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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Summary of the components of accumulated other comprehensive income
A summary of the components of unrealized gains on AFS securities included in OCI follows for the:
 
Three Months Ended March 31
 
2020
 
2019

Auction Rate Money Market Preferred Stocks
 
All Other AFS Securities
 
Total
 
Auction Rate Money Market Preferred Stocks
 
All Other AFS Securities
 
Total
Unrealized gains (losses) arising during the period
$
(393
)
 
$
6,704

 
$
6,311

 
$
265

 
$
5,689

 
$
5,954

Reclassification adjustment for net (gains) losses included in net income
—

 
(71
)
 
(71
)
 
—

 
—

 
—

Net unrealized gains (losses)
(393
)
 
6,633

 
6,240

 
265

 
5,689

 
5,954

Tax effect
—

 
(1,393
)
 
(1,393
)
 
—

 
(1,195
)
 
(1,195
)
Unrealized gains (losses), net of tax
$
(393
)
 
$
5,240

 
$
4,847

 
$
265


$
4,494


$
4,759

The following table summarizes the changes in AOCI by component for the:
 
Three Months Ended March 31
 
2020
 
2019

Unrealized
Gains
(Losses) on
AFS
Securities
 
Unrealized
Gains
(Losses) on Derivative Instruments
 
Defined
Benefit
Pension Plan
 
Total
 
Unrealized
Gains
(Losses) on
AFS
Securities
 
Unrealized
Gains
(Losses) on Derivative Instruments
 
Defined
Benefit
Pension Plan
 
Total
Balance, January 1
$
4,612

 
$
54

 
$
(2,695
)
 
$
1,971

 
$
(5,200
)
 
$
256

 
$
(2,741
)
 
$
(7,685
)
OCI before reclassifications
6,311

 
(136
)
 
—

 
6,175

 
5,954

 
(81
)
 
—

 
5,873

Amounts reclassified from AOCI
(71
)
 
—

 
—

 
(71
)
 
—

 
—

 
—

 
—

Subtotal
6,240

 
(136
)
 
—

 
6,104

 
5,954

 
(81
)
 
—

 
5,873

Tax effect
(1,393
)
 
28

 
—

 
(1,365
)
 
(1,195
)
 
17

 
—

 
(1,178
)
OCI, net of tax
4,847

 
(108
)
 
—

 
4,739

 
4,759


(64
)

—


4,695

Balance,
March 31
$
9,459

 
$
(54
)
 
$
(2,695
)
 
$
6,710

 
$
(441
)
 
$
192

 
$
(2,741
)
 
$
(2,990
)