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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
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 nine months ended September 30, 2017 and 2016, net of tax:
September 30, 2017

Unrealized Gains and Losses on Available-for-Sale Securities

Postretirement Benefit Items

Total










Beginning Balance at July 1, 2017

$
4,252


$
(92
)

$
4,160

Other Comprehensive Income (Loss) Before Reclassification

(937
)

—


(937
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

(374
)

—


(374
)
Net Current Period Other Comprehensive Income (Loss)

(1,311
)

—


(1,311
)
Ending Balance at September 30, 2017

$
2,941


$
(92
)

$
2,849

September 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

9,627


—


9,627

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)

(374
)

—


(374
)
Net Current Period Other Comprehensive Income (Loss)

9,253


—


9,253

Ending Balance at September 30, 2017

$
2,941


$
(92
)

$
2,849


September 30, 2016
 
Unrealized Gains and Losses on Available-for-Sale Securities
 
Postretirement Benefit Items
 
Total
 
 
 
 
 
 
 
Beginning Balance at July 1, 2016
 
$
11,273

 
$
(78
)
 
$
11,195

Other Comprehensive Income (Loss) Before Reclassification
 
1,228

 
—

 
1,228

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
(298
)
 
—

 
(298
)
Net Current Period Other Comprehensive Income (Loss)
 
930

 
—

 
930

Ending Balance at September 30, 2016
 
$
12,203

 
$
(78
)
 
$
12,125


September 30, 2016
 
Unrealized Gains and Losses on Available-for-Sale Securities
 
Postretirement Benefit Items
 
Total
 
 
 
 
 
 
 
Beginning Balance at January 1, 2016
 
$
3,890

 
$
(78
)
 
$
3,812

Other Comprehensive Income (Loss) Before Reclassification
 
9,240

 
—

 
9,240

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
(927
)
 
—

 
(927
)
Net Current Period Other Comprehensive Income (Loss)
 
8,313

 
—

 
8,313

Ending Balance at September 30, 2016
 
$
12,203

 
$
(78
)
 
$
12,125
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 nine months ended September 30, 2017 and 2016:
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

$
575


Net Gains on Securities


(201
)

Income Tax Expense
 

374


Net of Tax






Total Reclassifications for the Three Months Ended September 30, 2017

$
374


 
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

$
575


Net Gains on Securities
 

(201
)

Income Tax Expense
 

374


Net of Tax






Total Reclassifications for the Nine Months Ended September 30, 2017

$
374


 
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
 
$
458

 
Net Gains on Securities
 
 
(160
)
 
Income Tax Expense
 
 
298

 
Net of Tax
 
 
 
 
 
Total Reclassifications for the Three Months Ended September 30, 2016
 
$
298

 
 

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
 
$
1,426

 
Net Gains on Securities
 
 
(499
)
 
Income Tax Expense
 
 
927

 
Net of Tax
 
 
 
 
 
Total Reclassifications for the Nine Months Ended September 30, 2016
 
$
927