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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Changes in the components of other comprehensive income (loss)
Changes in the components of other comprehensive income (loss), net of tax, were as follows for the periods presented:
 
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Three months ended September 30, 2018
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding losses on securities
$
(6,548
)
 
$
(1,666
)
 
$
(4,882
)
Reclassification adjustment for losses realized in net income
15

 
4

 
11

Total securities available for sale
(6,533
)
 
(1,662
)
 
(4,871
)
Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
857

 
218

 
639

Total derivative instruments
857

 
218

 
639

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
82

 
21

 
61

Total defined benefit pension and post-retirement benefit plans
82

 
21

 
61

Total other comprehensive loss
$
(5,594
)
 
$
(1,423
)
 
$
(4,171
)
Three months ended September 30, 2017
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding losses on securities
$
(1,188
)

$
(459
)

$
(729
)
Unrealized holding gains on securities transferred from held to maturity to available for sale
13,218

 
5,110

 
8,108

Reclassification adjustment for gains realized in net income
(57
)
 
(22
)
 
(35
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(7
)
 
(3
)
 
(4
)
Total securities available for sale
11,966

 
4,626

 
7,340

Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
163

 
63

 
100

Total derivative instruments
163

 
63

 
100

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
101

 
39

 
62

Total defined benefit pension and post-retirement benefit plans
101

 
39

 
62

Total other comprehensive income
$
12,230

 
$
4,728

 
$
7,502

 
 
 
 
 
 
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Nine months ended September 30, 2018
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding losses on securities
$
(21,182
)
 
$
(5,391
)
 
$
(15,791
)
Reclassification adjustment for losses realized in net income
15

 
4

 
11

Total securities available for sale
(21,167
)
 
(5,387
)
 
(15,780
)
Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
2,527

 
643

 
1,884

Total derivative instruments
2,527

 
643

 
1,884

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
246

 
62

 
184

Total defined benefit pension and post-retirement benefit plans
246

 
62

 
184

Total other comprehensive loss
$
(18,394
)
 
$
(4,682
)
 
$
(13,712
)
 
 
 
 
 
 
Nine months ended September 30, 2017
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
7,739


$
2,992


$
4,747

Unrealized holding gains on securities transferred from HTM to AFS
13,218


5,110


8,108

Reclassification adjustment for gains realized in net income
(57
)
 
(22
)
 
(35
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(282
)
 
(109
)
 
(173
)
Total securities available for sale
20,618

 
7,971

 
12,647

Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
169

 
65

 
104

Total derivative instruments
169

 
65

 
104

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
305

 
118

 
187

Total defined benefit pension and post-retirement benefit plans
305

 
118

 
187

Total other comprehensive income
$
21,092

 
$
8,154

 
$
12,938
Accumulated balances for each component of other comprehensive income (loss), net of tax
The accumulated balances for each component of other comprehensive income (loss), net of tax, were as follows as of the dates presented:
 
 
September 30,
2018
 
December 31, 2017
Unrealized gains (losses) on securities
$
(6,410
)
 
$
7,363

Non-credit related portion of other-than-temporary impairment on securities
(11,320
)
 
(9,313
)
Unrealized gains (losses) on derivative instruments
889

 
(995
)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations
(7,382
)
 
(7,566
)
Total accumulated other comprehensive loss
$
(24,223
)
 
$
(10,511
)