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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Schedule of Held-to-maturity Securities [Line Items]  
Debt Securities, Held-to-maturity [Table Text Block]
Below is an analysis of the amortized cost and fair values of debt securities held to maturity at:
 
September 30, 2019
 
December 31, 2018
 
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
$
3,549

 
$
57

 
$
—

 
$
3,606

 
$
3,635

 
$
—

 
$
(97
)
 
$
3,538

Mortgage-Backed Securities- Commercial
54,244

 
173

 
(106
)
 
54,311

 
55,221

 
—

 
(2,327
)
 
52,894

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
245,238

 
1,762

 
(297
)
 
246,703

 
279,109

 
212

 
(7,254
)
 
272,067

Mortgage-Backed Securities – Commercial
12,361

 
123

 
—

 
12,484

 
13,159

 
—

 
(258
)
 
12,901

Obligations of States and Political Subdivisions
41,898

 
626

 
—

 
42,524

 
42,331

 
175

 
(313
)
 
42,193

Debt Securities Issued by Foreign Governments
600

 
—

 
(4
)
 
596

 
400

 
—

 
—

 
400

Total Securities Held to Maturity
$
357,890

 
$
2,741

 
$
(407
)
 
$
360,224

 
$
393,855

 
$
387

 
$
(10,249
)
 
$
383,993
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, 2019, 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
$
512

 
$
512

Due after 1 but within 5 years
8,084

 
8,144

Due after 5 but within 10 years
33,902

 
34,464

Due after 10 years
—

 
—

 
42,498

 
43,120

Mortgage-Backed Securities (a)
315,392

 
317,104

Total Debt Securities
$
357,890

 
$
360,224

(a)
Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $57.8 million and a fair value of $57.9 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $257.6 million and a fair value of $259.2 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.