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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Component of Other Comprehensive Income (Loss)
The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. Reclassification adjustments related to defined-benefit post-retirement benefit plans are included in the computation of net periodic pension expense (see Note 12 – Defined Benefit Plans).
 
Three Months Ended 
 September 30, 2019
 
Three Months Ended 
 September 30, 2018
 
Before Tax
Amount
 
Tax  Expense,
(Benefit)
 
Net of  Tax
Amount
 
Before Tax
Amount
 
Tax  Expense,
(Benefit)
 
Net of  Tax
Amount
Securities available for sale and transferred securities:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
107,786

 
$
22,635

 
$
85,151

 
$
(96,147
)
 
$
(20,190
)
 
$
(75,957
)
Change in net unrealized gain on securities transferred to held to maturity
(305
)
 
(64
)
 
(241
)
 
(3,764
)
 
(790
)
 
(2,974
)
Reclassification adjustment for net (gains) losses included in net income
(97
)
 
(21
)
 
(76
)
 
34

 
7

 
27

Total securities available for sale and transferred securities
107,384

 
22,550

 
84,834

 
(99,877
)
 
(20,973
)
 
(78,904
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
1,406

 
295

 
1,111

 
1,250

 
262

 
988

Total defined-benefit post-retirement benefit plans
1,406

 
295

 
1,111

 
1,250

 
262

 
988

Total other comprehensive income (loss)
$
108,790

 
$
22,845

 
$
85,945

 
$
(98,627
)
 
$
(20,711
)
 
$
(77,916
)
 
Nine Months Ended 
 September 30, 2019
 
Nine Months Ended 
 September 30, 2018
 
Before Tax
Amount
 
Tax  Expense,
(Benefit)
 
Net of  Tax
Amount
 
Before Tax
Amount
 
Tax  Expense,
(Benefit)
 
Net of  Tax
Amount
Securities available for sale and transferred securities:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
464,072

 
$
97,455

 
$
366,617

 
$
(286,935
)
 
$
(60,256
)
 
$
(226,679
)
Change in net unrealized gain on securities transferred to held to maturity
(957
)
 
(201
)
 
(756
)
 
(8,424
)
 
(1,769
)
 
(6,655
)
Reclassification adjustment for net (gains) losses included in net income
(266
)
 
(56
)
 
(210
)
 
113

 
24

 
89

Total securities available for sale and transferred securities
462,849

 
97,198

 
365,651

 
(295,246
)
 
(62,001
)
 
(233,245
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
4,218

 
886

 
3,332

 
3,751

 
788

 
2,963

Total defined-benefit post-retirement benefit plans
4,218

 
886

 
3,332

 
3,751

 
788

 
2,963

Total other comprehensive income (loss)
$
467,067

 
$
98,084

 
$
368,983

 
$
(291,495
)
 
$
(61,213
)
 
$
(230,282
)
Schedule of Accumulated Other Comprehensive Income, Net of Tax
Activity in accumulated other comprehensive income (loss), 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 reclassifications
365,861

 
—

 
365,861

Reclassification of amounts included in net income
(210
)
 
3,332

 
3,122

Net other comprehensive income (loss) during period
365,651

 
3,332

 
368,983

Balance at September 30, 2019
$
349,548

 
$
(44,165
)
 
$
305,383

 
 
 
 
 
 
Balance January 1, 2018
$
117,230

 
$
(37,718
)
 
$
79,512

Other comprehensive income (loss) before reclassifications
(233,334
)
 
—

 
(233,334
)
Reclassification of amounts included in net income
89

 
2,963

 
3,052

Net other comprehensive income (loss) during period
(233,245
)
 
2,963

 
(230,282
)
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 at September 30, 2018
$
(98,458
)
 
$
(42,777
)
 
$
(141,235
)