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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
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 
 June 30, 2018
 
Three Months Ended 
 June 30, 2017
 
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
$
(11,884
)
 
$
(2,496
)
 
$
(9,388
)
 
$
90,390

 
$
31,636

 
$
58,754

Change in net unrealized gain on securities transferred to held to maturity
(2,041
)
 
(429
)
 
(1,612
)
 
(3,860
)
 
(1,351
)
 
(2,509
)
Reclassification adjustment for net (gains) losses included in net income
60

 
13

 
47

 
50

 
18

 
32

Total securities available for sale and transferred securities
(13,865
)
 
(2,912
)
 
(10,953
)
 
86,580

 
30,303

 
56,277

Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
—

 
—

 
—

 
—

 
—

 
—

Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
1,251

 
263

 
988

 
1,358

 
475

 
883

Total defined-benefit post-retirement benefit plans
1,251

 
263

 
988

 
1,358

 
475

 
883

Total other comprehensive income (loss)
$
(12,614
)
 
$
(2,649
)
 
$
(9,965
)
 
$
87,938

 
$
30,778

 
$
57,160

 
Six Months Ended 
 June 30, 2018
 
Six Months Ended 
 June 30, 2017
 
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
$
(190,788
)
 
$
(40,066
)
 
$
(150,722
)
 
$
124,201

 
$
43,470

 
$
80,731

Change in net unrealized gain on securities transferred to held to maturity
(4,660
)
 
(979
)
 
(3,681
)
 
(10,146
)
 
(3,551
)
 
(6,595
)
Reclassification adjustment for net (gains) losses included in net income
79

 
17

 
62

 
50

 
18

 
32

Total securities available for sale and transferred securities
(195,369
)
 
(41,028
)
 
(154,341
)
 
114,105

 
39,937

 
74,168

Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
—

 
—

 
—

 
—

 
—

 
—

Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
2,501

 
526

 
1,975

 
2,715

 
950

 
1,765

Total defined-benefit post-retirement benefit plans
2,501

 
526

 
1,975

 
2,715

 
950

 
1,765

Total other comprehensive income (loss)
$
(192,868
)
 
$
(40,502
)
 
$
(152,366
)
 
$
116,820

 
$
40,887

 
$
75,933
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, 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
)
 
 
 
 
 
 
Balance January 1, 2017
$
16,153

 
$
(40,776
)
 
$
(24,623
)
Other comprehensive income (loss) before reclassifications
74,136

 
—

 
74,136

Reclassification of amounts included in net income
32

 
1,765

 
1,797

Net other comprehensive income (loss) during period
74,168

 
1,765

 
75,933

Balance at June 30, 2017
$
90,321

 
$
(39,011
)
 
$
51,310