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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2018 and 2017, net of tax:
June 30, 2018

Unrealized Gains and Losses on Available-for-Sale Securities

Postretirement Benefit Items

Total










Beginning Balance at April 1, 2018

$
(11,553
)

$
(285
)

$
(11,838
)
Other Comprehensive Income (Loss) Before Reclassification

(1,443
)

—


(1,443
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

(58
)

—


(58
)
Net Current Period Other Comprehensive Income (Loss)

(1,501
)

—


(1,501
)
Ending Balance at June 30, 2018

$
(13,054
)

$
(285
)

$
(13,339
)

June 30, 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

(10,448
)

—


(10,448
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

(271
)

—


(271
)
Net Current Period Other Comprehensive Income (Loss)

(10,719
)

—


(10,719
)
Ending Balance at June 30, 2018

$
(13,054
)

$
(285
)

$
(13,339
)

June 30, 2017
 
Unrealized Gains and Losses on Available-for-Sale Securities
 
Postretirement Benefit Items
 
Total
 
 
 
 
 
 
 
Beginning Balance at April 1, 2017
 
$
(2,314
)
 
$
(92
)
 
$
(2,406
)
Other Comprehensive Income (Loss) Before Reclassification
 
6,566

 
—

 
6,566

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
—

 
—

 
—

Net Current Period Other Comprehensive Income (Loss)
 
6,566

 
—

 
6,566

Ending Balance at June 30, 2017
 
$
4,252

 
$
(92
)
 
$
4,160

June 30, 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
 
10,564

 
—

 
10,564

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
—

 
—

 
—

Net Current Period Other Comprehensive Income (Loss)
 
10,564

 
—

 
10,564

Ending Balance at June 30, 2017
 
$
4,252

 
$
(92
)
 
$
4,160
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 and six months ended June 30, 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

$
74


Net Gains on Securities


(16
)

Income Tax Expense
 

58


Net of Tax






Total Reclassifications for the Three Months Ended June 30, 2018

$
58


 

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

$
344


Net Gains on Securities
 

(73
)

Income Tax Expense
 

271


Net of Tax






Total Reclassifications for the Six Months Ended June 30, 2018

$
271


 

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 June 30, 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
 
$
—

 
Net Gains on Securities
 
 
—

 
Income Tax Expense
 
 
—

 
Net of Tax
 
 
 
 
 
Total Reclassifications for the Six Months Ended June 30, 2017
 
$
—