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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Other Comprehensive Income (Loss) Other Comprehensive Income (Loss)
The tax effects allocated to each component of other comprehensive income (loss) were as follows:
 
Before Tax
Amount
 
Tax Expense,
(Benefit)
 
Net of Tax
Amount
2019
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
418,556

 
$
87,897

 
$
330,659

Change in net unrealized gain on securities transferred to held to maturity
(1,292
)
 
(271
)
 
(1,021
)
Reclassification adjustment for net (gains) losses included in net income
(293
)
 
(62
)
 
(231
)
Total securities available for sale and transferred securities
416,971

 
87,564

 
329,407

Defined-benefit post-retirement benefit plans:
 
 
 
 
 
Change in the net actuarial gain/loss
(3,644
)
 
(765
)
 
(2,879
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
5,623

 
1,181

 
4,442

Total defined-benefit post-retirement benefit plans
1,979

 
416

 
1,563

Total other comprehensive income (loss)
$
418,950

 
$
87,980

 
$
330,970

 
 
 
 
 
 
2018
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
(182,340
)
 
$
(38,292
)
 
$
(144,048
)
Change in net unrealized gain on securities transferred to held to maturity
(8,818
)
 
(1,853
)
 
(6,965
)
Reclassification adjustment for net (gains) losses included in net income
156

 
33

 
123

Total securities available for sale and transferred securities
(191,002
)
 
(40,112
)
 
(150,890
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
Change in the net actuarial gain/loss
(7,225
)
 
(1,517
)
 
(5,708
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
5,002

 
1,051

 
3,951

Total defined-benefit post-retirement benefit plans
(2,223
)
 
(466
)
 
(1,757
)
Total other comprehensive income (loss)
$
(193,225
)
 
$
(40,578
)
 
$
(152,647
)
 
 
 
 
 
 
2017
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
157,016

 
$
48,626

 
$
108,390

Change in net unrealized gain on securities transferred to held to maturity
(16,193
)
 
(5,668
)
 
(10,525
)
Reclassification adjustment for net (gains) losses included in net income
4,941

 
1,729

 
3,212

Total securities available for sale and transferred securities
145,764

 
44,687

 
101,077

Defined-benefit post-retirement benefit plans:
 
 

 

Change in the net actuarial gain/loss
(597
)
 
(126
)
 
(471
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
5,429

 
1,900

 
3,529

Total defined-benefit post-retirement benefit plans
4,832

 
1,774

 
3,058

Total other comprehensive income (loss)
$
150,596

 
$
46,461

 
$
104,135

Activity in accumulated other comprehensive income, net of tax, was as follows:
 
Securities
Available
For Sale
 
Defined
Benefit
Plans
 
Accumulated
Other
Comprehensive
Income
Balance January 1, 2019
$
(16,103
)
 
$
(47,497
)
 
$
(63,600
)
Other comprehensive income (loss) before reclassification
329,638

 
(2,879
)
 
326,759

Reclassification of amounts included in net income
(231
)
 
4,442

 
4,211

Net other comprehensive income (loss) during period
329,407

 
1,563

 
330,970

Balance December 31, 2019
$
313,304

 
$
(45,934
)
 
$
267,370

 
 
 
 
 
 
Balance January 1, 2018
$
117,230

 
$
(37,718
)
 
$
79,512

Other comprehensive income (loss) before reclassification
(151,013
)
 
(5,708
)
 
(156,721
)
Reclassification of amounts included in net income
123

 
3,951

 
4,074

Net other comprehensive income (loss) during period
(150,890
)
 
(1,757
)
 
(152,647
)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act to retained earnings
17,557

 
(8,022
)
 
9,535

Balance December 31, 2018
$
(16,103
)
 
$
(47,497
)
 
$
(63,600
)
 
 
 
 
 
 
Balance January 1, 2017
$
16,153

 
$
(40,776
)
 
$
(24,623
)
Other comprehensive income (loss) before reclassification
97,865

 
(471
)
 
97,394

Reclassification of amounts included in net income
3,212

 
3,529

 
6,741

Net other comprehensive income (loss) during period
101,077

 
3,058

 
104,135

Balance December 31, 2017
$
117,230

 
$
(37,718
)
 
$
79,512