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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)
The tax effects allocated to each component of other comprehensive income (loss) were as follows:
 
Before Tax
Amount
 
Tax Expense,
(Benefit)
 
Net of Tax
Amount
2017
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
157,016

 
$
48,626

 
$
108,390

Change in net unrealized gain on securities transferred to held to maturity
(16,193
)
 
(5,668
)
 
(10,525
)
Reclassification adjustment for net (gains) losses included in net income
4,941

 
1,729

 
3,212

Total securities available for sale and transferred securities
145,764

 
44,687

 
101,077

Defined-benefit post-retirement benefit plans:
 
 
 
 
 
Change in the net actuarial gain/loss
(597
)
 
(126
)
 
(471
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
5,429

 
1,900

 
3,529

Total defined-benefit post-retirement benefit plans
4,832

 
1,774

 
3,058

Total other comprehensive income (loss)
$
150,596

 
$
46,461

 
$
104,135

 
 
 
 
 
 
2016
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
(175,061
)
 
$
(61,271
)
 
$
(113,790
)
Change in net unrealized gain on securities transferred to held to maturity
(32,207
)
 
(11,272
)
 
(20,935
)
Reclassification adjustment for net (gains) losses included in net income
(14,975
)
 
(5,242
)
 
(9,733
)
Total securities available for sale and transferred securities
(222,243
)
 
(77,785
)
 
(144,458
)
Defined-benefit post-retirement benefit plans:
 
 
 
 
 
Change in the net actuarial gain/loss
1,914

 
670

 
1,244

Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
7,274

 
2,546

 
4,728

Total defined-benefit post-retirement benefit plans
9,188

 
3,216

 
5,972

Total other comprehensive income (loss)
$
(213,055
)
 
$
(74,569
)
 
$
(138,486
)
 
 
 
 
 
 
2015
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
(12,450
)
 
$
(4,358
)
 
$
(8,092
)
Change in net unrealized gain on securities transferred to held to maturity
(33,601
)
 
(11,760
)
 
(21,841
)
Reclassification adjustment for net (gains) losses included in net income
(69
)
 
(24
)
 
(45
)
Total securities available for sale and transferred securities
(46,120
)
 
(16,142
)
 
(29,978
)
Defined-benefit post-retirement benefit plans:
 
 

 

Change in the net actuarial gain/loss
(3,877
)
 
(1,357
)
 
(2,520
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
6,995

 
2,448

 
4,547

Total defined-benefit post-retirement benefit plans
3,118

 
1,091

 
2,027

Total other comprehensive income (loss)
$
(43,002
)
 
$
(15,051
)
 
$
(27,951
)
Activity in accumulated other comprehensive income, 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 reclassification
97,865

 
(471
)
 
97,394

Amounts reclassified from accumulated other comprehensive income (loss)
3,212

 
3,529

 
6,741

Net other comprehensive income (loss) during period
101,077

 
3,058

 
104,135

Balance December 31, 2017
$
117,230

 
$
(37,718
)
 
$
79,512

 
 
 
 
 
 
Balance January 1, 2016
$
160,611

 
$
(46,748
)
 
$
113,863

Other comprehensive income (loss) before reclassification
(134,725
)
 
1,244

 
(133,481
)
Amounts reclassified from accumulated other comprehensive income (loss)
(9,733
)
 
4,728

 
(5,005
)
Net other comprehensive income (loss) during period
(144,458
)
 
5,972

 
(138,486
)
Balance December 31, 2016
$
16,153

 
$
(40,776
)
 
$
(24,623
)
 
 
 
 
 
 
Balance January 1, 2015
$
190,589

 
$
(48,775
)
 
$
141,814

Other comprehensive income (loss) before reclassification
(29,933
)
 
(2,520
)
 
(32,453
)
Amounts reclassified from accumulated other comprehensive income (loss)
(45
)
 
4,547

 
4,502

Net other comprehensive income (loss) during period
(29,978
)
 
2,027

 
(27,951
)
Balance December 31, 2015
$
160,611

 
$
(46,748
)
 
$
113,863