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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale securities, debt maturities, amortized cost [Abstract]    
Due in one year or less $ 13,259  
Due after one year through five years 12,485  
Due after five years through ten years 13,858  
Due after ten years 13,968  
Sub-total 53,570  
Amortized cost 125,205 $ 111,221
Available-for-sale securities, debt maturities, Estimated Fair Value [Abstract]    
Due in one year or less 13,276  
Due after one year through five years 12,359  
Due after five years through ten years 13,201  
Due after ten years 12,315  
Sub-total 51,151  
Available-for-sale securities, debt maturities, fair value, totals 121,252  
Held-to-maturity Securities, debt maturities, amortized cost [Abstract]    
Due in one year or less 2,812  
Due after one year through five years 20,137  
Due after five years through ten years 20,762  
Due after ten years 17,568  
Sub-total 61,279  
Held-to-maturity securities, debt maturities, Amortized Cost 120,549 122,988
Held-to-maturity Securities, debt maturities, Estimated Fair Value [Abstract]    
Due in one year or less 2,818  
Due after one year through five years 19,536  
Due after five years through ten years 20,032  
Due after ten years 16,106  
Sub-total 58,492  
Held-to-maturity securities at fair value 117,088 124,148
Residential Mortgage-Backed - US Agency [Member]    
Available-for-sale securities, debt maturities, amortized cost [Abstract]    
Amortized cost 20,112 19,012
Available-for-sale securities, debt maturities, Estimated Fair Value [Abstract]    
Available-for-sale securities, debt maturities, fair value, totals 20,146  
Held-to-maturity Securities, debt maturities, amortized cost [Abstract]    
Held-to-maturity securities, debt maturities, Amortized Cost 13,157 13,715
Held-to-maturity Securities, debt maturities, Estimated Fair Value [Abstract]    
Held-to-maturity securities at fair value 13,411 13,959
Collateralized Mortgage Obligations - US Agency [Member]    
Available-for-sale securities, debt maturities, amortized cost [Abstract]    
Amortized cost 35,843 31,320
Available-for-sale securities, debt maturities, Estimated Fair Value [Abstract]    
Available-for-sale securities, debt maturities, fair value, totals 35,100  
Held-to-maturity Securities, debt maturities, amortized cost [Abstract]    
Held-to-maturity securities, debt maturities, Amortized Cost 22,950 19,607
Held-to-maturity Securities, debt maturities, Estimated Fair Value [Abstract]    
Held-to-maturity securities at fair value 23,151 19,878
Collateralized Mortgage Obligations - Private Label [Member]    
Available-for-sale securities, debt maturities, amortized cost [Abstract]    
Amortized cost 15,680 16,767
Available-for-sale securities, debt maturities, Estimated Fair Value [Abstract]    
Available-for-sale securities, debt maturities, fair value, totals 14,855  
Held-to-maturity Securities, debt maturities, amortized cost [Abstract]    
Held-to-maturity securities, debt maturities, Amortized Cost 23,163 30,256
Held-to-maturity Securities, debt maturities, Estimated Fair Value [Abstract]    
Held-to-maturity securities at fair value $ 22,034 $ 30,238