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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2018
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
 
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
)

Included in OCI for the three month period ended March 31, 2018 are changes in unrealized holding gains and losses related to auction rate money market preferred stocks. For the three month period ended March 31, 2017, OCI also includes changes in unrealized holding gains and losses related to preferred stocks. For federal income tax purposes, these securities are considered equity investments. As such, no deferred federal income taxes related to unrealized holding gains or losses are expected or recorded.
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