Fair Value Measurement - Schedule of Fair Values and Carrying Amounts, Significant Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest bearing deposits in banks	$ 8,457	$ 9,462
Loans held for sale	4,529	5,204
Accrued interest receivable	4,700	5,200
Deposits
Noninterest bearing	227,202	226,048
Interest bearing	651,261	714,862
Time	311,123	227,984
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	35,473	15,838
Interest bearing deposits in banks	0	0
Investment securities	4,782	4,456
Loans held for sale	0	0
Accrued interest receivable	0	0
Deposits
Noninterest bearing	227,202	226,048
Interest bearing	651,261	714,862
Time	0	0
Borrowed funds
Short-term		0
Long-term	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Construction real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Interest bearing deposits in banks	8,460	9,449
Investment securities	257,589	247,802
Loans held for sale	4,593	5,303
Accrued interest receivable	904	1,226
Deposits
Noninterest bearing	0	0
Interest bearing	0	0
Time	310,664	226,890
Borrowed funds
Short-term		28,946
Long-term	272,604	229,613
Subordinated notes	17,060	16,128
Accrued interest payable	3,130	3,319
Significant Other Observable Inputs (Level 2) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2) | Construction real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2) | Total commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Other Observable Inputs (Level 2) | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Interest bearing deposits in banks	0	0
Investment securities	0	0
Loans held for sale	0	0
Accrued interest receivable	4,685	5,244
Deposits
Noninterest bearing	0	0
Interest bearing	0	0
Time	0	0
Borrowed funds
Short-term		0
Long-term	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Significant Unobservable Inputs (Level 3) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	442,699	425,103
Significant Unobservable Inputs (Level 3) | Construction real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	111,659	103,672
Significant Unobservable Inputs (Level 3) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	414,144	395,713
Significant Unobservable Inputs (Level 3) | Total commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	31,542	33,096
Significant Unobservable Inputs (Level 3) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,627	2,477
Significant Unobservable Inputs (Level 3) | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	118,201	108,163
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	35,473	15,838
Interest bearing deposits in banks	8,457	9,462
Investment securities	262,371	252,258
Loans held for sale	4,529	5,204
Accrued interest receivable	5,589	6,470
Nonmarketable equity securities	12,161	11,352
Deposits
Noninterest bearing	227,202	226,048
Interest bearing	651,261	714,862
Time	311,123	227,984
Borrowed funds
Short-term		29,000
Long-term	270,841	230,696
Subordinated notes	16,299	16,273
Accrued interest payable	3,130	3,319
Carrying Amount | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	468,599	464,691
Carrying Amount | Construction real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	112,407	105,633
Carrying Amount | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	430,758	432,173
Carrying Amount | Total commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	32,467	34,863
Carrying Amount | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,659	2,522
Carrying Amount | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	121,093	110,336
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	35,473	15,838
Interest bearing deposits in banks	8,460	9,449
Investment securities	262,371	252,258
Loans held for sale	4,593	5,303
Accrued interest receivable	5,589	6,470
Deposits
Noninterest bearing	227,202	226,048
Interest bearing	651,261	714,862
Time	310,664	226,890
Borrowed funds
Short-term		28,946
Long-term	272,604	229,613
Subordinated notes	17,060	16,128
Accrued interest payable	3,130	3,319
Estimated Fair Value | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	442,699	425,103
Estimated Fair Value | Construction real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	111,659	103,672
Estimated Fair Value | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	414,144	395,713
Estimated Fair Value | Total commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	31,542	33,096
Estimated Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,627	2,477
Estimated Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 118,201	$ 108,163