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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table shows changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2017, 2016 and 2015:
 
 
Unrealized Gains and Losses on Available-for-Sale Securities (1)
 
Unrealized Gains and Losses on Pension Plan Liability (1)
 
Total (1)
Year Ended December 31, 2017
 
(in thousands)
Beginning balance
 
$
(12,704
)
 
$
(6,295
)
 
$
(18,999
)
Other comprehensive income (loss) before reclassifications
 
(3,391
)
 
4,017

 
626

Amounts reclassified from accumulated other comprehensive loss (2)
 
7

 
223

 
230

Net current-period other comprehensive income (loss)
 
(3,384
)
 
4,240

 
856

Adjustment pursuant to adoption of ASU 2018-02
 
(3,691
)
 
(391
)
 
(4,082
)
Ending balance
 
$
(19,779
)
 
$
(2,446
)
 
$
(22,225
)
Year Ended December 31, 2016
 
 
 
 
 
 
Beginning balance
 
$
386

 
$
(6,681
)
 
$
(6,295
)
Other comprehensive loss before reclassifications
 
(12,338
)
 
(39
)
 
(12,377
)
Amounts reclassified from accumulated other comprehensive loss (2)
 
(752
)
 
425

 
(327
)
Net current-period other comprehensive income (loss)
 
(13,090
)
 
386

 
(12,704
)
Ending balance
 
$
(12,704
)
 
$
(6,295
)
 
$
(18,999
)
Year Ended December 31, 2015
 
 
 
 
 
 
Beginning balance
 
$
7,462

 
$
(1,841
)
 
$
5,621

Other comprehensive loss before reclassifications
 
(6,069
)
 
(5,054
)
 
(11,123
)
Amounts reclassified from accumulated other comprehensive income (2)
 
(1,007
)
 
214

 
(793
)
Net current-period other comprehensive loss
 
(7,076
)
 
(4,840
)
 
(11,916
)
Ending balance
 
$
386

 
$
(6,681
)
 
$
(6,295
)
__________
(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
(2) See following table for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table shows details regarding the reclassifications from accumulated other comprehensive income for the years ended December 31, 2017, 2016 and 2015:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income
 
Affected line Item in the Consolidated Statement of Income
 
 
Years Ended
 
 
 
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
 
 
 
(in thousands)
 
 
Unrealized gains and losses on available-for-sale securities
 
$
(11
)
 
$
1,181

 
$
1,581

 
Investment securities gains (losses), net
 
 
(11
)
 
1,181

 
1,581

 
Total before tax
 
 
4

 
(429
)
 
(574
)
 
Income tax benefit (provision)
 
 
$
(7
)
 
$
752

 
$
1,007

 
Net of tax
 
 
 
 
 
 
 
 
 
Amortization of pension plan liability
actuarial losses
 
$
(350
)
 
$
(668
)
 
$
(336
)
 
Compensation and employee benefits
 
 
(350
)
 
(668
)
 
(336
)
 
Total before tax
 
 
127

 
243

 
122

 
Income tax benefit
 
 
$
(223
)
 
$
(425
)
 
$
(214
)
 
Net of tax