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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2020
Schedule of Held-to-maturity Securities [Line Items]  
Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale
Below is an analysis of the amortized cost and estimated fair values of securities available for sale 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$6,778 $763 $— $7,541 $7,745 $596 $— $8,341 
Mortgage-Backed Securities – Commercial209,175 9,377 — 218,552 186,316 2,983 (166)189,133 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential527,570 15,977 (4)543,543 660,777 4,113 (2,943)661,947 
Other Government-Sponsored Enterprises100,993 2 (2)100,993 1,000 — — 1,000 
Obligations of States and Political Subdivisions12,965 208 (6)13,167 17,738 171 — 17,909 
Corporate Securities22,935 1,505 — 24,440 22,919 1,043 — 23,962 
Total Securities Available for Sale$880,416 $27,832 $(12)$908,236 $896,495 $8,906 $(3,109)$902,292 
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale
The amortized cost and estimated fair value of debt securities available for sale at September 30, 2020, by contractual maturity, are shown below.
Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due within 1 year$104,991 $105,041 
Due after 1 but within 5 years20,225 21,260 
Due after 5 but within 10 years7,127 7,749 
Due after 10 years4,550 4,550 
136,893 138,600 
Mortgage-Backed Securities (a)743,523 769,636 
Total Debt Securities$880,416 $908,236 
 
(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 $216.0 million and a fair value of $226.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $527.6 million and a fair value of $543.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac 		[1]
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale
Proceeds from sales, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the nine months ended September 30:
20202019
 (dollars in thousands)
Proceeds from sales$— $— 
Gross gains (losses) realized:
Sales transactions:
Gross gains$— $— 
Gross losses— — 
— — 
Maturities
Gross gains47 15 
Gross losses— — 
47 15 
Net gains and impairment$47 $15 
[1] 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.