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Investment Securities, Held-to-maturity Securities, Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Amortized Cost [Abstract]      
Amortized Cost $ 10,701   $ 13,824
Fair Value [Abstract]      
Fair Value 11,646   14,988
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Gross unrecognized losses on held to maturity securities 0   0
Sales and transfers of held to maturity securities 0 $ 0  
Mortgage-Backed Securities and Collateralized Mortgage Obligations - Residential [Member]      
Amortized Cost [Abstract]      
Securities, amortized cost 10,701    
Amortized Cost 10,701   13,824
Fair Value [Abstract]      
Securities, fair value 11,646    
Fair Value $ 11,646   $ 14,988