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Investments - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
security
Schedule of Held-to-Maturity Securities [Line Items]            
Allowance for credit losses related to HTM securities $ 0   $ 0   $ 0  
Number of securities in unrealized loss position | security 20   20     17
Investment securities held-to-maturity, at cost $ 15,840,000   $ 15,840,000     $ 14,292,000
Sales or transfers of investment securities 0 $ 0 0 $ 0    
Realized gains or losses on investment securities $ 0 $ 0 $ 0 $ 0    
Collateralized mortgage obligations            
Schedule of Held-to-Maturity Securities [Line Items]            
Number of securities in unrealized loss position | security 11   11     8
Investment securities held-to-maturity, at cost $ 8,610,000   $ 8,610,000     $ 6,205,000
Mortgage-backed securities            
Schedule of Held-to-Maturity Securities [Line Items]            
Number of securities in unrealized loss position | security 9   9     9
Investment securities held-to-maturity, at cost $ 7,230,000   $ 7,230,000     $ 8,087,000
Asset Pledged as Collateral | Federal Reserve Bank Advances            
Schedule of Held-to-Maturity Securities [Line Items]            
Investment securities held-to-maturity, at cost $ 14,200,000   $ 14,200,000