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Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Charges-offs by Year of Orgination (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs $ 465 $ 933
Fiscal year before current fiscal year gross charge-offs 2,298 1,436
Two years before current fiscal year gross charge-offs 1,353 517
Three years before current fiscal year gross charge-offs 367 633
Four years before current fiscal year gross charge-offs 145 277
Prior gross charge-offs 623 425
Revolving Loans Amortized Cost Basis gross charge-offs 2,095 19
Total current-period gross charge-offs 7,346 4,240
Agriculture Member | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Fiscal year before current fiscal year gross charge-offs 40  
Two years before current fiscal year gross charge-offs 47  
Three years before current fiscal year gross charge-offs 13  
Prior gross charge-offs 66  
Total current-period gross charge-offs 166  
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs   174
Fiscal year before current fiscal year gross charge-offs   196
Two years before current fiscal year gross charge-offs   26
Three years before current fiscal year gross charge-offs 15 203
Four years before current fiscal year gross charge-offs   165
Prior gross charge-offs   158
Total current-period gross charge-offs 15 922
Real Estate [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  
Three years before current fiscal year gross charge-offs 1  
Four years before current fiscal year gross charge-offs 1  
Prior gross charge-offs 33 3
Total current-period gross charge-offs 236 3
Real Estate [Member] | Construction and Development Less than 60 Months [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Fiscal year before current fiscal year gross charge-offs   3
Three years before current fiscal year gross charge-offs   2
Prior gross charge-offs   1
Total current-period gross charge-offs   6
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Fiscal year before current fiscal year gross charge-offs 3 94
Total current-period gross charge-offs 3 94
Real Estate [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 47  
Two years before current fiscal year gross charge-offs 61 91
Three years before current fiscal year gross charge-offs 6 44
Four years before current fiscal year gross charge-offs 4 5
Prior gross charge-offs 134 25
Total current-period gross charge-offs 255 165
Real Estate [Member] | Residential Real Estate All Other [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs 20  
Fiscal year before current fiscal year gross charge-offs   4
Two years before current fiscal year gross charge-offs 84 19
Four years before current fiscal year gross charge-offs   1
Prior gross charge-offs 7 36
Revolving Loans Amortized Cost Basis gross charge-offs 60  
Total current-period gross charge-offs 171 60
Real Estate [Member] | Agriculture Member    
Financing Receivable, Credit Quality Indicator [Line Items]    
Fiscal year before current fiscal year gross charge-offs   154
Two years before current fiscal year gross charge-offs   9
Three years before current fiscal year gross charge-offs   317
Four years before current fiscal year gross charge-offs   14
Prior gross charge-offs   2
Total current-period gross charge-offs   496
Commercial Non-real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs 94 390
Fiscal year before current fiscal year gross charge-offs 1,323 351
Two years before current fiscal year gross charge-offs 462 111
Three years before current fiscal year gross charge-offs 191 22
Four years before current fiscal year gross charge-offs 96 51
Prior gross charge-offs 324 160
Revolving Loans Amortized Cost Basis gross charge-offs 2,004  
Total current-period gross charge-offs 4,494 1,085
Consumer Non-real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs 348 312
Fiscal year before current fiscal year gross charge-offs 864 632
Two years before current fiscal year gross charge-offs 427 261
Three years before current fiscal year gross charge-offs 141 45
Four years before current fiscal year gross charge-offs 44 41
Prior gross charge-offs 59 40
Revolving Loans Amortized Cost Basis gross charge-offs 31 19
Total current-period gross charge-offs 1,914 1,350
Oil and Gas [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year gross charge-offs   57
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 $ 59