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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of other comprehensive income
The following table presents the components of other comprehensive income (loss) for the three and nine months ended September 30, 2013 and 2012:
(dollars in thousands)
Before Tax

 
Tax Effect

 
Net of Tax

Three Months Ended September 30, 2013
 

 
 

 
 

Net Unrealized Losses on Investment Securities:
 

 
 

 
 

Net Unrealized Losses Arising During the Period
$
(9,913
)
 
$
(3,909
)
 
$
(6,004
)
Less: Reclassification Adjustment for Gains Realized in Net Income 1
(1,621
)
 
(639
)
 
(982
)
Net Unrealized Losses on Investment Securities
(11,534
)
 
(4,548
)
 
(6,986
)
Defined Benefit Plans:
 

 
 

 
 

Amortization of Net Actuarial Losses
414

 
163

 
251

Amortization of Prior Service Credit
(81
)
 
(32
)
 
(49
)
Defined Benefit Plans, Net
333

 
131

 
202

Other Comprehensive Loss
$
(11,201
)
 
$
(4,417
)
 
$
(6,784
)
 
 
 
 
 
 
Three Months Ended September 30, 2012
 

 
 

 
 

Net Unrealized Gains on Investment Securities:
 

 
 

 
 

Net Unrealized Gains Arising During the Period
$
20,129

 
$
7,893

 
$
12,236

Less: Reclassification Adjustment for Gains Realized in Net Income 1
(4,099
)
 
(1,633
)
 
(2,466
)
Net Unrealized Gains on Investment Securities
16,030

 
6,260

 
9,770

Defined Benefit Plans:
 

 
 

 
 

Amortization of Net Actuarial Losses
331

 
131

 
200

Amortization of Prior Service Credit
(80
)
 
(32
)
 
(48
)
Defined Benefit Plans, Net
251

 
99

 
152

Other Comprehensive Income
$
16,281

 
$
6,359

 
$
9,922

 
 
 
 
 
 
Nine Months Ended September 30, 2013
 

 
 

 
 

Net Unrealized Losses on Investment Securities:
 

 
 

 
 

Net Unrealized Losses Arising During the Period
$
(96,420
)
 
$
(38,002
)
 
$
(58,418
)
Less: Reclassification Adjustment for Gains Realized in Net Income 1
(7,894
)
 
(3,113
)
 
(4,781
)
Net Unrealized Losses on Investment Securities
(104,314
)
 
(41,115
)
 
(63,199
)
Defined Benefit Plans:
 

 
 

 
 

Net Actuarial Losses Arising During the Period
(206
)
 
(81
)
 
(125
)
Amortization of Net Actuarial Losses
1,241

 
489

 
752

Amortization of Prior Service Credit
(242
)
 
(96
)
 
(146
)
Defined Benefit Plans, Net
793

 
312

 
481

Other Comprehensive Loss
$
(103,521
)
 
$
(40,803
)
 
$
(62,718
)
 
 
 
 
 
 
Nine Months Ended September 30, 2012
 

 
 

 
 

Net Unrealized Gains on Investment Securities:
 

 
 

 
 

Net Unrealized Gains Arising During the Period
$
23,125

 
$
9,111

 
$
14,014

Less: Reclassification Adjustment for Gains Realized in Net Income 1
(12,062
)
 
(4,751
)
 
(7,311
)
Net Unrealized Gains on Investment Securities
11,063

 
4,360

 
6,703

Defined Benefit Plans:
 

 
 

 
 

Amortization of Net Actuarial Losses
998

 
393

 
605

Amortization of Prior Service Credit
(242
)
 
(95
)
 
(147
)
Defined Benefit Plans, Net
756

 
298

 
458

Other Comprehensive Income
$
11,819

 
$
4,658

 
$
7,161


1 
Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
Schedule of accumulated other comprehensive income (loss)
The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax, for the three and nine months ended September 30, 2013 and 2012:
(dollars in thousands)
 
Investment Securities-Available-for-Sale1

 
Investment Securities-Held-to-Maturity1

 
Defined Benefit Plans1

 
Accumulated Other Comprehensive Income (Loss)

Three Months Ended September 30, 2013
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
(1,283
)
 
$
4,847

 
$
(30,290
)
 
$
(26,726
)
Other Comprehensive Loss Before Reclassifications
 
5,692

 
(11,696
)
 
—

 
(6,004
)
Amounts Reclassified from Accumulated Other
        Comprehensive Income
 
—

 
(982
)
 
202

 
(780
)
Total Other Comprehensive Income (Loss)
 
5,692

 
(12,678
)
 
202

 
(6,784
)
Balance at End of Period
 
$
4,409

 
$
(7,831
)
 
$
(30,088
)
 
$
(33,510
)
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2012
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
41,210

 
$
18,656

 
$
(27,364
)
 
$
32,502

Other Comprehensive Income Before Reclassifications
 
12,255

 
(19
)
 
—

 
12,236

Amounts Reclassified from Accumulated Other
        Comprehensive Income
 
(8
)
 
(2,458
)
 
152

 
(2,314
)
Total Other Comprehensive Income (Loss)
 
12,247

 
(2,477
)
 
152

 
9,922

Balance at End of Period
 
$
53,457

 
$
16,179

 
$
(27,212
)
 
$
42,424

 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2013
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
45,996

 
$
13,781

 
$
(30,569
)
 
$
29,208

Other Comprehensive Loss Before Reclassifications
 
(41,587
)
 
(16,831
)
 
(125
)
 
(58,543
)
Amounts Reclassified from Accumulated Other
        Comprehensive Income
 
—

 
(4,781
)
 
606

 
(4,175
)
Total Other Comprehensive Income (Loss)
 
(41,587
)
 
(21,612
)
 
481

 
(62,718
)
Balance at End of Period
 
$
4,409

 
$
(7,831
)
 
$
(30,088
)
 
$
(33,510
)
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2012
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
39,396

 
$
23,537

 
$
(27,670
)
 
$
35,263

Other Comprehensive Income Before Reclassifications
 
14,014

 
—

 
—

 
14,014

Amounts Reclassified from Accumulated Other
        Comprehensive Income
 
47

 
(7,358
)
 
458

 
(6,853
)
Total Other Comprehensive Income (Loss)
 
14,061

 
(7,358
)
 
458

 
7,161

Balance at End of Period
 
$
53,457

 
$
16,179

 
$
(27,212
)
 
$
42,424

1 
Amounts in parentheses indicate debits.
Reclassification out of accumulated other comprehensive income
The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2013 and 2012:
Details about Accumulated Other
Comprehensive Income (Loss) Components 
Amount Reclassified from Accumulated Other Comprehensive Income(Loss)1
 
Affected Line Item in the Statement Where Net Income Is Presented
 
Three Months Ended
September 30,
 
(dollars in thousands)
2013

2012

 
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Transferred from Available-for-Sale to Held-to-Maturity                                                                                           
$
1,621

$
4,086

Interest Income
 
(639
)
(1,628
)
Tax Expense
 
982

2,458

Net of Tax
Sale of Investment Securities Available-for-Sale
—

13

Investment Securities Gains (Losses), Net
 
—

(5
)
Tax Expense
 
—

8

Net of tax
 
 
 
 
Amortization of Defined Benefit Plan Items
 
 
 
Prior Service Credit 2
81

80

 
Net Actuarial Losses 2
(414
)
(331
)
 
 
(333
)
(251
)
Total Before Tax
 
131

99

Tax Benefit
 
(202
)
(152
)
Net of Tax
 
 
 
 
Total Reclassifications for the Period
$
780

$
2,314

Net of Tax
 
 
 
 
Details about Accumulated Other
Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1
 
Affected Line Item in the Statement Where Net Income Is Presented
 
Nine Months Ended
September 30,
 
(dollars in thousands)
2013

2012

 
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Transferred from Available-for-Sale to Held-to-Maturity                                                                                           
$
7,894

$
12,139

Interest Income
 
(3,113
)
(4,781
)
Tax Expense
 
4,781

7,358

Net of Tax
Sale of Investment Securities Available-for-Sale
—

(77
)
Investment Securities Gains (Losses), Net
 
—

30

Tax Benefit
 
—

(47
)
Net of tax
 
 
 
 
Amortization of Defined Benefit Plan Items
 
 
 
Prior Service Credit 2
242

242

 
Net Actuarial Losses 2
(1,241
)
(998
)
 
 
(999
)
(756
)
Total Before Tax
 
393

298

Tax Benefit
 
(606
)
(458
)
Net of Tax
 
 
 
 
Total Reclassifications for the Period
$
4,175

$
6,853

Net of Tax
1 
Amounts in parentheses indicate reductions to net income.
2 
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Salaries and Benefits on the consolidated statements of income (see Note 9 for additional details).