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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss) The related tax effects allocated to other comprehensive income and accumulated other comprehensive income (loss) are as follows:

 
 
December 31, 2019
 
 
Total other comprehensive income (loss)
 
Total accumulated
other comprehensive income (loss)
(Dollars in thousands)
 
Prior to
reclass
 
Reclass
from
 
Pre-tax
 
Tax effect
 
Net of tax
 
Beginning balance
 
Net activity
 
Cumulative effect of new standard
 
Ending balance
Unrealized gain (loss) on debt securities
 
$
65,858

 
$
(370
)
 
$
66,228

 
$
(14,269
)
 
$
51,959

 
$
(11,601
)
 
$
51,959

 
$
906

 
$
41,264

Unrealized gain (loss) on derivatives
 
281

 
0

 
281

 
(64
)
 
217

 
(217
)
 
217

 
0

 
0

Retirement obligation
 
4,630

 
(1,390
)
 
6,020

 
(1,371
)
 
4,649

 
(32,590
)
 
4,649

 
0

 
(27,941
)
Total
 
$
70,769

 
$
(1,760
)
 
$
72,529

 
$
(15,704
)
 
$
56,825

 
$
(44,408
)
 
$
56,825

 
$
906

 
$
13,323


 
 
December 31, 2018
 
 
Total other comprehensive income (loss)
 
Total accumulated other
comprehensive income (loss)
(Dollars in thousands)
 
Prior to
reclass
 
Reclass
from
 
Pre-tax
 
Tax-effect
 
Net of tax
 
Beginning Balance
 
Net Activity
 
Cumulative effect of new standard
 
Ending Balance
Unrealized gain (loss) on debt securities
 
$
(14,461
)
 
$
(161
)
 
$
(14,300
)
 
$
3,071

 
$
(11,229
)
 
$
(182
)
 
$
(11,229
)
 
$
(190
)
 
$
(11,601
)
Unrealized gain (loss) on derivatives
 
628

 
0

 
628

 
(144
)
 
484

 
(577
)
 
484

 
(124
)
 
(217
)
Retirement obligation
 
(12,319
)
 
(1,775
)
 
(10,544
)
 
2,364

 
(8,180
)
 
(19,631
)
 
(8,180
)
 
(4,779
)
 
(32,590
)
Total
 
$
(26,152
)
 
$
(1,936
)
 
$
(24,216
)
 
$
5,291

 
$
(18,925
)
 
$
(20,390
)
 
$
(18,925
)
 
$
(5,093
)
 
$
(44,408
)

 
 
December 31, 2017
 
 
Total other comprehensive income (loss)
 
Total accumulated other
comprehensive income (loss)
(Dollars in thousands)
 
Prior to
reclass
 
Reclass
from
 
Pre-tax
 
Tax-effect
 
Net of tax
 
Beginning Balance
 
Net Activity
 
Ending Balance
Unrealized gain (loss) on debt securities
 
$
8,447

 
$
1,649

 
$
6,798

 
$
(2,431
)
 
$
4,367

 
$
(4,549
)
 
$
4,367

 
$
(182
)
Unrealized gain (loss) on derivatives
 
810

 
0

 
810

 
(296
)
 
514

 
(1,091
)
 
514

 
(577
)
Retirement obligation
 
2,775

 
(1,511
)
 
4,286

 
(1,114
)
 
3,172

 
(22,803
)
 
3,172

 
(19,631
)
Total
 
$
12,032

 
$
138

 
$
11,894

 
$
(3,841
)
 
$
8,053

 
$
(28,443
)
 
$
8,053

 
$
(20,390
)
Other Accumulated Comprehensive income reclassified from AOCI [Table Text Block]
The following table details the activity reclassified from accumulated other comprehensive income into income during the period:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income (1)
 
 
 
 
December 31,
 
 
(Dollars in thousands)
 
2019
 
2018
 
2017
 
Affected Line Item in the Consolidated Statements of Income
Realized gains and losses on securities available-for-sale
 
$
(370
)
 
$
(161
)
 
$
1,649

 
Net gain (loss) on sales of investment securities
Defined benefit pension plan
 
 
 
 
 
 
 
 
Amortization of prior service cost (2)
 
413

 
413

 
413

 
Other noninterest expense
Recognized net actuarial loss (2)
 
(1,803
)
 
(2,188
)
 
(1,924
)
 
Other noninterest expense
Amortization and settlement charges of defined benefit pension items
 
(1,390
)
 
(1,775
)
 
(1,511
)
 
 
Total reclassifications for the period, before tax
 
$
(1,760
)
 
$
(1,936
)
 
$
138

 
 

(1) Negative amounts are debits to profit/loss.
(2) Included in the computation of net periodic pension cost (see Note 16 - Employee Benefit Plans for additional details).