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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
4,188

 
$
1,619

 
$
2,569

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(29
)
 
(11
)
 
(18
)
Total securities available for sale
4,159

 
1,608

 
2,551

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(270
)
 
(105
)
 
(165
)
Total derivative instruments
(270
)
 
(105
)
 
(165
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
91

 
35

 
56

Total defined benefit pension and post-retirement benefit plans
91

 
35

 
56

Total other comprehensive income
$
3,980

 
$
1,538

 
$
2,442

Three months ended June 30, 2016
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
1,326

 
$
514

 
$
812

Reclassification adjustment for gains realized in net income
(1,257
)
 
(485
)
 
(772
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(28
)
 
(10
)
 
(18
)
Total securities available for sale
41

 
19

 
22

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(704
)
 
(276
)
 
(428
)
Total derivative instruments
(704
)
 
(276
)
 
(428
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
119

 
39

 
80

Total defined benefit pension and post-retirement benefit plans
119

 
39

 
80

Total other comprehensive loss
$
(544
)
 
$
(218
)
 
$
(326
)
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Six months ended June 30, 2017
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
8,927

 
$
3,451

 
$
5,476

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(275
)
 
(106
)
 
(169
)
Total securities available for sale
8,652

 
3,345

 
5,307

Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
6

 
2

 
4

Total derivative instruments
6

 
2

 
4

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
204

 
79

 
125

Total defined benefit pension and post-retirement benefit plans
204

 
79

 
125

Total other comprehensive income
$
8,862

 
$
3,426

 
$
5,436

Six months ended June 30, 2016
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
6,315

 
$
2,440

 
$
3,875

Reclassification adjustment for gains realized in net income
(1,186
)
 
(458
)
 
(728
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(61
)
 
(23
)
 
(38
)
Total securities available for sale
5,068

 
1,959

 
3,109

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(2,766
)
 
(1,072
)
 
(1,694
)
Total derivative instruments
(2,766
)
 
(1,072
)
 
(1,694
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
236

 
84

 
152

Total defined benefit pension and post-retirement benefit plans
236

 
84

 
152

Total other comprehensive income
$
2,538

 
$
971

 
$
1,567
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:
 
 
June 30,
2017
 
December 31, 2016
Unrealized gains on securities
$
14,797

 
$
9,490

Non-credit related portion of other-than-temporary impairment on securities
(16,719
)
 
(16,719
)
Unrealized losses on derivative instruments
(1,351
)
 
(1,355
)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations
(7,195
)
 
(7,320
)
Total accumulated other comprehensive loss
$
(10,468
)
 
$
(15,904
)