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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 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 September 30
20232022
Unrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		TotalUnrealized
Gains
(Losses) on
AFS
Securities		Defined
Benefit
Pension Plan		Total
Balance, July 1$(35,051)$(1,366)$(36,417)$(22,826)$(2,014)$(24,840)
OCI before reclassifications(6,708)— (6,708)(22,815)— (22,815)
Amounts reclassified from AOCI— — — — — — 
Subtotal(6,708)— (6,708)(22,815)— (22,815)
Tax effect1,394 — 1,394 4,788 — 4,788 
OCI, net of tax(5,314)— (5,314)(18,027)— (18,027)
Balance, September 30$(40,365)$(1,366)$(41,731)$(40,853)$(2,014)$(42,867)
Nine Months Ended September 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)$1,859 
OCI before reclassifications(5,736)— (5,736)(56,413)— (56,413)
Amounts reclassified from AOCI(67)— (67)— — — 
Subtotal(5,803)— (5,803)(56,413)— (56,413)
Tax effect1,266 — 1,266 11,687 — 11,687 
OCI, net of tax(4,537)— (4,537)(44,726)— (44,726)
Balance, September 30$(40,365)$(1,366)$(41,731)$(40,853)$(2,014)$(42,867)
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
Three Months Ended September 30
 20232022
Auction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotalAuction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotal
Unrealized gains (losses) arising during the period$(67)$(6,641)$(6,708)$(18)$(22,797)$(22,815)
Reclassification adjustment for net (gains) losses included in net income— — — — — — 
Net unrealized gains (losses)(67)(6,641)(6,708)(18)(22,797)(22,815)
Tax effect— 1,394 1,394 — 4,788 4,788 
Unrealized gains (losses), net of tax$(67)$(5,247)$(5,314)$(18)$(18,009)$(18,027)
 Nine Months Ended September 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$228 $(5,964)$(5,736)$(763)$(55,650)$(56,413)
Reclassification adjustment for net (gains) losses included in net income— (67)(67)— — — 
Net unrealized gains (losses)228 (6,031)(5,803)(763)(55,650)(56,413)
Tax effect— 1,266 1,266 — 11,687 11,687 
Unrealized gains (losses), net of tax$228 $(4,765)$(4,537)$(763)$(43,963)$(44,726)