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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income
The following table summarizes the changes in AOCI by component for the:
Three Months Ended March 31
20212020
Unrealized
Gains
(Losses) on
AFS
Securities		Unrealized
Gains
(Losses) on Derivative Instruments		Defined
Benefit
Pension Plan		TotalUnrealized
Gains
(Losses) on
AFS
Securities		Unrealized
Gains
(Losses) on Derivative Instruments		Defined
Benefit
Pension Plan		Total
Balance, January 1$10,485 $(42)$(2,745)$7,698 $4,612 $54 $(2,695)$1,971 
OCI before reclassifications(3,545)26 — (3,519)6,311 (136)— 6,175 
Amounts reclassified from AOCI— — — — (71)— — (71)
Subtotal(3,545)26 — (3,519)6,240 (136)— 6,104 
Tax effect742 (5)— 737 (1,393)28 — (1,365)
OCI, net of tax(2,803)21 — (2,782)4,847 (108)— 4,739 
Balance, March 31$7,682 $(21)$(2,745)$4,916 $9,459 $(54)$(2,695)$6,710 
Included in OCI for the three-month periods ended March 31, 2021 and 2020 are changes in unrealized gains and losses related to auction rate money market preferred stocks. These investments, for federal income tax purposes, have no deferred federal income taxes related to unrealized gains or losses given the nature of the investments.
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
 Three Months Ended March 31
 20212020
Auction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotalAuction Rate Money Market Preferred StocksAll Other AFS SecuritiesTotal
Unrealized gains (losses) arising during the period$(13)$(3,532)$(3,545)$(393)$6,704 $6,311 
Reclassification adjustment for net (gains) losses included in net income— — — — (71)(71)
Net unrealized gains (losses)(13)(3,532)(3,545)(393)6,633 6,240 
Tax effect— 742 742 — (1,393)(1,393)
Unrealized gains (losses), net of tax$(13)$(2,790)$(2,803)$(393)$5,240 $4,847