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Investments - (Tables)
6 Months Ended
Jun. 30, 2020
Investments [Abstract]  
Schedule of major components of securities available for sale and comparison of amortized cost, estimated fair market values, and gross unrealized gains and losses
The following table sets forth the major components of securities available for sale and compares the amortized costs and estimated fair market values of, and the gross unrealized gains and losses on, these securities at June 30, 2020 and December 31, 2019:
(Dollars in thousands)June 30, 2020December 31, 2019
Amortized
Cost
Gross UnrealizedEstimated
Fair Value
Amortized
Cost
Gross UnrealizedEstimated
Fair Value
GainLossGainLoss
Securities Available for Sale
Commercial mortgage backed securities issued by U.S. Agencies(1)
$8,537  $416  $—  $8,953  $9,147  $128  $(46) $9,229  
Residential mortgage backed securities issued by U.S. Agencies(2)
16,883  380  (3) 17,260  19,380  12  (277) 19,115  
Total$25,420  $796  $(3) $26,213  $28,527  $140  $(323) $28,344  
 
(1)Secured by first liens on commercial apartment building mortgages.
(2)Secured by closed-end first liens on 1-4 family residential mortgages.
Schedule of amortized cost and estimated fair values of securities available for sale by contractual maturities and historical prepayments based on prior twelve months of principal payments
The amortized cost and estimated fair values of securities available for sale at June 30, 2020 and December 31, 2019 are shown in the tables below by contractual maturities taking into consideration historical prepayments based on the prior twelve months of principal payments. Expected maturities will differ from contractual maturities and historical prepayments, particularly with respect to collateralized mortgage obligations, primarily because prepayment rates are affected by changes in conditions in the interest rate market and, therefore, future prepayment rates may differ from historical prepayment rates.
 At June 30, 2020 Maturing in
(Dollars in thousands)One year
or less
Over one
year through
five years
Over five
years through
ten years
Over ten
Years
Total
Securities available for sale, amortized cost$5,379  $12,570  $7,471  $—  $25,420  
Securities available for sale, estimated fair value5,465  12,880  7,868  —  26,213  
Weighted average yield1.42 %1.51 %1.92 %— %1.61 %

 At December 31, 2019 Maturing in
(Dollars in thousands)One year
or less
Over one
year through
five years
Over five
years through
ten years
Over ten
Years
Total
Securities available for sale, amortized cost$5,286  $13,032  $6,842  $3,367  $28,527  
Securities available for sale, estimated fair value5,230  12,887  6,849  3,378  28,344  
Weighted average yield1.58 %1.66 %2.22 %2.53 %1.88 %
Schedule of gross unrealized losses and fair values of investments
The tables below indicate, as of June 30, 2020 and December 31, 2019, the gross unrealized losses and fair values of our investments, aggregated by investment category, and length of time that the individual securities have been in a continuous unrealized loss position.
 Securities with Unrealized Loss at June 30, 2020
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Commercial mortgage backed securities issued by U.S. Agencies$43  $—  $164  $(3) $207  $(3) 
Total$43  $—  $164  $(3) $207  $(3) 
  
Securities with Unrealized Loss at December 31, 2019
 Less than 12 months12 months or moreTotal
(Dollars in thousands)Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Commercial mortgage backed securities issued by U.S. Agencies4,472  (46) —  —  4,472  (46) 
Residential mortgage backed securities issued by U.S. Agencies76  (1) 15,965  (276) 16,041  (277) 
Total$4,548  $(47) $15,965  $(276) $20,513  $(323) 
Schedule of other investments As of June 30, 2020 and December 31, 2019, our equity investments without readily determinable fair value were as follows:
June 30, 2020December 31, 2019
(Dollars in thousands)
Equity investments without readily determinable fair value$2,316  $2,117