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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2016
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
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
)
 
Before Tax
Amount
 
Tax Expense,
(Benefit)
 
Net of Tax
Amount
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
)
 
 
 
 
 
 
2014
 
 
 
 
 
Securities available for sale and transferred securities:
 
 
 
 
 
Change in net unrealized gain/loss during the period
$
103,044

 
$
36,065

 
$
66,979

Change in net unrealized gain on securities transferred to held to maturity
(35,441
)
 
(12,404
)
 
(23,037
)
Reclassification adjustment for net (gains) losses included in net income
(38
)
 
(13
)
 
(25
)
Total securities available for sale and transferred securities
67,565

 
23,648

 
43,917

Defined-benefit post-retirement benefit plans:
 
 

 

Change in the net actuarial gain/loss
(37,524
)
 
(13,133
)
 
(24,391
)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
2,687

 
940

 
1,747

Total defined-benefit post-retirement benefit plans
(34,837
)
 
(12,193
)
 
(22,644
)
Derivatives:
 
 


 


Reclassification adjustment for gains on interest rate swaps on variable-rate loans included in net income
(30,604
)
 
(10,711
)
 
(19,893
)
Total other comprehensive income (loss)
$
2,124

 
$
744

 
$
1,380

Activity in accumulated other comprehensive income, net of tax, was as follows:
 
Securities
Available
For Sale
 
Defined
Benefit
Plans
 
Derivatives
 
Accumulated
Other
Comprehensive
Income
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


 
Securities
Available
For Sale
 
Defined
Benefit
Plans
 
Derivatives
 
Accumulated
Other
Comprehensive
Income
Balance January 1, 2014
$
146,672

 
$
(26,131
)
 
$
19,893

 
$
140,434

Other comprehensive income (loss) before reclassification
43,942

 
(24,391
)
 
—

 
19,551

Amounts reclassified from accumulated other comprehensive income (loss)
(25
)
 
1,747

 
(19,893
)
 
(18,171
)
Net other comprehensive income (loss) during period
43,917

 
(22,644
)
 
(19,893
)
 
1,380

Balance December 31, 2014
$
190,589

 
$
(48,775
)
 
$
—

 
$
141,814