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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year gross charge-offs | $ 385 | $ 456
Fiscal year before current fiscal year gross charge-offs | 500 | 882
Two years before current fiscal year gross charge-offs | 207 | 456
Three years before current fiscal year gross charge-offs | 135 | 546
Four years before current fiscal year gross charge-offs | 199 | 269
Prior gross charge-offs | 302 | 384
Revolving Loans Amortized Cost Basis gross charge-offs | 2 | 19
Total current-period gross charge-offs | 1,730 | 3,012
Real Estate [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 | 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 | 853
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Prior gross charge-offs |  | 3
Total current-period gross charge-offs |  | 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 |  | 2
Three years before current fiscal year gross charge-offs |  | 2
Prior gross charge-offs |  |
Total current-period gross charge-offs |  | 4
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Two years before current fiscal year gross charge-offs | 71 | 90
Three years before current fiscal year gross charge-offs | 11 | 32
Prior gross charge-offs | 18 | 22
Total current-period gross charge-offs | 100 | 144
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fiscal year before current fiscal year gross charge-offs |  | 4
Two years before current fiscal year gross charge-offs |  | 19
Four years before current fiscal year gross charge-offs |  | 1
Prior gross charge-offs |  | 4
Total current-period gross charge-offs |  | 28
Real Estate [Member] | Agriculture [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fiscal year before current fiscal year gross charge-offs | 150 | 154
Two years before current fiscal year gross charge-offs | 9 | 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 | 159 | 496
Commercial Non-real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year gross charge-offs | 19 | 61
Fiscal year before current fiscal year gross charge-offs | 15 | 116
Two years before current fiscal year gross charge-offs | 46 | 109
Three years before current fiscal year gross charge-offs |  | 20
Four years before current fiscal year gross charge-offs | 51 | 51
Prior gross charge-offs | 108 | 160
Total current-period gross charge-offs | 239 | 517
Consumer Non-real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year gross charge-offs | 192 | 221
Fiscal year before current fiscal year gross charge-offs | 146 | 408
Two years before current fiscal year gross charge-offs | 56 | 203
Three years before current fiscal year gross charge-offs | 12 | 41
Four years before current fiscal year gross charge-offs | 1 | 38
Prior gross charge-offs | 18 | 35
Revolving Loans Amortized Cost Basis gross charge-offs | 2 | 19
Total current-period gross charge-offs | $ 427 | 965
Oil and Gas [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fiscal year before current fiscal year gross charge-offs |  | 2
Total current-period gross charge-offs |  | $ 2

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