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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Summary of the components of accumulated other comprehensive income
A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the:
 
Three Months Ended March 31
 
2018
 
2017

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
$
(37
)
 
$
(8,020
)
 
$
(8,057
)
 
$
355

 
$
1,322

 
$
1,677

Tax effect
—

 
1,684

 
1,684

 
—

 
(450
)
 
(450
)
Unrealized gains (losses), net of tax
$
(37
)
 
$
(6,336
)
 
$
(6,373
)
 
$
355

 
$
872

 
$
1,227

The following table summarizes the changes in AOCI by component for the:
 
Three Months Ended March 31
 
2018
 
2017

Unrealized
Holding Gains
(Losses) on
AFS
Securities
 
Unrealized
Gains
(Losses) on Derivative Instruments
 
Defined
Benefit
Pension Plan
 
Total
 
Unrealized
Holding Gains
(Losses) on
AFS
Securities
 
Unrealized
Gains
(Losses) on Derivative Instruments
 
Defined
Benefit
Pension Plan
 
Total
Balance, January 1
$
391

 
$
230

 
$
(3,223
)
 
$
(2,602
)
 
$
30

 
$
164

 
$
(2,972
)
 
$
(2,778
)
OCI before reclassifications
(8,057
)
 
122

 
—

 
(7,935
)
 
1,677

 
17

 
—

 
1,694

Tax effect
1,684

 
(26
)
 
—

 
1,658

 
(450
)
 
(6
)
 
—

 
(456
)
OCI, net of tax
(6,373
)
 
96

 
—

 
(6,277
)
 
1,227

 
11

 
—

 
1,238

Adoption of ASU 2016-01
223

 
—

 
—

 
223

 
—

 
—

 
—

 
—

Balance, March 31
$
(5,759
)
 
$
326

 
$
(3,223
)
 
$
(8,656
)
 
$
1,257

 
$
175

 
$
(2,972
)
 
$
(1,540
)