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OTHER COMPREHENSIVE INCOME (LOSS): (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes, net of tax within each classification of accumulated other comprehensive income for the years ended December 31, 2017 and 2016.
 
 
Unrealized
 
 
 
 
 
 
gains and
 
2017
 
 
Losses on
available-
for-sale
 
Retirement
 
 
(Dollar amounts in thousands)
 
Securities
 
plans
 
Total
Beginning balance, January 1
 
$
(1,077
)
 
$
(13,087
)
 
$
(14,164
)
Change in other comprehensive income before reclassification
 
3,371

 
(4,609
)
 
(1,238
)
Amounts reclassified from accumulated other comprehensive income
 
(36
)
 
734

 
698

Net current period other comprehensive income (loss)
 
3,335

 
(3,875
)
 
(540
)
Ending balance, December 31
 
$
2,258

 
$
(16,962
)
 
$
(14,704
)


 
 
Unrealized
 
 
 
 
 
 
gains and
 
2016
 
 
Losses on
available-
for-sale
 
Retirement
 
 
(Dollar amounts in thousands)
 
Securities
 
plans
 
Total
Beginning balance, January 1
 
$
9,053

 
$
(18,454
)
 
$
(9,401
)
Change in other comprehensive income before reclassification
 
(10,109
)
 
4,151

 
(5,958
)
Amounts reclassified from accumulated other comprehensive income
 
(21
)
 
1,216

 
1,195

Net current period other comprehensive income (loss)
 
(10,130
)
 
5,367

 
(4,763
)
Ending balance, December 31
 
$
(1,077
)
 
$
(13,087
)
 
$
(14,164
)

 
 
Balance
at
 
Current
Period
 
Balance
at
(Dollar amounts in thousands)
 
1/1/2017
 
Change
 
12/31/2017
Unrealized gains (losses) on securities available-for-sale
 
 
 
 
 
 
without other than temporary impairment
 
$
(3,018
)
 
$
1,647

 
$
(1,371
)
Unrealized gains (losses) on securities available-for-sale
 
 

 
 

 
 

with other than temporary impairment
 
1,941

 
1,688

 
3,629

Total unrealized gain (loss) on securities available-for-sale
 
$
(1,077
)
 
$
3,335

 
$
2,258

Unrealized loss on retirement plans
 
(13,087
)
 
(3,875
)
 
(16,962
)
TOTAL
 
$
(14,164
)
 
$
(540
)
 
$
(14,704
)
 
 
 
Balance
at
 
Current
Period
 
Balance
at
(Dollar amounts in thousands)
 
1/1/2016
 
Change
 
12/31/2016
Unrealized gains (losses) on securities available-for-sale
 
 

 
 

 
 

without other than temporary impairment
 
$
5,855

 
$
(8,873
)
 
$
(3,018
)
Unrealized gains (losses) on securities available-for-sale
 
 

 
 

 
 

with other than temporary impairment
 
3,198

 
(1,257
)
 
1,941

Total unrealized gain (loss) on securities available-for-sale
 
$
9,053

 
$
(10,130
)
 
$
(1,077
)
Unrealized loss on retirement plans
 
(18,454
)
 
5,367

 
(13,087
)
TOTAL
 
$
(9,401
)
 
$
(4,763
)
 
$
(14,164
)
Reclassification out of Accumulated Other Comprehensive Income
 
 
Balance at December 31, 2017
 
 
Details about accumulated
 
Amount reclassified from
 
Affected line item in
other comprehensive
 
accumulated other
 
the statement where
income components
 
comprehensive income
 
net income is presented
 
 
(in thousands)
 
 
Unrealized gains and losses
 
$
59

 
Net securities gains (losses)
on available-for-sale
 
(23
)
 
Income tax expense
securities
 
$
36

 
Net of tax
 
 
 
 
 
Amortization of
 
$
(1,204
)
 
(a)
retirement plan items
 
470

 
Income tax expense
 
 
$
(734
)
 
Net of tax
Total reclassifications for the period
 
$
(698
)
 
Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).

 
 
Balance at December 31, 2016
 
 
Details about accumulated
 
Amount reclassified from
 
Affected line item in
other comprehensive
 
accumulated other
 
the statement where
income components
 
comprehensive income
 
net income is presented
 
 
(in thousands)
 
 
Unrealized gains and losses
 
$
34

 
Net securities gains (losses)
on available-for-sale
 
(13
)
 
Income tax expense
securities
 
$
21

 
Net of tax
 
 
 
 
 
Amortization of
 
$
(1,992
)
 
(a)
retirement plan items
 
776

 
Income tax expense
 
 
$
(1,216
)
 
Net of tax
Total reclassifications for the period
 
$
(1,195
)
 
Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).

 
 
Balance at December 31, 2015
 
 
Details about accumulated
 
Amount reclassified from
 
Affected line item in
other comprehensive
 
accumulated other
 
the statement where
income components
 
comprehensive income
 
net income is presented
 
 
(in thousands)
 
 
Unrealized gains and losses
 
$
17

 
Net securities gains (losses)
on available-for-sale
 
(6
)
 
Income tax expense
securities
 
$
11

 
Net of tax
 
 
 
 
 
Amortization of
 
$
(8,066
)
 
(a)
retirement plan items
 
3,146

 
Income tax expense
 
 
$
(4,920
)
 
Net of tax
Total reclassifications for the period
 
$
(4,909
)
 
Net of tax
(a) Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 15 for additional details).