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Fair Value Measurements - Summary of assets and liabilities measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Available-for-sale securities        
Securities available-for-sale, at fair value $ 111,375   $ 148,384  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount   $ 0   $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount   $ 0   $ 0
Mortgage-backed securities - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 94,071   120,881  
CMO's - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 17,304   27,503  
Recurring | (Level 1)        
Available-for-sale securities        
Securities available-for-sale, at fair value 0   0  
Recurring | (Level 1) | Mortgage-backed securities - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 0   0  
Recurring | (Level 1) | CMO's - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 0   0  
Recurring | (Level 2)        
Available-for-sale securities        
Securities available-for-sale, at fair value 111,375   148,384  
Recurring | (Level 2) | Mortgage-backed securities - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 94,071   120,881  
Recurring | (Level 2) | CMO's - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 17,304   27,503  
Recurring | (Level 3)        
Available-for-sale securities        
Securities available-for-sale, at fair value 0   0  
Recurring | (Level 3) | Mortgage-backed securities - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value 0   0  
Recurring | (Level 3) | CMO's - agency        
Available-for-sale securities        
Securities available-for-sale, at fair value $ 0   $ 0