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Investment Securities - Narrative (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
security
Dec. 31, 2022
USD ($)
security
Sep. 30, 2023
USD ($)
bond
company
state
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]        
AFS allowance     $ 0  
HTM allowance for credit losses $ 0 $ 0 432,000 [1]  
Amortized cost $ 381,906,000 $ 393,896,000 $ 387,806,000  
Number of securities temporarily impaired (security) | security 912 869 941  
Number of securities temporarily impaired for twelve months or more (security) | security 138 300    
Period of temporary impairment 12 months 12 months    
Financing receivable, threshold period past due     30 days  
Debt securities, held-to-maturity, nonaccrual     $ 0  
Amortized cost of securities transferred       $ 89,780,000
Fair value of securities transferred       89,757,000
Net unrealized loss, net of taxes on transferred securities       $ 15,000
Unamortized balance of net unrealized losses transferred $ 67,000 $ 64,000 $ 58,000  
Number of states | state     6  
FHLB stock investment 3,477,000 2,846,000 $ 2,823,000  
Federal reserve bank stock 1,037,000 1,037,000 1,037,000  
Impairment losses     0  
Other equity securities        
Debt Securities, Available-for-sale [Line Items]        
Securities pledged as collateral 343,677,000 350,411,000 383,946,000  
Agency and mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
HTM allowance for credit losses     $ 0  
Municipal Bonds        
Debt Securities, Available-for-sale [Line Items]        
Number of private activity bonds | bond     2  
Amortized cost     $ 19,734,000  
Corporate securities        
Debt Securities, Available-for-sale [Line Items]        
HTM allowance for credit losses   0 220,000  
Amortized cost 29,750,000 34,750,000 $ 34,750,000  
Number of individual companies | company     14  
U.S. Treasury & Agency securities        
Debt Securities, Available-for-sale [Line Items]        
HTM allowance for credit losses     $ 0  
Amortized cost $ 38,100,000 $ 40,100,000 $ 40,100,000  
[1] December 31, 2022 and September 30, 2022 had no allowance for credit losses