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Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Available-for-Sale Securities:      
Amortized Cost $ 142,754 $ 151,943  
Gross Unrealized Losses (26,001) (22,438)  
Fair Value 116,753 129,505  
Held-to-Maturity Securities:      
Amortized Cost   510,820  
Amortized Cost, Allowance for Credit Losstes (647) 0 $ 0
Amortized Cost, after Allowance for Credit Loss 471,065    
Gross Unrealized Gains 147 283  
Gross Unrealized Losses (26,995) (15,252)  
Fair Value 444,864 495,851  
US Agency Bonds      
Held-to-Maturity Securities:      
Amortized Cost 25,000 35,000  
Gross Unrealized Losses (504) (380)  
Fair Value 24,496 34,620  
U.S. Government Bonds      
Available-for-Sale Securities:      
Amortized Cost 2,989 2,985  
Gross Unrealized Losses (276) (296)  
Fair Value 2,713 2,689  
Corporate Bonds      
Available-for-Sale Securities:      
Amortized Cost 25,799 25,824  
Gross Unrealized Losses (2,609) (2,465)  
Fair Value 23,190 23,359  
Held-to-Maturity Securities:      
Amortized Cost 82,500 82,500  
Gross Unrealized Gains   57  
Gross Unrealized Losses (5,117) (3,819)  
Fair Value 77,383 78,738  
Collateralized Mortgage Obligations      
Available-for-Sale Securities:      
Amortized Cost 40,646 [1] 44,503 [2]  
Gross Unrealized Losses (7,657) [1] (6,726) [2]  
Fair Value 32,989 [1] 37,777 [2]  
Held-to-Maturity Securities:      
Amortized Cost 217,632 [1] 235,479 [2]  
Gross Unrealized Gains [2]   192  
Gross Unrealized Losses (12,198) [1] (5,558) [2]  
Fair Value 205,434 [1] 230,113 [2]  
FHLMC Certificates      
Available-for-Sale Securities:      
Amortized Cost 10,441 11,310  
Gross Unrealized Losses (1,904) (1,676)  
Fair Value 8,537 9,634  
Held-to-Maturity Securities:      
Amortized Cost 3,923 4,120  
Gross Unrealized Losses (358) (268)  
Fair Value 3,565 3,852  
FNMA Certificates      
Available-for-Sale Securities:      
Amortized Cost 62,771 67,199  
Gross Unrealized Losses (13,552) (11,271)  
Fair Value 49,219 55,928  
Held-to-Maturity Securities:      
Amortized Cost 121,940 131,918  
Gross Unrealized Losses (8,818) (5,227)  
Fair Value 113,122 126,691  
GNMA Certificates      
Available-for-Sale Securities:      
Amortized Cost 108 122  
Gross Unrealized Losses (3) (4)  
Fair Value 105 118  
SBA Certificates      
Held-to-Maturity Securities:      
Amortized Cost 20,717 21,803  
Gross Unrealized Gains 147 34  
Fair Value $ 20,864 $ 21,837  
[1] Comprised of Federal Home Loan Mortgage Corporation (“FHLMC”), Federal National Mortgage Association (“FNMA”) and Ginnie Mae (“GNMA”) issued securities.
[2] Comprised of FHLMC, FNMA and GNMA issued securities.