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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Summary of the components of accumulated other comprehensive income
The following table summarizes the changes in AOCI by component for the:
Three Months Ended March 31
20242023
Unrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		TotalUnrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		Total
Balance, January 1$(25,199)$(697)$(25,896)$(35,828)$(1,366)$(37,194)
OCI before reclassifications(2,926)— (2,926)8,610 — 8,610 
Amounts reclassified from AOCI— — — (1)— (1)
Subtotal(2,926)— (2,926)8,609 — 8,609 
Tax effect632 — 632 (1,729)— (1,729)
OCI, net of tax(2,294)— (2,294)6,880 — 6,880 
Balance, March 31$(27,493)$(697)$(28,190)$(28,948)$(1,366)$(30,314)
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
 Three Months Ended March 31
 20242023
Auction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotalAuction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotal
Unrealized gains (losses) arising during the period$82 $(3,008)$(2,926)$374 $8,236 $8,610 
Reclassification adjustment for net (gains) losses included in net income— — — — (1)(1)
Net unrealized gains (losses)82 (3,008)(2,926)374 8,235 8,609 
Tax effect— 632 632 — (1,729)(1,729)
Unrealized gains (losses), net of tax$82 $(2,376)$(2,294)$374 $6,506 $6,880