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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost $ 139,335 $ 141,883
Available-for-sale, gross unrealized gains 1 8
Available-for-sale, gross unrealized losses (12,785) (11,096)
Investment securities available-for-sale, at fair value 126,551 130,795
Held-to-maturity, amortized cost 1,272 1,862
Held-to-maturity, gross unrealized losses (89) (93)
Held-to-maturity, estimated fair value 1,183 1,769
Residential Mortgage Backed Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 41,071 47,659
Available-for-sale, gross unrealized gains   2
Available-for-sale, gross unrealized losses (4,071) (3,704)
Investment securities available-for-sale, at fair value 37,000 43,957
Commercial Mortgage Backed Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 10,020 12,169
Available-for-sale, gross unrealized gains 1 4
Available-for-sale, gross unrealized losses (521) (480)
Investment securities available-for-sale, at fair value 9,500 11,693
Held-to-maturity, amortized cost 704 1,167
Held-to-maturity, gross unrealized losses (30) (41)
Held-to-maturity, estimated fair value 674 1,126
US Government Agencies Debt Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 11,851 5,116
Available-for-sale, gross unrealized losses (919) (846)
Investment securities available-for-sale, at fair value 10,932 4,270
Held-to-maturity, amortized cost 502 610
Held-to-maturity, gross unrealized losses (49) (40)
Held-to-maturity, estimated fair value 453 570
US States and Political Subdivisions Debt Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 1,633 2,166
Available-for-sale, gross unrealized losses (90) (94)
Investment securities available-for-sale, at fair value 1,543 2,072
Held-to-maturity, amortized cost 66 85
Held-to-maturity, gross unrealized losses (10) (12)
Held-to-maturity, estimated fair value 56 73
Corporate Notes [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 17,772 17,817
Available-for-sale, gross unrealized gains   2
Available-for-sale, gross unrealized losses (3,091) (1,898)
Investment securities available-for-sale, at fair value 14,681 15,921
US Treasury Securities [Member]    
Schedule Of Investments [Line Items]    
Available-for-sale, amortized cost 56,988 56,956
Available-for-sale, gross unrealized losses (4,093) (4,074)
Investment securities available-for-sale, at fair value $ 52,895 $ 52,882