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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
As of the balance sheet dates, the components of Accumulated OCI, net of tax, were:
 
September 30,
2017
December 31,
2016
 
(Dollars in thousands)
Net unrealized loss on investment securities available-for-sale
$
(77
)
$
(664
)
Defined benefit pension plan net unrealized actuarial loss
(2,615
)
(2,615
)
Total
$
(2,692
)
$
(3,279
)
Schedule of Comprehensive Income (Loss) [Table Text Block]
The following tables disclose the tax effects allocated to each component of OCI for the three and nine months ended September 30:
 
Three Months Ended
 
September 30, 2017
September 30, 2016
 
Before-Tax Amount
Tax (Expense) Benefit
Net-of-Tax Amount
Before-Tax Amount
Tax (Expense) Benefit
Net-of-Tax Amount
 
(Dollars in thousands)
Investment securities available-for-sale:
 
 
 
 
 
 
Net unrealized holding gains (losses) arising during the period on investment securities available-for-sale
$
70

$
(24
)
$
46

$
(276
)
$
94

$
(182
)
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income
(24
)
8

(16
)
(53
)
18

(35
)
Total other comprehensive income (loss)
$
46

$
(16
)
$
30

$
(329
)
$
112

$
(217
)

 
Nine Months Ended
 
September 30, 2017
September 30, 2016
 
Before-Tax Amount
Tax (Expense) Benefit
Net-of-Tax Amount
Before-Tax Amount
Tax (Expense) Benefit
Net-of-Tax Amount
 
(Dollars in thousands)
Investment securities available-for-sale:
 
 
 
 
 
 
Net unrealized holding gains arising during the period on investment securities available-for-sale
$
923

$
(314
)
$
609

$
1,082

$
(368
)
$
714

Reclassification adjustment for net gains on investment securities available-for-sale realized in net income
(33
)
11

(22
)
(71
)
24

(47
)
Total other comprehensive income
$
890

$
(303
)
$
587

$
1,011

$
(344
)
$
667
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table discloses information concerning the reclassification adjustments from OCI for the three and nine months ended September 30, 2017 and 2016.
 
Three Months Ended
Nine Months Ended
 
Reclassification Adjustment Description
September 30, 2017
September 30, 2016
September 30, 2017
September 30, 2016
Affected Line Item in
Consolidated Statement of Income
 
(Dollars in thousands)
 
Investment securities available-for-sale:
 
 
 
 
Net gains on investment securities available-for-sale
$
(24
)
$
(53
)
$
(33
)
$
(71
)
Net gains on sales of investment securities available-for-sale
Tax benefit
8

18

11

24

Provision for income taxes
Total reclassifications
$
(16
)
$
(35
)
$
(22
)
$
(47
)
Net income