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Securities - Schedule of Held to Maturity Securities - Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
contract
Dec. 31, 2022
USD ($)
contract
Number of Securities    
Less than 12 months, number of securities | contract 1 31
12 months or more, number of securities | contract 46 15
Estimated Fair Value    
less than 12 months $ 9,425 $ 142,033
12 months or more 185,740 65,444
Total 195,165 207,477
Unrealized Loss    
Less than 12 months (500) (9,085)
12 months or more (34,589) (15,516)
Total $ (35,089) $ (24,601)
U.S. government agency debt securities    
Number of Securities    
Less than 12 months, number of securities | contract 1 0
12 months or more, number of securities | contract 12 12
Estimated Fair Value    
less than 12 months $ 9,425 $ 0
12 months or more 45,239 50,755
Total 54,664 50,755
Unrealized Loss    
Less than 12 months (500) 0
12 months or more (9,838) (7,778)
Total $ (10,338) $ (7,778)
U.S. government-sponsored enterprise debt securities    
Number of Securities    
Less than 12 months, number of securities | contract 0 31
12 months or more, number of securities | contract 34 3
Estimated Fair Value    
less than 12 months $ 0 $ 142,033
12 months or more 140,501 14,689
Total 140,501 156,722
Unrealized Loss    
Less than 12 months 0 (9,085)
12 months or more (24,751) (7,738)
Total $ (24,751) $ (16,823)