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Organization and Summary of Significant Accounting Policies - Accounting standard updates (ASU) (Details) - USD ($)
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Accounting standard updates ("ASU")      
Loans held for investment $ 1,077,629,000 $ 939,992,000  
Stockholders' equity 129,687,000 $ 128,650,000 $ 127,280,000
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 | Pro Forma      
Accounting standard updates ("ASU")      
Stockholders' equity (825,000)    
Allowance for credit losses 1,200,000    
LIBOR      
Accounting standard updates ("ASU")      
Loans held for investment $ 469,400,000