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Investment Securities - Narrative (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
bond
company
security
state
Mar. 31, 2023
USD ($)
security
Dec. 31, 2023
USD ($)
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]        
AFS allowance $ 0      
HTM allowance for credit losses 182,000 $ 438,000 $ 434,000  
Amortized Cost 379,635,000 392,283,000 $ 385,669,000  
Gains or losses on the sale of securities $ 0 $ 0    
Number of securities temporarily impaired (security) | security 236 232 226  
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 $ 54,000 $ 60,000 $ 56,000  
Number of states | state 6      
FHLB stock investment $ 4,896,000 2,837,000 2,348,000  
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 314,208,000 324,716,000 340,623,000  
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 $ 19,441,000      
Corporate securities        
Debt Securities, Available-for-sale [Line Items]        
HTM allowance for credit losses 69,000   212,000  
Amortized Cost $ 31,750,000 34,750,000 34,750,000  
Number of individual companies | company 13      
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