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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2017
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 six month periods ended June 30, 2017 and 2016:
 
 
Unrealized Gains and Losses on Available-for-Sale Securities (1)
 
Unrealized Gains and Losses on Pension Plan Liability (1)
 
Total (1)
Three months ended June 30, 2017
 
(in thousands)
Beginning balance
 
$
(11,002
)
 
$
(1,604
)
 
$
(12,606
)
Other comprehensive income before reclassifications
 
6,033

 
—

 
6,033

Amounts reclassified from accumulated other comprehensive income
 
—

 
45

 
45

Net current-period other comprehensive income
 
6,033

 
45

 
6,078

Ending balance
 
$
(4,969
)
 
$
(1,559
)
 
$
(6,528
)
Three months ended June 30, 2016
 
 
 
 
 
 
Beginning balance
 
$
18,918

 
$
(6,575
)
 
$
12,343

Other comprehensive income before reclassifications
 
8,508

 
—

 
8,508

Amounts reclassified from accumulated other comprehensive income (loss)
 
(146
)
 
106

 
(40
)
Net current-period other comprehensive income
 
8,362

 
106

 
8,468

Ending balance
 
$
27,280

 
$
(6,469
)
 
$
20,811

Six months ended June 30, 2017
 
 
 
 
 
 
Beginning balance
 
$
(12,704
)
 
$
(6,295
)
 
$
(18,999
)
Other comprehensive income before reclassifications
 
7,735

 
4,604

 
12,339

Amounts reclassified from accumulated other comprehensive income
 
—

 
132

 
132

Net current-period other comprehensive income
 
7,735

 
4,736

 
12,471

Ending balance
 
$
(4,969
)
 
$
(1,559
)
 
$
(6,528
)
Six months ended June 30, 2016
 
 
 
 
 
 
Beginning balance
 
$
386

 
$
(6,681
)
 
$
(6,295
)
Other comprehensive income before reclassifications
 
27,278

 
—

 
27,278

Amounts reclassified from accumulated other comprehensive income (loss)
 
(384
)
 
212

 
(172
)
Net current-period other comprehensive income
 
26,894

 
212

 
27,106

Ending balance
 
$
27,280

 
$
(6,469
)
 
$
20,811

__________
(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 six month periods ended June 30, 2017 and 2016:
 
 
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
 
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
Affected line Item in the Consolidated
 
 
2017
 
2016
 
2017
 
2016
 
Statement of Income
 
 
(in thousands)
 
 
Unrealized gains and losses on available-for-sale securities
 
 
 
 
 
 
 
 
 
 
Investment securities gains
 
$
—

 
$
229

 
$
—

 
$
602

 
Investment securities gains, net
 
 
—

 
229

 
—

 
602

 
Total before tax
 
 
—

 
(83
)
 
—

 
(218
)
 
Income tax provision
 
 
$
—

 
$
146

 
$
—

 
$
384

 
Net of tax
 
 
 
 
 
 
 
 
 
 
 
Amortization of pension plan liability
 
 
 
 
 
 
 
 
 
 
Actuarial losses
 
$
(71
)
 
$
(167
)
 
$
(207
)
 
$
(334
)
 
Compensation and employee benefits
 
 
(71
)
 
(167
)
 
(207
)
 
(334
)
 
Total before tax
 
 
26

 
61

 
75

 
122

 
Income tax benefit
 
 
$
(45
)
 
$
(106
)
 
$
(132
)
 
$
(212
)
 
Net of tax