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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]  
Held-to-maturity Securities [Table Text Block]
Below is an analysis of the amortized cost and fair values of debt securities held to maturity at:
 
June 30, 2017
 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
(dollars in thousands)
Obligations of U.S. Government Agencies:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
$
4,142

 
$
—

 
$
(13
)
 
$
4,129

 
$
4,297

 
$
—

 
$
(4
)
 
$
4,293

Mortgage-Backed Securities- Commercial
58,780

 
—

 
(727
)
 
58,053

 
34,444

 
—

 
(561
)
 
33,883

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
332,768

 
193

 
(1,527
)
 
331,434

 
280,430

 
5

 
(2,527
)
 
277,908

Mortgage-Backed Securities – Commercial
14,393

 
22

 
—

 
14,415

 
14,675

 
—

 
(142
)
 
14,533

Obligations of States and Political Subdivisions
40,603

 
431

 
(138
)
 
40,896

 
38,667

 
55

 
(721
)
 
38,001

Debt Securities Issued by Foreign Governments
200

 
—

 
—

 
200

 
—

 
—

 
—

 
—

Total Securities Held to Maturity
$
450,886

 
$
646

 
$
(2,405
)
 
$
449,127

 
$
372,513

 
$
60

 
$
(3,955
)
 
$
368,618
Schedule of Held-to-Maturity Securities by Maturity [Table Text Block]
The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
—

 
$
—

Due after 1 but within 5 years
3,118

 
3,142

Due after 5 but within 10 years
32,061

 
32,354

Due after 10 years
5,624

 
5,600

 
40,803

 
41,096

Mortgage-Backed Securities (a)
410,083

 
408,031

Total Debt Securities
$
450,886

 
$
449,127

(a)
Mortgage-Backed Securities include an amortized cost of $62.9 million and a fair value of $62.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $347.2 million and a fair value of $345.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.