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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 9 Months Ended
Sep. 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:
 
September 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
$
4,113

 
$
5

 
$
—

 
$
4,118

 
$
4,297

 
$
—

 
$
(4
)
 
$
4,293

Mortgage-Backed Securities- Commercial
58,528

 
—

 
(861
)
 
57,667

 
34,444

 
—

 
(561
)
 
33,883

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
318,442

 
367

 
(975
)
 
317,834

 
280,430

 
5

 
(2,527
)
 
277,908

Mortgage-Backed Securities – Commercial
14,226

 
—

 
(4
)
 
14,222

 
14,675

 
—

 
(142
)
 
14,533

Obligations of States and Political Subdivisions
40,572

 
398

 
(129
)
 
40,841

 
38,667

 
55

 
(721
)
 
38,001

Debt Securities Issued by Foreign Governments
200

 
—

 
—

 
200

 
—

 
—

 
—

 
—

Total Securities Held to Maturity
$
436,081

 
$
770

 
$
(1,969
)
 
$
434,882

 
$
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 September 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
3,104

 
3,131

Due after 5 but within 10 years
34,126

 
34,354

Due after 10 years
3,542

 
3,556

 
40,772

 
41,041

Mortgage-Backed Securities (a)
395,309

 
393,841

Total Debt Securities
$
436,081

 
$
434,882

(a)
Mortgage-Backed Securities include an amortized cost of $62.6 million and a fair value of $61.8 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $332.7 million and a fair value of $332.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.