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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 3 Months Ended
Mar. 31, 2018
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:
 
March 31, 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
$
3,895

 
$
—

 
$
(109
)
 
$
3,786

 
$
3,925

 
$
—

 
$
(14
)
 
$
3,911

Mortgage-Backed Securities- Commercial
57,762

 
—

 
(2,224
)
 
55,538

 
58,249

 
—

 
(1,394
)
 
56,855

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
294,205

 
—

 
(7,645
)
 
286,560

 
305,126

 
10

 
(2,552
)
 
302,584

Mortgage-Backed Securities – Commercial
13,859

 
—

 
(299
)
 
13,560

 
14,056

 
—

 
(71
)
 
13,985

Obligations of States and Political Subdivisions
40,509

 
38

 
(660
)
 
39,887

 
40,540

 
335

 
(161
)
 
40,714

Debt Securities Issued by Foreign Governments
200

 
—

 
(3
)
 
197

 
200

 
—

 
—

 
200

Total Securities Held to Maturity
$
410,430

 
$
38

 
$
(10,940
)
 
$
399,528

 
$
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 March 31, 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
$
87

 
$
86

Due after 1 but within 5 years
3,646

 
3,626

Due after 5 but within 10 years
35,350

 
34,764

Due after 10 years
1,626

 
1,608

 
40,709

 
40,084

Mortgage-Backed Securities (a)
369,721

 
359,444

Total Debt Securities
$
410,430

 
$
399,528

(a)
Mortgage-Backed Securities include an amortized cost of $61.7 million and a fair value of $59.3 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $308.1 million and a fair value of $300.1 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.