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Investment Securities - Debt Securities, Held-to-Maturity, Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Allowance for credit losses:    
Beginning balance $ 434 $ 0
Credit loss (reduction) expense (238) (4)
Securities charged-off 0 0
Recoveries 0 0
Total ending allowance balance 196 434
Adoption of ASU No. 2016-13    
Allowance for credit losses:    
Beginning balance 0 438
Total ending allowance balance   0
State and political subdivisions    
Allowance for credit losses:    
Beginning balance 212 0
Credit loss (reduction) expense (132) 3
Securities charged-off 0 0
Recoveries 0 0
Total ending allowance balance 80 212
State and political subdivisions | Adoption of ASU No. 2016-13    
Allowance for credit losses:    
Beginning balance 0 209
Total ending allowance balance   0
Corporate securities    
Allowance for credit losses:    
Beginning balance 222 0
Credit loss (reduction) expense (106) (7)
Securities charged-off 0 0
Recoveries 0 0
Total ending allowance balance 116 222
Corporate securities | Adoption of ASU No. 2016-13    
Allowance for credit losses:    
Beginning balance $ 0 229
Total ending allowance balance   $ 0