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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [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 three and nine month periods ended September 30, 2018 and 2017:
 
 
Unrealized Gains and Losses on Available-for-Sale Securities (1)
 
Unrealized Gains and Losses on Pension Plan Liability (1)
 
Total (1)
Three months ended September 30, 2018
 
(in thousands)
Beginning balance
 
$
(53,597
)
 
$
(2,324
)
 
$
(55,921
)
Other comprehensive loss before reclassifications
 
(14,149
)
 
—

 
(14,149
)
Amounts reclassified from accumulated other comprehensive loss
 
—

 
61

 
61

Net current-period other comprehensive income (loss)
 
(14,149
)
 
61

 
(14,088
)
Ending balance
 
$
(67,746
)
 
$
(2,263
)
 
$
(70,009
)
Three months ended September 30, 2017
 
 
 
 
 
 
Beginning balance
 
$
(4,969
)
 
$
(1,559
)
 
$
(6,528
)
Other comprehensive income before reclassifications
 
549

 
—

 
549

Amounts reclassified from accumulated other comprehensive loss
 
—

 
46

 
46

Net current-period other comprehensive income
 
549

 
46

 
595

Ending balance
 
$
(4,420
)
 
$
(1,513
)
 
$
(5,933
)
Nine months ended September 30, 2018
 
 
 
 
 
 
Beginning balance
 
$
(19,779
)
 
$
(2,446
)
 
$
(22,225
)
Adjustment pursuant to adoption of ASU 2016-01
 
157

 
—

 
157

Other comprehensive loss before reclassifications
 
(48,043
)
 
—

 
(48,043
)
Amounts reclassified from accumulated other comprehensive loss
 
(81
)
 
183

 
102

Net current-period other comprehensive income (loss)
 
(48,124
)
 
183

 
(47,941
)
Ending balance
 
$
(67,746
)
 
$
(2,263
)
 
$
(70,009
)
Nine months ended September 30, 2017
 
 
 
 
 
 
Beginning balance
 
$
(12,704
)
 
$
(6,295
)
 
$
(18,999
)
Other comprehensive income before reclassifications
 
8,284

 
4,604

 
12,888

Amounts reclassified from accumulated other comprehensive loss
 
—

 
178

 
178

Net current-period other comprehensive income
 
8,284

 
4,782

 
13,066

Ending balance
 
$
(4,420
)
 
$
(1,513
)
 
$
(5,933
)
__________
(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
Schedule of reclassifications from accumulated other comprehensive income [Table Text Block]
The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the three and nine month periods ended September 30, 2018 and 2017:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
 
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Affected line Item in the Consolidated
 
 
2018
 
2017
 
2018
 
2017
 
Statement of Income
 
 
(in thousands)
 
 
Unrealized gains and losses on available-for-sale debt securities
 
 
 
 
 
 
 
 
 
 
Investment securities gains, net
 
$
—

 
$
—

 
$
106

 
$
—

 
Investment securities losses, net
 
 
—

 
—

 
106

 
—

 
Total before tax
 
 
—

 
—

 
(25
)
 
—

 
Income tax provision
 
 
$
—

 
$
—

 
$
81

 
$
—

 
Net of tax
 
 
 
 
 
 
 
 
 
 
 
Amortization of pension plan liability
 
 
 
 
 
 
 
 
 
 
Actuarial losses
 
$
(80
)
 
$
(72
)
 
$
(239
)
 
$
(279
)
 
Compensation and employee benefits
 
 
(80
)
 
(72
)
 
(239
)
 
(279
)
 
Total before tax
 
 
19

 
26

 
56

 
101

 
Income tax benefit
 
 
$
(61
)
 
$
(46
)
 
$
(183
)
 
$
(178
)
 
Net of tax