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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2023
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 June 30
20232022
Unrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		TotalUnrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		Total
Balance, April 1$(28,948)$(1,366)$(30,314)$(14,319)$(2,014)$(16,333)
OCI before reclassifications(7,638)— (7,638)(10,670)— (10,670)
Amounts reclassified from AOCI(66)— (66)— — — 
Subtotal(7,704)— (7,704)(10,670)— (10,670)
Tax effect1,601 — 1,601 2,163 — 2,163 
OCI, net of tax(6,103)— (6,103)(8,507)— (8,507)
Balance, June 30$(35,051)$(1,366)$(36,417)$(22,826)$(2,014)$(24,840)
Six Months Ended June 30
20232022
Unrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		TotalUnrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		Total
Balance, January 1$(35,828)$(1,366)$(37,194)$3,873 $(2,014)$1,859 
OCI before reclassifications972 — 972 (33,598)— (33,598)
Amounts reclassified from AOCI(67)— (67)— — — 
Subtotal905 — 905 (33,598)— (33,598)
Tax effect(128)— (128)6,899 — 6,899 
OCI, net of tax777 — 777 (26,699)— (26,699)
Balance, June 30$(35,051)$(1,366)$(36,417)$(22,826)$(2,014)$(24,840)
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
Three Months Ended June 30
 20232022
Auction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotalAuction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotal
Unrealized gains (losses) arising during the period$(79)$(7,559)$(7,638)$(370)$(10,300)$(10,670)
Reclassification adjustment for net (gains) losses included in net income— (66)(66)— — — 
Net unrealized gains (losses)(79)(7,625)(7,704)(370)(10,300)(10,670)
Tax effect— 1,601 1,601 — 2,163 2,163 
Unrealized gains (losses), net of tax$(79)$(6,024)$(6,103)$(370)$(8,137)$(8,507)
 Six Months Ended June 30
 20232022
Auction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotalAuction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotal
Unrealized gains (losses) arising during the period$295 $677 $972 $(745)$(32,853)$(33,598)
Reclassification adjustment for net (gains) losses included in net income— (67)(67)— — — 
Net unrealized gains (losses)295 610 905 (745)(32,853)(33,598)
Tax effect— (128)(128)— 6,899 6,899 
Unrealized gains (losses), net of tax$295 $482 $777 $(745)$(25,954)$(26,699)