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Investment Securities - Debt Securities, Held-to-Maturity, Allowance for Credit Loss (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Allowance for credit losses:  
Beginning balance $ 0
Credit loss (reversal) provision (4,000)
Securities charged-off 0
Recoveries 0
Total ending allowance balance 434,000 [1]
Impact of ASC 326 Adoption  
Allowance for credit losses:  
Beginning balance 438,000
State and political subdivisions  
Allowance for credit losses:  
Beginning balance 0
Credit loss (reversal) provision (7,000)
Securities charged-off 0
Recoveries 0
Total ending allowance balance 222,000
State and political subdivisions | Impact of ASC 326 Adoption  
Allowance for credit losses:  
Beginning balance 229,000
Corporate securities  
Allowance for credit losses:  
Beginning balance 0
Credit loss (reversal) provision 3,000
Securities charged-off 0
Recoveries 0
Total ending allowance balance 212,000
Corporate securities | Impact of ASC 326 Adoption  
Allowance for credit losses:  
Beginning balance $ 209,000
[1] December 31, 2022 had no ACL on HTM securities.