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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule Of Changes In Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax
The following tables provide changes in the balances of each component of accumulated other comprehensive income, net of tax, for the periods ended December 31, 2017, 2016 and 2015:
2017
Unrealized Gains and Losses
On Available-for-Sale
Securities
 
Postretirement
Benefits Plans
 
 
Total
Beginning balance at January 1
$
11,870,647

 
$
(109,200
)
 
$
11,761,447

Other comprehensive income before reclassifications
4,922,796

 
45,958

 
4,968,754

Amounts reclassified from accumulated other comprehensive income
(791,061
)
 
5,686

 
(785,375
)
Net current-period other comprehensive income
4,131,735

 
51,644

 
4,183,379

Ending balance
$
16,002,382

 
$
(57,556
)
 
$
15,944,826

2016
Unrealized Gains and Losses
On Available-for-Sale
Securities
 
Postretirement
Benefits Plans
 
 
Total
Beginning balance at January 1
$
11,597,741

 
$
(114,726
)
 
$
11,483,015

Other comprehensive income (loss) before reclassifications
758,021

 
(374
)
 
757,647

Amounts reclassified from accumulated other comprehensive income
(485,115
)
 
5,900

 
(479,215
)
Net current-period other comprehensive income
272,906

 
5,526

 
278,432

Ending balance
$
11,870,647

 
$
(109,200
)
 
$
11,761,447

2015
Unrealized Gains and Losses
On Available-for-Sale
Securities
 
Postretirement
Benefits Plans
 
 
Total
Beginning balance at January 1
$
12,934,497

 
$
(77,988
)
 
$
12,856,509

Other comprehensive loss before reclassifications
(1,355,316
)
 
(41,954
)
 
(1,397,270
)
Amounts reclassified from accumulated other comprehensive income
18,560

 
5,216

 
23,776

Net current-period other comprehensive loss
(1,336,756
)
 
(36,738
)
 
(1,373,494
)
Ending balance
$
11,597,741

 
$
(114,726
)
 
$
11,483,015
Schedule Of Reclassification Out Of Accumulated Other Comprehensive Income
The following tables provide significant amounts reclassified out of each component of accumulated other comprehensive income for the periods ended December 31, 2017, 2016 and 2015:
2017
 

 
Details about Accumulated Other
Comprehensive Income Components
Amount Reclassified from
Accumulated Other
Comprehensive Income

 Affected Line Item in the Consolidated
Statements of Income
Unrealized gains and losses on available-for-sale securities:
 

 
Net realized gain on investment
$
1,227,265


 
Other-than-temporary impairments
(25,411
)

 
Total
$
1,201,854


Net realized gain (loss) on investments
Tax
(410,793
)

Provision for Income Taxes
Net of Tax
$
791,061


 
Amortization related to postretirement benefit plans:
 


 
Prior year service cost
$
—


 
Unrecognized loss
(8,612
)

 
Total
$
(8,612
)

(a)
Tax
2,926


Provision for Income Taxes
Net of Tax
$
(5,686
)

 
Reclassifications for the period
$
785,375


 
2016
 
 
 
Details about Accumulated Other
Comprehensive Income Components
Amount Reclassified from
Accumulated Other
Comprehensive Income
 
 Affected Line Item in the Consolidated
Statements of Income
Unrealized gains and losses on available-for-sale securities:
 
 
 
Net realized gain on investment
$
972,672

 
 
Other-than-temporary impairments
(233,941
)
 
 
Total
$
738,731

 
Net realized gain (loss) on investments
Tax
(253,616
)
 
Provision for Income Taxes
Net of Tax
$
485,115

 
 
Amortization related to postretirement benefit plans:
 

 
 
Prior year service cost
$
—

 
 
Unrecognized loss
(8,941
)
 
 
Total
$
(8,941
)
 
(a)
Tax
3,041

 
Provision for Income Taxes
Net of Tax
$
(5,900
)
 
 
Reclassifications for the period
$
479,215

 
 
2015
 
 
 
Details about Accumulated Other
Comprehensive Income Components
Amount Reclassified from
Accumulated Other
Comprehensive Income
 
 Affected Line Item in the Consolidated
Statements of Income
Unrealized gains and losses on available-for-sale securities:
 
 
 
Net realized gain on investment
$
718,837

 
 
Other-than-temporary impairments
(751,059
)
 
 
Total
$
(32,222
)
 
Net realized gain (loss) on investments
Tax
13,662

 
Provision for Income Taxes
Net of Tax
$
(18,560
)
 
 
Amortization related to postretirement benefit plans:
 

 
 
Prior year service cost
$
(4,390
)
 
 
Unrecognized loss
(3,514
)
 
 
Total
$
(7,904
)
 
(a)
Tax
2,688

 
Provision for Income Taxes
Net of Tax
$
(5,216
)
 
 
Reclassifications for the period
$
(23,776
)
 
 

(a)
These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within salaries, employee benefits and payroll taxes on the Consolidated Statements of Income as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 10.