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Investment Securities Maturity of Held-to-Maturity Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 March 31, 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$3,298  $164  $—  $3,462  $3,392  $57  $—  $3,449  
Mortgage-Backed Securities- Commercial48,554  512  —  49,066  51,291  18  (184) 51,125  
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential216,547  7,712  —  224,259  229,667  1,377  (294) 230,750  
Mortgage-Backed Securities – Commercial11,793  417  —  12,210  12,081  67  —  12,148  
Obligations of States and Political Subdivisions37,464  531  —  37,995  40,092  554  —  40,646  
Debt Securities Issued by Foreign Governments600  —  —  600  600  —  —  600  
Total Securities Held to Maturity$318,256  $9,336  $—  $327,592  $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 March 31, 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$1,019  $1,023  
Due after 1 but within 5 years10,428  10,533  
Due after 5 but within 10 years26,617  27,039  
Due after 10 years—  —  
38,064  38,595  
Mortgage-Backed Securities (a)280,192  288,997  
Total Debt Securities$318,256  $327,592  
(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 $51.9 million and a fair value of $52.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $228.3 million and a fair value of $236.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.