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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Accumulated other comprehensive income (loss) included the following as of March 31, 2020 and December 31, 2019:
 
March 31, 2020
 
December 31, 2019
(Dollars in thousands)
Accumulated
other
comprehensive
income (loss)
 
Deferred
tax
expense
(benefit)
 
Accumulated
other
comprehensive
income (loss),
net of tax
 
Accumulated
other
comprehensive
income (loss)
 
Deferred
tax
expense
(benefit)
 
Accumulated
other
comprehensive
income (loss),
net of tax
Unrealized gains on securities available for sale
$
132,570

 
$
30,490

 
$
102,080

 
$
7,522

 
$
1,730

 
$
5,792

Defined benefit pension items
(165,834
)
 
(38,142
)
 
(127,692
)
 
(172,098
)
 
(39,583
)
 
(132,515
)
Total
$
(33,264
)
 
$
(7,652
)
 
$
(25,612
)
 
$
(164,576
)
 
$
(37,853
)
 
$
(126,723
)
The following table highlights changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2020 and 2019:
 
Three months ended March 31, 2020
(Dollars in thousands, net of tax)
Unrealized gains on securities available for sale
 
Unrealized losses on securities available for sale transferred to held to maturity
 
Defined benefit pension items
 
Total
Beginning balance
$
5,792

 
$
—

 
$
(132,515
)
 
$
(126,723
)
Net unrealized gains arising during period
111,530

 
—

 
—

 
111,530

Amounts reclassified from accumulated other comprehensive loss
(15,242
)
 
—

 
4,823

 
(10,419
)
Net current period other comprehensive income
96,288

 
—

 
4,823

 
101,111

Ending balance
$
102,080

 
$
—

 
$
(127,692
)
 
$
(25,612
)
 
 
 
 
 
 
 
 
 
Three months ended March 31, 2019
(Dollars in thousands, net of tax)
Unrealized gains on securities available for sale
 
Unrealized losses on securities available for sale transferred to held to maturity
 
Defined benefit pension items
 
Total
Beginning balance
$
(38,505
)
 
$
(71,149
)
 
$
(125,533
)
 
$
(235,187
)
Net unrealized gains arising during period
21,615

 
—

 
—

 
21,615

Amounts reclassified from accumulated other comprehensive loss
—

 
4,591

 
2,121

 
6,712

Net current period other comprehensive income
21,615

 
4,591

 
2,121

 
28,327

Ending balance
$
(16,890
)
 
$
(66,558
)
 
$
(123,412
)
 
$
(206,860
)

The following table presents the amounts reclassified from accumulated other comprehensive income (loss) and the line item affected in the statement where net income is presented for the three months ended March 31, 2020 and 2019:
 
 
Three months ended March 31, 2020
Details about accumulated other comprehensive income (loss)
 
Amounts reclassified from accumulated other comprehensive income (loss)
 
Affected line item in the statement where net income is presented
Unrealized gains on securities available for sale
 
$
19,795

 
Realized gains on investment securities available for sale, net
 
 
(4,553
)
 
Income taxes
 
 
$
15,242

 

 
 
 
 
 
Amortization of defined benefit pension items
 
 
 
 
Actuarial losses
 
$
(6,264
)
 
Other
 
 
1,441

 
Income taxes
 
 
$
(4,823
)
 

Total reclassifications for the period
 
$
10,419

 
 
 
 
 
 
 
 
 
Three months ended March 31, 2019
Details about accumulated other comprehensive income (loss)
 
Amounts reclassified from accumulated other comprehensive income (loss)
 
Affected line item in the statement where net income is presented
Amortization of unrealized losses on securities available for sale transferred to held to maturity
 
$
(5,962
)
 
Net interest income
 
 
1,371

 
Income taxes
 
 
$
(4,591
)
 

 
 
 
 
 
Amortization of defined benefit pension items
 
 
 
 
Prior service costs
 
$
(14
)
 
Salaries and wages
Actuarial losses
 
(2,741
)
 
Other
 
 
(2,755
)
 
Income before income taxes
 
 
634

 
Income taxes
 
 
$
(2,121
)
 

Total reclassifications for the period
 
$
(6,712
)