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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 6 Months Ended
Jun. 30, 2018
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:
 
June 30, 2018
 
December 31, 2017
 
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
$
3,867

 
$
—

 
$
(128
)
 
$
3,739

 
$
3,925

 
$
—

 
$
(14
)
 
$
3,911

Mortgage-Backed Securities- Commercial
56,991

 
—

 
(2,509
)
 
54,482

 
58,249

 
—

 
(1,394
)
 
56,855

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
285,624

 
—

 
(9,241
)
 
276,383

 
305,126

 
10

 
(2,552
)
 
302,584

Mortgage-Backed Securities – Commercial
13,659

 
—

 
(369
)
 
13,290

 
14,056

 
—

 
(71
)
 
13,985

Obligations of States and Political Subdivisions
42,478

 
60

 
(655
)
 
41,883

 
40,540

 
335

 
(161
)
 
40,714

Debt Securities Issued by Foreign Governments
400

 
—

 
(9
)
 
391

 
200

 
—

 
—

 
200

Total Securities Held to Maturity
$
403,019

 
$
60

 
$
(12,911
)
 
$
390,168

 
$
422,096

 
$
345

 
$
(4,192
)
 
$
418,249
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, 2018, 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
$
86

 
$
86

Due after 1 but within 5 years
3,830

 
3,807

Due after 5 but within 10 years
37,340

 
36,775

Due after 10 years
1,622

 
1,606

 
42,878

 
42,274

Mortgage-Backed Securities (a)
360,141

 
347,894

Total Debt Securities
$
403,019

 
$
390,168

(a)
Mortgage-Backed Securities include an amortized cost of $60.9 million and a fair value of $58.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $299.2 million and a fair value of $289.7 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.