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SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and estimated fair value of securities available for sale
Amortized cost and estimated fair value of securities available for sale are as follows (in thousands):
 September 30, 2020
 Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Mortgage-backed securities, residential$317,087 $9,385 $204 $326,268 
Obligations of states and political subdivisions40,694 2,566 — 43,260 
Corporate bonds and notes7,000 64 — 7,064 
SBA loan pools19,766 47 105 19,708 
Total$384,547 $12,062 $309 $396,300 

 December 31, 2019
 Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
Mortgage-backed securities, residential$225,029 $1,471 $1,266 $225,234 
Obligations of states and political subdivisions41,265 1,580 — 42,845 
Corporate bonds and notes250 — — 250 
SBA loan pools15,712 95 46 15,761 
Total$282,256 $3,146 $1,312 $284,090 
Amortized cost and estimated fair value of securities held to maturity
Amortized cost and estimated fair value of securities held to maturity are as follows (in thousands):
 September 30, 2020
 Amortized CostUnrecognized GainsUnrecognized LossesEstimated Fair Value
Obligations of states and political subdivisions$409 $— $— $409 
Time deposits with other financial institutions2,638 46 — 2,684 
Total$3,047 $46 $— $3,093 
 December 31, 2019
 Amortized CostUnrecognized GainsUnrecognized LossesEstimated Fair Value
Obligations of states and political subdivisions$1,045 $— $— $1,045 
Time deposits with other financial institutions2,070 24 — 2,094 
Total$3,115 $24 $— $3,139 
Amortized cost and estimated fair value of debt securities by contractual maturity
The amortized cost and estimated fair value of debt securities are shown below by expected maturity.  Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties.  Securities not due at a single maturity date are shown separately (in thousands):
September 30, 2020
Available for SaleHeld to Maturity
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Within one year$— $— $609 $613 
After one, but within five years27,232 28,769 2,438 2,480 
After five, but within ten years19,703 20,755 — — 
After ten years759 800 — — 
47,694 50,324 3,047 3,093 
Mortgage-backed securities, residential317,087 326,268 — — 
SBA loan pools19,766 19,708 — — 
Total$384,547 $396,300 $3,047 $3,093 
Gain (Loss) on Securities
The proceeds from sales and calls of securities resulting in gains or losses for the nine months ended September 30, 2020 and 2019 are listed below (in thousands):
20202019
Proceeds$— $15,200 
Gross gains— 79 
Gross losses— (60)
Tax expense— 5 
Investment securities available for sale in an unrealized loss position
The following tables summarize the investment securities available for sale with unrealized losses at September 30, 2020 and December 31, 2019 by aggregated major security type and length of time in a continuous unrealized loss position (in thousands):
 Less than 12 months12 months or longerTotal
September 30, 2020Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Mortgage-backed securities, residential$77,898 $202 $1,056 $2 $78,954 $204 
SBA loan pools8,657 56 3,665 49 12,322 105 
Total temporarily impaired securities$86,555 $258 $4,721 $51 $91,276 $309 
 Less than 12 months12 months or longerTotal
December 31, 2019Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Mortgage-backed securities, residential$71,506 $791 $54,343 $475 $125,849 $1,266 
SBA loan pools3,014 9 1,405 37 4,419 46 
Total temporarily impaired securities$74,520 $800 $55,748 $512 $130,268 $1,312