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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2019
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
 
2019
 
2018

Auction Rate Money Market Preferred Stocks
 
All Other AFS Securities
 
Total
 
Auction Rate Money Market Preferred and Preferred Stocks
 
All Other AFS Securities
 
Total
Unrealized gains (losses) arising during the period
$
30

 
$
4,846

 
$
4,876

 
$
123

 
$
(2,101
)
 
$
(1,978
)
Tax effect
—

 
(1,018
)
 
(1,018
)
 
—

 
442

 
442

Unrealized gains (losses), net of tax
$
30

 
$
3,828

 
$
3,858

 
$
123

 
$
(1,659
)
 
$
(1,536
)
 
Six Months Ended June 30
 
2019
 
2018

Auction Rate Money Market Preferred Stocks
 
All Other AFS Securities
 
Total
 
Auction Rate Money Market Preferred and Preferred Stocks
 
All Other AFS Securities
 
Total
Unrealized gains (losses) arising during the period
$
295

 
$
10,535

 
$
10,830

 
$
86

 
$
(10,121
)
 
$
(10,035
)
Tax effect
—

 
(2,213
)
 
(2,213
)
 
—

 
2,126

 
2,126

Unrealized gains (losses), net of tax
$
295

 
$
8,322

 
$
8,617

 
$
86


$
(7,995
)

$
(7,909
)
The following table summarizes the changes in AOCI by component for the:
 
Three Months Ended June 30
 
2019
 
2018

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
$
(441
)
 
$
192

 
$
(2,741
)
 
$
(2,990
)
 
$
(5,759
)
 
$
326

 
$
(3,223
)
 
$
(8,656
)
OCI before reclassifications
4,876

 
(127
)
 
—

 
4,749

 
(1,978
)
 
31

 
—

 
(1,947
)
Tax effect
(1,018
)
 
26

 
—

 
(992
)
 
442

 
(6
)
 
—

 
436

OCI, net of tax
3,858

 
(101
)
 
—

 
3,757

 
(1,536
)
 
25

 
—

 
(1,511
)
Balance,
June 30
$
3,417

 
$
91

 
$
(2,741
)
 
$
767

 
$
(7,295
)
 
$
351

 
$
(3,223
)
 
$
(10,167
)
 
Six Months Ended June 30
 
2019
 
2018

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
$
(5,200
)
 
$
256

 
$
(2,741
)
 
$
(7,685
)
 
$
391

 
$
230

 
$
(3,223
)
 
$
(2,602
)
OCI before reclassifications
10,830

 
(208
)
 
—

 
10,622

 
(10,035
)
 
153

 
—

 
(9,882
)
Tax effect
(2,213
)
 
43

 
—

 
(2,170
)
 
2,126

 
(32
)
 
—

 
2,094

OCI, net of tax
8,617

 
(165
)
 
—

 
8,452

 
(7,909
)

121


—


(7,788
)
Adoption of ASU 2016-01
—

 
—

 
—

 
—

 
223

 
—

 
—

 
223

Balance,
June 30
$
3,417

 
$
91

 
$
(2,741
)
 
$
767

 
$
(7,295
)
 
$
351

 
$
(3,223
)
 
$
(10,167
)