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Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2016
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. The change in the net actuarial gain/loss on defined-benefit post-retirement benefit plans is included in the computation of net periodic pension expense (see Note 12 – Defined Benefit Plans).
 
Three Months Ended 
 June 30, 2016
 
Three Months Ended 
 June 30, 2015
 
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
$
165,288

 
$
57,851

 
$
107,437

 
$
(113,268
)
 
$
(39,643
)
 
$
(73,625
)
Change in net unrealized gain on securities transferred to held to maturity
(9,185
)
 
(3,215
)
 
(5,970
)
 
(8,207
)
 
(2,873
)
 
(5,334
)
Reclassification adjustment for net (gains) losses included in net income
—

 
—

 
—

 
—

 
—

 
—

Total securities available for sale and transferred securities
156,103

 
54,636

 
101,467

 
(121,475
)
 
(42,516
)
 
(78,959
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
1,553

 
543

 
1,010

 
1,749

 
612

 
1,137

Remeasurement of projected benefit obligation related to SERP
(862
)
 
(302
)
 
(560
)
 
—

 
—

 
—

Reclassification adjustment for SERP settlement costs included in net income
187

 
66

 
121

 
—

 
—

 
—

Total defined-benefit post-retirement benefit plans
878

 
307

 
571

 
1,749

 
612

 
1,137

Total other comprehensive income (loss)
$
156,981

 
$
54,943

 
$
102,038

 
$
(119,726
)
 
$
(41,904
)
 
$
(77,822
)
 
 
Six Months Ended 
 June 30, 2016
 
Six Months Ended 
 June 30, 2015
 
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
$
287,506

 
$
100,627

 
$
186,879

 
$
(78,741
)
 
$
(27,559
)
 
$
(51,182
)
Change in net unrealized gain on securities transferred to held to maturity
(17,351
)
 
(6,073
)
 
(11,278
)
 
(16,094
)
 
(5,633
)
 
(10,461
)
Reclassification adjustment for net (gains) losses included in net income
(14,903
)
 
(5,216
)
 
(9,687
)
 
(228
)
 
(80
)
 
(148
)
Total securities available for sale and transferred securities
255,252

 
89,338

 
165,914

 
(95,063
)
 
(33,272
)
 
(61,791
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
3,106

 
1,087

 
2,019

 
3,498

 
1,224

 
2,274

Remeasurement of projected benefit obligation related to SERP
(862
)
 
(302
)
 
(560
)
 
—

 
—

 
—

Reclassification adjustment for SERP settlement costs included in net income
187

 
66

 
121

 
—

 
—

 
—

Total defined-benefit post-retirement benefit plans
2,431

 
851

 
1,580

 
3,498

 
1,224

 
2,274

Total other comprehensive income (loss)
$
257,683

 
$
90,189

 
$
167,494

 
$
(91,565
)
 
$
(32,048
)
 
$
(59,517
)
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, 2016
$
160,611

 
$
(46,748
)
 
$
113,863

Other comprehensive income (loss) before reclassifications
175,601

 
1,459

 
177,060

Amounts reclassified from accumulated other comprehensive income (loss)
(9,687
)
 
121

 
(9,566
)
Net other comprehensive income (loss) during period
165,914

 
1,580

 
167,494

Balance at June 30, 2016
$
326,525

 
$
(45,168
)
 
$
281,357

 
 
 
 
 
 
Balance January 1, 2015
$
190,589

 
$
(48,775
)
 
$
141,814

Other comprehensive income (loss) before reclassifications
(61,643
)
 
2,274

 
(59,369
)
Amounts reclassified from accumulated other comprehensive income (loss)
(148
)
 
—

 
(148
)
Net other comprehensive income (loss) during period
(61,791
)
 
2,274

 
(59,517
)
Balance at June 30, 2015
$
128,798

 
$
(46,501
)
 
$
82,297