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Marketable Securities - Issuers and the Carrying Values of Mortgage-Backed Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Marketable Securities      
Carrying value $ 241,500    
Proceeds from sale of marketable securities available-for-sale 0 $ 59,579 $ 1,096
Realized gains   410 64
Realized losses   396 $ 0
Amounts recognized in allowance for credit losses for marketable securities 0 0  
Residential mortgage-backed securities      
Marketable Securities      
Total residential mortgage-backed securities 1,750,365 1,941,618  
FNMA      
Marketable Securities      
Total residential mortgage-backed securities 651,404 704,070  
GNMA      
Marketable Securities      
Total residential mortgage-backed securities 438,193 577,684  
FHLMC      
Marketable Securities      
Total residential mortgage-backed securities 660,762 659,433  
Other (including non-agency)      
Marketable Securities      
Total residential mortgage-backed securities $ 6 $ 431