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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
 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$2,937 $151 $— $3,088 $3,392 $57 $— $3,449 
Mortgage-Backed Securities- Commercial41,334 1,537 — 42,871 51,291 18 (184)51,125 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential171,100 5,646 (19)176,727 229,667 1,377 (294)230,750 
Mortgage-Backed Securities – Commercial10,334 375 — 10,709 12,081 67 — 12,148 
Obligations of States and Political Subdivisions42,133 661 (1)42,793 40,092 554 — 40,646 
Debt Securities Issued by Foreign Governments800 — — 800 600 — — 600 
Total Securities Held to Maturity$268,638 $8,370 $(20)$276,988 $337,123 $2,073 $(478)$338,718 
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, 2020, 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$4,949 $4,974 
Due after 1 but within 5 years11,195 11,310 
Due after 5 but within 10 years19,760 20,232 
Due after 10 years7,029 7,077 
42,933 43,593 
Mortgage-Backed Securities (a)225,705 233,395 
Total Debt Securities$268,638 $276,988 
(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 $44.3 million and a fair value of $46.0 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $181.4 million and a fair value of $187.4 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.