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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Changes in the components of other comprehensive income (loss)
Changes in the components of other comprehensive income, net of tax, were as follows for the periods presented:
 
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Three months ended March 31, 2017
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
4,739

 
$
1,832

 
$
2,907

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(246
)
 
(95
)
 
(151
)
Total securities available for sale
4,493

 
1,737

 
2,756

Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
276

 
107

 
169

Total derivative instruments
276

 
107

 
169

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Amortization of net actuarial loss recognized in net periodic pension cost
113

 
44

 
69

Total defined benefit pension and post-retirement benefit plans
113

 
44

 
69

Total other comprehensive income
$
4,882

 
$
1,888

 
$
2,994

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 loss 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

 
 
 
 
 
 
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:
 
 
March 31,
2017
 
December 31, 2016
Unrealized gains on securities
$
11,274

 
$
9,490

Non-credit related portion of other-than-temporary impairment on securities
(15,747
)
 
(16,719
)
Unrealized losses on derivative instruments
(1,186
)
 
(1,355
)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations
(7,251
)
 
(7,320
)
Total accumulated other comprehensive loss
$
(12,910
)
 
$
(15,904
)