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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Contracts | Contract       2
Total Pre-Modification Outstanding Recorded Investment       $ 69
Post- Modification Outstanding Recorded Investment $ 405 $ 0 $ 429 68
Troubled Debt Restructuring [Policy Text Block]       $ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract       1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 0 0 $ 16
Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Contracts | Contract       2
Total Pre-Modification Outstanding Recorded Investment       $ 69
Post- Modification Outstanding Recorded Investment 405   429 68
Troubled Debt Restructuring [Policy Text Block]       $ 0
Senior Lien | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of Contracts | Contract       2
Total Pre-Modification Outstanding Recorded Investment       $ 69
Post- Modification Outstanding Recorded Investment 405   429 68
Troubled Debt Restructuring [Policy Text Block]       0
Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       0
Post- Modification Outstanding Recorded Investment 161   161  
Extended Maturity [Member] | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       $ 0
Post- Modification Outstanding Recorded Investment 161   161  
Extended Maturity [Member] | Loans to individuals [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract       1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default       $ 16
Extended Maturity [Member] | Senior Lien | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       $ 0
Post- Modification Outstanding Recorded Investment 161   161  
Extended Maturity [Member] | Automobiles | Loans to individuals [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract       1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default       $ 16
Contractual Interest Rate Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       10
Post- Modification Outstanding Recorded Investment 0   24  
Contractual Interest Rate Reduction [Member] | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       10
Post- Modification Outstanding Recorded Investment 0   24  
Contractual Interest Rate Reduction [Member] | Senior Lien | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       10
Post- Modification Outstanding Recorded Investment $ 0   $ 24  
Contractual Payment Modification [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       59
Contractual Payment Modification [Member] | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       59
Contractual Payment Modification [Member] | Senior Lien | Residential real estate [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Total Pre-Modification Outstanding Recorded Investment       $ 59