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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Changes in the components of other comprehensive income
Changes in the components of other comprehensive income were as follows for the periods presented:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Three months ended March 31, 2016
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
5,060

 
$
1,953

 
$
3,107

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(33
)
 
(13
)
 
(20
)
Total securities available for sale
5,027

 
1,940

 
3,087

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(2,062
)
 
(796
)
 
(1,266
)
Total derivative instruments
(2,062
)
 
(796
)
 
(1,266
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial gain recognized in net periodic pension cost
117

 
45

 
72

Total defined benefit pension and post-retirement benefit plans
117

 
45

 
72

Total other comprehensive income
$
3,082

 
$
1,189

 
$
1,893

Three months ended March 31, 2015
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
4,249

 
$
1,625

 
$
2,624

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(51
)
 
(19
)
 
(32
)
Total securities available for sale
4,198

 
1,606

 
2,592

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(1,084
)
 
(415
)
 
(669
)
Total derivative instruments
(1,084
)
 
(415
)
 
(669
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial gain recognized in net periodic pension cost
93

 
36

 
57

Total defined benefit pension and post-retirement benefit plans
93

 
36

 
57

Total other comprehensive income
$
3,207

 
$
1,227

 
$
1,980
Accumulated balances for each component of other comprehensive income, net of tax
The accumulated balances for each component of other comprehensive income, net of tax, were as follows as of the dates presented:
 
 
March 31,
2016
 
December 31, 2015
Unrealized gains on securities
$
19,587

 
$
16,500

Non-credit related portion of other-than-temporary impairment on securities
(16,735
)
 
(16,735
)
Unrealized losses on derivative instruments
(3,148
)
 
(1,882
)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations
(7,346
)
 
(7,418
)
Total accumulated other comprehensive loss
$
(7,642
)
 
$
(9,535
)