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Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Other Comprehensive Income (Loss) 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 
 June 30, 2019
 
Three Months Ended 
 June 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
$
158,140

 
$
33,209

 
$
124,931

 
$
(11,884
)
 
$
(2,496
)
 
$
(9,388
)
Change in net unrealized gain on securities transferred to held to maturity
(308
)
 
(65
)
 
(243
)
 
(2,041
)
 
(429
)
 
(1,612
)
Reclassification adjustment for net (gains) losses included in net income
(169
)
 
(35
)
 
(134
)
 
60

 
13

 
47

Total securities available for sale and transferred securities
157,663

 
33,109

 
124,554

 
(13,865
)
 
(2,912
)
 
(10,953
)
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

 
296

 
1,110

 
1,251

 
263

 
988

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

 
296

 
1,110

 
1,251

 
263

 
988

Total other comprehensive income (loss)
$
159,069

 
$
33,405

 
$
125,664

 
$
(12,614
)
 
$
(2,649
)
 
$
(9,965
)
 
Six Months Ended 
 June 30, 2019
 
Six Months Ended 
 June 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
$
356,286

 
$
74,820

 
$
281,466

 
$
(190,788
)
 
$
(40,066
)
 
$
(150,722
)
Change in net unrealized gain on securities transferred to held to maturity
(652
)
 
(137
)
 
(515
)
 
(4,660
)
 
(979
)
 
(3,681
)
Reclassification adjustment for net (gains) losses included in net income
(169
)
 
(35
)
 
(134
)
 
79

 
17

 
62

Total securities available for sale and transferred securities
355,465

 
74,648

 
280,817

 
(195,369
)
 
(41,028
)
 
(154,341
)
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)
2,812

 
591

 
2,221

 
2,501

 
526

 
1,975

Total defined-benefit post-retirement benefit plans
2,812

 
591

 
2,221

 
2,501

 
526

 
1,975

Total other comprehensive income (loss)
$
358,277

 
$
75,239

 
$
283,038

 
$
(192,868
)
 
$
(40,502
)
 
$
(152,366
)

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
280,951

 
—

 
280,951

Reclassification of amounts included in net income
(134
)
 
2,221

 
2,087

Net other comprehensive income (loss) during period
280,817

 
2,221

 
283,038

Balance at June 30, 2019
$
264,714

 
$
(45,276
)
 
$
219,438

 
 
 
 
 
 
Balance January 1, 2018
$
117,230

 
$
(37,718
)
 
$
79,512

Other comprehensive income (loss) before reclassifications
(154,403
)
 
—

 
(154,403
)
Reclassification of amounts included in net income
62

 
1,975

 
2,037

Net other comprehensive income (loss) during period
(154,341
)
 
1,975

 
(152,366
)
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 June 30, 2018
$
(19,554
)
 
$
(43,765
)
 
$
(63,319
)