Fair Value Measurements and Disclosures - Assets measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Measurements and Disclosures
Available for sale securities	$ 341,878	$ 339,477
Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Level 2
Fair Value Measurements and Disclosures
Available for sale securities	341,878	339,477
Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
U.S. Treasuries
Fair Value Measurements and Disclosures
Available for sale securities	133,792	115,458
Mortgage-backed securities
Fair Value Measurements and Disclosures
Available for sale securities	44,627	47,785
Collateralized mortgage obligations
Fair Value Measurements and Disclosures
Available for sale securities	78,775	95,006
States and political subdivisions
Fair Value Measurements and Disclosures
Available for sale securities	84,684	81,228
Recurring
Fair Value Measurements and Disclosures
Available for sale securities	341,878	339,477
Recurring | Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | Level 2
Fair Value Measurements and Disclosures
Available for sale securities	341,878	339,477
Recurring | Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | U.S. Treasuries
Fair Value Measurements and Disclosures
Available for sale securities	133,792	115,458
Recurring | U.S. Treasuries | Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | U.S. Treasuries | Level 2
Fair Value Measurements and Disclosures
Available for sale securities	133,792	115,458
Recurring | U.S. Treasuries | Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | Mortgage-backed securities
Fair Value Measurements and Disclosures
Available for sale securities	44,627	47,785
Recurring | Mortgage-backed securities | Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | Mortgage-backed securities | Level 2
Fair Value Measurements and Disclosures
Available for sale securities	44,627	47,785
Recurring | Mortgage-backed securities | Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | Collateralized mortgage obligations
Fair Value Measurements and Disclosures
Available for sale securities	78,775	95,006
Recurring | Collateralized mortgage obligations | Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | Collateralized mortgage obligations | Level 2
Fair Value Measurements and Disclosures
Available for sale securities	78,775	95,006
Recurring | Collateralized mortgage obligations | Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | States and political subdivisions
Fair Value Measurements and Disclosures
Available for sale securities	84,684	81,228
Recurring | States and political subdivisions | Level 1
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Recurring | States and political subdivisions | Level 2
Fair Value Measurements and Disclosures
Available for sale securities	84,684	81,228
Recurring | States and political subdivisions | Level 3
Fair Value Measurements and Disclosures
Available for sale securities	0	0
Nonrecurring
Fair Value Measurements and Disclosures
Impaired loans, fair value	0	6
Nonrecurring | Level 1
Fair Value Measurements and Disclosures
Impaired loans, fair value	0	0
Nonrecurring | Level 2
Fair Value Measurements and Disclosures
Impaired loans, fair value	0	0
Nonrecurring | Level 3
Fair Value Measurements and Disclosures
Impaired loans, fair value	$ 0	$ 6