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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Changes in the components of other comprehensive income
Changes in the components of other comprehensive income were as follows:
 
 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Three months ended June 30, 2013
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding losses on securities
$
(11,369
)
 
$
(4,350
)
 
$
(7,019
)
Non-credit related portion of other-than-temporary impairment on securities
—

 
—

 
—

Reclassification adjustment for gains realized in net income
—

 
—

 
—

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(88
)
 
(34
)
 
(54
)
Total securities available for sale
(11,457
)
 
(4,384
)
 
(7,073
)
Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
1,607

 
615

 
992

Reclassification adjustment for gains realized in net income
(83
)
 
(32
)
 
(51
)
Total derivative instruments
1,524

 
583

 
941

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Net gain (loss) arising during the period
—

 
—

 
—

Amortization of net actuarial loss recognized in net periodic pension cost
138

 
53

 
85

Total defined benefit pension and post-retirement benefit plans
138

 
53

 
85

Total other comprehensive income
$
(9,795
)
 
$
(3,748
)
 
$
(6,047
)
Three months ended June 30, 2012
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
1,766

 
$
676

 
$
1,090

Non-credit related portion of other-than-temporary impairment on securities
—

 
—

 
—

Reclassification adjustment for gains realized in net income
(869
)
 
(332
)
 
(537
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(148
)
 
(57
)
 
(91
)
Total securities available for sale
749

 
287

 
462

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(1,664
)
 
(637
)
 
(1,027
)
Reclassification adjustment for gains realized in net income
(152
)
 
(58
)
 
(94
)
Total derivative instruments
(1,816
)
 
(695
)
 
(1,121
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Net gain (loss) arising during the period
—

 
—

 
—

Amortization of net actuarial loss recognized in net periodic pension cost
107

 
41

 
66

Total defined benefit pension and post-retirement benefit plans
107

 
41

 
66

Total other comprehensive income
$
(960
)
 
$
(367
)
 
$
(593
)

 
Pre-Tax
 
Tax Expense
(Benefit)
 
Net of Tax
Six months ended June 30, 2013
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding losses on securities
$
(11,133
)
 
$
(4,260
)
 
$
(6,873
)
Non-credit related portion of other-than-temporary impairment on securities
—

 
—

 
—

Reclassification adjustment for losses realized in net income
115

 
44

 
71

Amortization of unrealized holding gains on securities transferred to the held to maturity category
(194
)
 
(74
)
 
(120
)
Total securities available for sale
(11,212
)
 
(4,290
)
 
(6,922
)
Derivative instruments:
 
 
 
 
 
Unrealized holding gains on derivative instruments
1,942

 
743

 
1,199

Reclassification adjustment for gains realized in net income
(168
)
 
(64
)
 
(104
)
Total derivative instruments
1,774

 
679

 
1,095

Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Net gain (loss) arising during the period
—

 
—

 
—

Amortization of net actuarial loss recognized in net periodic pension cost
254

 
97

 
157

Total defined benefit pension and post-retirement benefit plans
254

 
97

 
157

Total other comprehensive income
$
(9,184
)
 
$
(3,514
)
 
$
(5,670
)
Six months ended June 30, 2012
 
 
 
 
 
Securities available for sale:
 
 
 
 
 
Unrealized holding gains on securities
$
3,414

 
$
1,306

 
$
2,108

Non-credit related portion of other-than-temporary impairment on securities
—

 
—

 
—

Reclassification adjustment for gains realized in net income
(1,773
)
 
(678
)
 
(1,095
)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
(313
)
 
(120
)
 
(193
)
Total securities available for sale
1,328

 
508

 
820

Derivative instruments:
 
 
 
 
 
Unrealized holding losses on derivative instruments
(1,843
)
 
(705
)
 
(1,138
)
Reclassification adjustment for gains realized in net income
(304
)
 
(116
)
 
(188
)
Total derivative instruments
(2,147
)
 
(821
)
 
(1,326
)
Defined benefit pension and post-retirement benefit plans:
 
 
 
 
 
Net gain (loss) arising during the period
—

 
—

 
—

Amortization of net actuarial loss recognized in net periodic pension cost
214

 
82

 
132

Total defined benefit pension and post-retirement benefit plans
214

 
82

 
132

Total other comprehensive income
$
(605
)
 
$
(231
)
 
$
(374
)
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:
 
 
June 30,
2013
 
December 31, 2012
Unrealized gains on securities
$
10,506

 
$
17,428

Non-credit related portion of other-than-temporary impairment on securities
(17,474
)
 
(17,474
)
Unrealized losses on derivative instruments
(116
)
 
(1,211
)
Unrecognized defined benefit pension and post-retirement benefit plans obligations
(7,087
)
 
(7,244
)
Total accumulated other comprehensive loss
$
(14,171
)
 
$
(8,501
)