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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 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 June 30
 
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
$
253

 
$
1,806

 
$
2,059

 
$
30

 
$
4,846

 
$
4,876

Tax effect
—

 
(379
)
 
(379
)
 
—

 
(1,018
)
 
(1,018
)
Unrealized gains (losses), net of tax
$
253

 
$
1,427

 
$
1,680

 
$
30

 
$
3,828

 
$
3,858

 
Six Months Ended June 30
 
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
$
(140
)
 
$
8,510

 
$
8,370

 
$
295

 
$
10,535

 
$
10,830

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

 
(71
)
 
(71
)
 
—

 
—

 
—

Net unrealized gains (losses)
(140
)
 
8,439

 
8,299

 
295

 
10,535

 
10,830

Tax effect
—

 
(1,772
)
 
(1,772
)
 
—

 
(2,213
)
 
(2,213
)
Unrealized gains (losses), net of tax
$
(140
)
 
$
6,667

 
$
6,527

 
$
295


$
8,322


$
8,617

The following table summarizes the changes in AOCI by component for the:
 
Three Months Ended June 30
 
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, April 1
$
9,459

 
$
(54
)
 
$
(2,695
)
 
$
6,710

 
$
(441
)
 
$
192

 
$
(2,741
)
 
$
(2,990
)
OCI before reclassifications
2,059

 
(29
)
 
—

 
2,030

 
4,876

 
(127
)
 
—

 
4,749

Tax effect
(379
)
 
6

 
—

 
(373
)
 
(1,018
)
 
26

 
—

 
(992
)
OCI, net of tax
1,680

 
(23
)
 
—

 
1,657

 
3,858

 
(101
)
 
—

 
3,757

Balance,
June 30
$
11,139

 
$
(77
)
 
$
(2,695
)
 
$
8,367

 
$
3,417

 
$
91

 
$
(2,741
)
 
$
767

 
Six Months Ended June 30
 
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
8,370

 
(165
)
 
—

 
8,205

 
10,830

 
(208
)
 
—

 
10,622

Amounts reclassified from AOCI
(71
)
 
—

 
—

 
(71
)
 
—

 
—

 
—

 
—

Subtotal
8,299

 
(165
)
 
—

 
8,134

 
10,830

 
(208
)
 
—

 
10,622

Tax effect
(1,772
)
 
34

 
—

 
(1,738
)
 
(2,213
)
 
43

 
—

 
(2,170
)
OCI, net of tax
6,527

 
(131
)
 
—

 
6,396

 
8,617

 
(165
)

—


8,452

Balance,
June 30
$
11,139

 
$
(77
)
 
$
(2,695
)
 
$
8,367

 
$
3,417

 
$
91

 
$
(2,741
)
 
$
767