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Comprehensive Income/Loss (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Comprehensive income
The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
 
Three Months Ended
June 30, 2020
 
Six Months Ended
June 30, 2020
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
2,332

 
$
(637
)
 
$
1,695

 
$
14,455

 
$
(3,413
)
 
$
11,042

Less: net security losses reclassified into other noninterest expense
—

 
—

 
—

 
—

 
—

 
—

Net change in fair value of securities available for sale
2,332

 
(637
)
 
1,695

 
14,455

 
(3,413
)
 
11,042

 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of cash flow hedges
4,250

 
(1,195
)
 
3,055

 
37,817

 
(10,638
)
 
27,179

Less: net cash flow hedge gains reclassified into interest income or interest expense
3,976

 
(1,118
)
 
2,858

 
5,562

 
(1,564
)
 
3,998

Net change in fair value of cash flow hedges
274

 
(77
)
 
197

 
32,255

 
(9,074
)
 
23,181

 
 
 
 
 
 
 
 
 
 
 
 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period
(1
)
 
—

 
(1
)
 
(1,390
)
 
391

 
(999
)
Amortization of net actuarial losses
246

 
(69
)
 
177

 
491

 
(138
)
 
353

Amortization of net prior service costs
69

 
(20
)
 
49

 
138

 
(39
)
 
99

Net change in other comprehensive income for defined benefit postretirement plans (1)
314

 
(89
)
 
225

 
(761
)
 
214

 
(547
)
Total other comprehensive income
$
2,920

 
$
(803
)
 
$
2,117

 
$
45,949

 
$
(12,273
)
 
$
33,676

 
Three Months Ended
June 30, 2019
 
Six Months Ended
June 30, 2019
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
5,663

 
$
(1,269
)
 
$
4,394

 
$
11,841

 
$
(2,718
)
 
$
9,123

Less: net security losses reclassified into other noninterest expense
(1,462
)
 
411

 
(1,051
)
 
(1,462
)
 
411

 
(1,051
)
Net change in fair value of securities available for sale
7,125

 
(1,680
)
 
5,445

 
13,303

 
(3,129
)
 
10,174

 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of cash flow hedges
12,349

 
(3,476
)
 
8,873

 
17,345

 
(4,882
)
 
12,463

Less: net cash flow hedge gains reclassified into interest income or interest expense
394

 
(111
)
 
283

 
818

 
(230
)
 
588

Net change in fair value of cash flow hedges
11,955

 
(3,365
)
 
8,590

 
16,527

 
(4,652
)
 
11,875

 
 
 
 
 
 
 
 
 
 
 
 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period
(11
)
 
3

 
(8
)
 
(22
)
 
6

 
(16
)
Amortization of net actuarial gains
(2
)
 
—

 
(2
)
 
(4
)
 
1

 
(3
)
Amortization of net prior service costs
69

 
(19
)
 
50

 
138

 
(39
)
 
99

Net change in other comprehensive income for defined benefit postretirement plans (1)
56

 
(16
)
 
40

 
112

 
(32
)
 
80

Total other comprehensive income
$
19,136

 
$
(5,061
)
 
$
14,075

 
$
29,942

 
$
(7,813
)
 
$
22,129



(1)
The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission.
Company's accumulated other comprehensive loss, net of tax
Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated:
 
Unrealized Gain (Loss)
on Securities
 
Unrealized Gain on Cash Flow Hedge
 
Defined Benefit Postretirement Plans
 
Accumulated Other Comprehensive Income (Loss)
 
(Dollars in thousands)
 
2020
Beginning balance: January 1, 2020
$
4,398

 
$
16,479

 
$
(2,708
)
 
$
18,169

Net change in other comprehensive income (loss)
11,042

 
23,181

 
(547
)
 
33,676

Ending balance: June 30, 2020
$
15,440

 
$
39,660

 
$
(3,255
)
 
$
51,845

 
2019
Beginning balance: January 1, 2019
$
(5,947
)
 
$
6,148

 
$
(1,374
)
 
$
(1,173
)
Net change in other comprehensive income (loss)
10,174

 
11,875

 
80

 
22,129

Ending balance: June 30, 2019
$
4,227

 
$
18,023

 
$
(1,294
)
 
$
20,956