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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
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 13 – Defined Benefit Plans).
 
Three Months Ended 
 September 30, 2017
 
Three Months Ended 
 September 30, 2016
 
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
$
7,082

 
$
2,479

 
$
4,603

 
$
(95,641
)
 
$
(33,473
)
 
$
(62,168
)
Change in net unrealized gain on securities transferred to held to maturity
(3,514
)
 
(1,230
)
 
(2,284
)
 
(7,278
)
 
(2,547
)
 
(4,731
)
Reclassification adjustment for net (gains) losses included in net income
4,867

 
1,703

 
3,164

 
37

 
12

 
25

Total securities available for sale and transferred securities
8,435

 
2,952

 
5,483

 
(102,882
)
 
(36,008
)
 
(66,874
)
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)
1,357

 
475

 
882

 
1,585

 
555

 
1,030

Total defined-benefit post-retirement benefit plans
1,357

 
475

 
882

 
1,585

 
555

 
1,030

Total other comprehensive income (loss)
$
9,792

 
$
3,427

 
$
6,365

 
$
(101,297
)
 
$
(35,453
)
 
$
(65,844
)
 
 
Nine Months Ended 
 September 30, 2017
 
Nine Months Ended 
 September 30, 2016
 
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
$
131,283

 
$
45,949

 
$
85,334

 
$
191,865

 
$
67,154

 
$
124,711

Change in net unrealized gain on securities transferred to held to maturity
(13,660
)
 
(4,781
)
 
(8,879
)
 
(24,629
)
 
(8,620
)
 
(16,009
)
Reclassification adjustment for net (gains) losses included in net income
4,917

 
1,721

 
3,196

 
(14,866
)
 
(5,204
)
 
(9,662
)
Total securities available for sale and transferred securities
122,540

 
42,889

 
79,651

 
152,370

 
53,330

 
99,040

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

 
—

 
—

 
(862
)
 
(302
)
 
(560
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
4,072

 
1,425

 
2,647

 
4,878

 
1,708

 
3,170

Total defined-benefit post-retirement benefit plans
4,072

 
1,425

 
2,647

 
4,016

 
1,406

 
2,610

Total other comprehensive income (loss)
$
126,612

 
$
44,314

 
$
82,298

 
$
156,386

 
$
54,736

 
$
101,650
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, 2017
$
16,153

 
$
(40,776
)
 
$
(24,623
)
Other comprehensive income (loss) before reclassifications
76,455

 
—

 
76,455

Amounts reclassified from accumulated other comprehensive income (loss)
3,196

 
2,647

 
5,843

Net other comprehensive income (loss) during period
79,651

 
2,647

 
82,298

Balance at September 30, 2017
$
95,804

 
$
(38,129
)
 
$
57,675

 
 
 
 
 
 
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