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Accumulated Other Comprehensive Income (Loss) (Components of unrealized holding gains on AFS securities) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax $ 5,014 $ (2,926)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 5,014 (2,926)
Tax effect [1] (1,098) 632
Other Comprehensive Income (Loss), Net of Tax 3,916 (2,294)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax 3,916 (2,294)
All Other AFS Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 5,229 (3,008)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 5,229 (3,008)
Tax effect (1,098) 632
Other Comprehensive Income (Loss), Net of Tax 4,131 (2,376)
Auction Rate Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (215) 82
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax (215) 82
Tax effect 0 0
Other Comprehensive Income (Loss), Net of Tax $ (215) $ 82
[1] See “Note 6 – Capital Ratios and Shareholders' Equity” for tax effect reconciliation.