2
Three years before current fiscal year gross charge-offs       2
Total current-period gross charge-offs       4
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     3  
Total current-period gross charge-offs     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 24   47  
Two years before current fiscal year gross charge-offs 61 71 61 90
Three years before current fiscal year gross charge-offs   11 3 32
Four years before current fiscal year gross charge-offs     4  
Prior gross charge-offs   18 57 22
Total current-period gross charge-offs 85 100 175 144
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       4
Two years before current fiscal year gross charge-offs 25   25 19
Four years before current fiscal year gross charge-offs       1
Prior gross charge-offs 5   7 4
Revolving Loans Amortized Cost Basis gross charge-offs     27  
Total current-period gross charge-offs 50   79 28
Real Estate Portfolio Segment [Member] | Agriculture Member        
Financing Receivable, Credit Quality Indicator [Line Items]        
Fiscal year before current fiscal year gross charge-offs 25 150 25 154
Two years before current fiscal year gross charge-offs 8 9 45 9
Three years before current fiscal year gross charge-offs     13 317
Four years before current fiscal year gross charge-offs       14
Prior gross charge-offs       2
Total current-period gross charge-offs 33 159 83 496
Commercial Non Real Estate Member        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current fiscal year gross charge-offs 50 19 56 61
Fiscal year before current fiscal year gross charge-offs 91 15 1,247 116
Two years before current fiscal year gross charge-offs 56 46 374 109
Three years before current fiscal year gross charge-offs 9   149 20
Four years before current fiscal year gross charge-offs 84 51 96 51
Prior gross charge-offs 8 108 324 160
Revolving Loans Amortized Cost Basis gross charge-offs     1,886  
Total current-period gross charge-offs 298 239 4,132 517
Consumer Non Real Estate [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current fiscal year gross charge-offs 166 192 187 221
Fiscal year before current fiscal year gross charge-offs 124 146 624 408
Two years before current fiscal year gross charge-offs 91 56 338 203
Three years before current fiscal year gross charge-offs 38 12 117 41
Four years before current fiscal year gross charge-offs 10 1 44 38
Prior gross charge-offs 2 18 47 35
Revolving Loans Amortized Cost Basis gross charge-offs   2 15 19
Total current-period gross charge-offs $ 431 $ 427 1,372 965
Oil and Gas [Member]        
Financing Receivable, Credit Quality Indicator [Line Items]        
Fiscal year before current fiscal year gross charge-offs     9 2
Two years before current fiscal year gross charge-offs     83  
Total current-period gross charge-offs     $ 92 $ 2