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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2016
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. 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 
 September 30, 2016
 
Three Months Ended 
 September 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
$
(95,641
)
 
$
(33,473
)
 
$
(62,168
)
 
$
86,445

 
$
30,256

 
$
56,189

Change in net unrealized gain on securities transferred to held to maturity
(7,278
)
 
(2,547
)
 
(4,731
)
 
(8,831
)
 
(3,091
)
 
(5,740
)
Reclassification adjustment for net (gains) losses included in net income
37

 
12

 
25

 
52

 
18

 
34

Total securities available for sale and transferred securities
(102,882
)
 
(36,008
)
 
(66,874
)
 
77,666

 
27,183

 
50,483

Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
1,585

 
555

 
1,030

 
1,748

 
612

 
1,136

Remeasurement of projected benefit obligation related to SERP
—

 
—

 
—

 
—

 
—

 
—

Reclassification adjustment for SERP settlement costs included in net income
—

 
—

 
—

 
—

 
—

 
—

Total defined-benefit post-retirement benefit plans
1,585

 
555

 
1,030

 
1,748

 
612

 
1,136

Total other comprehensive income (loss)
$
(101,297
)
 
$
(35,453
)
 
$
(65,844
)
 
$
79,414

 
$
27,795

 
$
51,619

 
 
Nine Months Ended 
 September 30, 2016
 
Nine Months Ended 
 September 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
$
191,865

 
$
67,154

 
$
124,711

 
$
7,704

 
$
2,697

 
$
5,007

Change in net unrealized gain on securities transferred to held to maturity
(24,629
)
 
(8,620
)
 
(16,009
)
 
(24,925
)
 
(8,724
)
 
(16,201
)
Reclassification adjustment for net (gains) losses included in net income
(14,866
)
 
(5,204
)
 
(9,662
)
 
(176
)
 
(62
)
 
(114
)
Total securities available for sale and transferred securities
152,370

 
53,330

 
99,040

 
(17,397
)
 
(6,089
)
 
(11,308
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
 
 
 
 
 
 
Change in the net actuarial gain/loss
4,691

 
1,642

 
3,049

 
5,246

 
1,836

 
3,410

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
4,016

 
1,406

 
2,610

 
5,246

 
1,836

 
3,410

Total other comprehensive income (loss)
$
156,386

 
$
54,736

 
$
101,650

 
$
(12,151
)
 
$
(4,253
)
 
$
(7,898
)
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, 2016
$
160,611

 
$
(46,748
)
 
$
113,863

Other comprehensive income (loss) before reclassifications
108,702

 
2,489

 
111,191

Amounts reclassified from accumulated other comprehensive income (loss)
(9,662
)
 
121

 
(9,541
)
Net other comprehensive income (loss) during period
99,040

 
2,610

 
101,650

Balance at September 30, 2016
$
259,651

 
$
(44,138
)
 
$
215,513

 
 
 
 
 
 
Balance January 1, 2015
$
190,589

 
$
(48,775
)
 
$
141,814

Other comprehensive income (loss) before reclassifications
(11,194
)
 
3,410

 
(7,784
)
Amounts reclassified from accumulated other comprehensive income (loss)
(114
)
 
—

 
(114
)
Net other comprehensive income (loss) during period
(11,308
)
 
3,410

 
(7,898
)
Balance at September 30, 2015
$
179,281

 
$
(45,365
)
 
$
133,916