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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The amortized cost and estimated fair value of securities available for sale along with gross unrealized gains and losses are summarized as follows:
(dollars in thousands)
March 31, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Securities Available for Sale:
State, county & municipal securities$6,296  $135  $(21) $6,410  
Corporate debt securities2,007  10  —  2,017  
Mortgage-backed securities318,115  7,933  (1,390) 324,658  
$326,418  $8,078  $(1,411) $333,085  

(dollars in thousands)
December 31, 2019Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Securities Available for Sale:
State, county & municipal securities$5,133  $36  $(54) $5,115  
Corporate debt securities2,811  11  (16) 2,806  
Mortgage-backed securities338,930  2,669  (2,188) 339,411  
$346,874  $2,716  $(2,258) $347,332  
Investments Classified by Contractual Maturity Date This is often the case with mortgage-backed securities, which are disclosed separately in the table below.
Securities Available for Sale
(dollars in thousands)Amortized CostFair Value
Due in one year or less$145  $147  
Due after one year through five years3,633  3,640  
Due after five years through ten years723  761  
Due after ten years3,802  3,879  
$8,303  $8,427  
Mortgage-backed securities318,115  324,658  
$326,418  $333,085  
Schedule of Unrealized Loss on Investments
Information pertaining to securities with gross unrealized losses at March 31, 2020 and December 31, 2019 aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
Less Than 12 Months12 Months or GreaterTotal
(dollars in thousands)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
March 31, 2020
State, county & municipal securities$1,352  $(21) $—  $—  $1,352  $(21) 
Corporate debt securities—  —  —  —  —  —  
Mortgage-backed securities17,829  (349) 18,403  (1,041) 36,232  (1,390) 
$19,181  $(370) $18,403  $(1,041) $37,584  $(1,411) 
December 31, 2019
State, county & municipal securities$3,257  $(54) $—  $—  $3,257  $(54) 
Corporate debt securities—  —  784  (16) 784  (16) 
Mortgage-backed securities60,860  (277) 119,110  (1,911) 179,970  (2,188) 
$64,117  $(331) $119,894  $(1,927) $184,011  $(2,258)