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Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The tables below summarize the changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2018 and 2017, net of tax:
March 31, 2018

Unrealized Gains and Losses on Available-for-Sale Securities

Postretirement Benefit Items

Total










Beginning Balance at January 1, 2018

$
(2,335
)

$
(285
)

$
(2,620
)
Other Comprehensive Income (Loss) Before Reclassification

(9,005
)

—


(9,005
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

(213
)

—


(213
)
Net Current Period Other Comprehensive Income (Loss)

(9,218
)

—


(9,218
)
Ending Balance at March 31, 2018

$
(11,553
)

$
(285
)

$
(11,838
)
 
 
 
 
 
 
 
March 31, 2017
 
Unrealized Gains and Losses on Available-for-Sale Securities
 
Postretirement Benefit Items
 
Total
 
 
 
 
 
 
 
Beginning Balance at January 1, 2017
 
$
(6,312
)
 
$
(92
)
 
$
(6,404
)
Other Comprehensive Income (Loss) Before Reclassification
 
3,998

 
—

 
3,998

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
—

 
—

 
—

Net Current Period Other Comprehensive Income (Loss)
 
3,998

 
—

 
3,998

Ending Balance at March 31, 2017
 
$
(2,314
)
 
$
(92
)
 
$
(2,406
)
 
 
 
 
 
 
 
Schedule of Classifications Out of Accumulated Other Comprehensive Income (Loss)
The tables below summarize the classifications out of accumulated other comprehensive income (loss) by component for the three months ended March 31, 2018 and 2017:
Details about Accumulated Other Comprehensive Income (Loss) Components

Amount Reclassified From Accumulated Other Comprehensive Income (Loss)

Affected Line Item in the Statement Where Net Income is Presented






Unrealized Gains and Losses on Available-for-Sale Securities

$
270


Net Gains on Securities


(57
)

Income Tax Expense
 

213


Net of Tax






Total Reclassifications for the Three Months Ended March 31, 2018

$
213


 
Details about Accumulated Other Comprehensive Income (Loss) Components

Amount Reclassified From Accumulated Other Comprehensive Income (Loss)

Affected Line Item in the Statement Where Net Income is Presented






Unrealized Gains and Losses on Available-for-Sale Securities

$
—


Net Gains on Securities
 

—


Income Tax Expense
 

—


Net of Tax






Total Reclassifications for the Three Months Ended March 31, 2017

$
—