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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities and Available-for-Sale Securities by Contractual Maturities
The following table shows the amortized cost, the estimated fair value and the allowance for credit losses of the held-to-maturity securities and available-for-sale securities at June 30, 2020 and the amortized cost and the estimated fair value of the held-to-maturity securities and available-for-sale securities at December 31, 2019, by contractual maturity within each type:
 At June 30, 2020At December 31, 2019
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair ValueAmortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Securities Held-to-Maturity
U.S. government corporations and agencies:
After 1 year to 5 years$6,998  $226  $—  $—  $7,224  $6,997  $66  $—  $7,063  
6,998  226  —  —  7,224  6,997  66  —  7,063  
Residential mortgage-backed securities:
After 5 years to 10 years7,810  337  —  —  8,147  9,083  129  —  9,212  
Over 10 years186,895  6,041  —  —  192,936  175,972  2,749  (110) 178,611  
194,705  6,378  —  —  201,083  185,055  2,878  (110) 187,823  
Total$201,703  $6,604  $—  $—  $208,307  $192,052  $2,944  $(110) $194,886  
Securities Available-for-Sale
U.S. government corporations and agencies:
Within 1 year$—  $—  $—  —  $—  $301  $—  $(1) $300  
—  —  —  —  —  301  —  (1) 300  
State and political subdivisions:
After 1 year to 5 years3,644  45  —  —  3,689  4,717  23  —  4,740  
After 5 years to 10 years17,708  181  —  —  17,889  29,563  292  —  29,855  
21,352  226  —  —  21,578  34,280  315  —  34,595  
Residential mortgage-backed securities:
Within 1 year83  4  —  —  87  304  9  —  313  
After 1 year to 5 years121  3  —  —  124  611  3  (1) 613  
After 5 years to 10 years2,362  86  —  —  2,448  36,893  107  (21) 36,979  
Over 10 years75,629  2,184  —  —  77,813  80,630  378  (453) 80,555  
78,195  2,277  —  —  80,472  118,438  497  (475) 118,460  
Collateralized mortgage obligations:
After 5 years to 10 years922  35  —  —  957  2,377  6  (22) 2,361  
Over 10 years5,123  —  —  —  5,123  —  —  —  —  
6,045  35  —  —  6,080  2,377  6  (22) 2,361  
Corporate bonds:
Within 1 year1,000  10  —  —  1,010  6,012  1  (4) 6,009  
After 1 year to 5 years29,340  1,246  (32) (6) 30,548  29,606  596  (61) 30,141  
After 5 years to 10 years40,914  18  (4,257) (509) 36,166  —  —  —  —  
Over 10 years20,000  —  (1,313) (340) 18,347  60,000  —  (4,942) 55,058  
91,254  1,274  (5,602) (855) 86,071  95,618  597  (5,007) 91,208  
Total$196,846  $3,812  $(5,602) $(855) $194,201  $251,014  $1,415  $(5,505) $246,924  
Information Related to Sales of Securities Available-for-Sale
The following table presents information related to sales of securities available-for-sale during the six months ended June 30, 2020 and 2019:
 Six Months Ended June 30,
(Dollars in thousands)20202019
Securities available-for-sale:
Proceeds from sales$63,565  $15,494  
Gross realized gains on sales774  29  
Gross realized losses on sales14  21  
Tax expense related to net realized gains on sales160  2  
Amount of Securities in Unrealized Loss Position
The following table shows the fair value of securities that were in an unrealized loss position for which an allowance for credit losses has not been recorded at June 30, 2020 and December 31, 2019, by the length of time those securities were in a continuous loss position.
 Less than
Twelve Months		Twelve Months
or Longer		Total
(Dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
At June 30, 2020
Securities Held-to-Maturity
Total$—  $—  $—  $—  $—  $—  
Securities Available-for-Sale
Total$—  $—  $—  $—  $—  $—  
At December 31, 2019
Securities Held-to-Maturity
Residential mortgage-backed securities$26,767  $(110) $—  $—  $26,767  $(110) 
Total$26,767  $(110) $—  $—  $26,767  $(110) 
Securities Available-for-Sale
U.S. government corporations and agencies$—  $—  $300  $(1) $300  $(1) 
Residential mortgage-backed securities21,827  (62) 48,672  (413) 70,499  (475) 
Collateralized mortgage obligations—  —  1,295  (22) 1,295  (22) 
Corporate bonds998  —  65,506  (5,007) 66,504  (5,007) 
Total$22,825  $(62) $115,773  $(5,443) $138,598  $(5,505) 
Debt Securities, Available-for-sale, Allowance for Credit Loss
The table below presents a rollforward by major security type for the three and six months ended June 30, 2020 of the allowance for credit losses on securities available-for-sale.
(Dollars in thousands)Corporate Bonds
Three months ended June 30, 2020
Securities Available-for-Sale
Beginning balance$(897) 
Change in securities for which a previous expected credit loss was recognized42  
Ending balance$(855) 
Six months ended June 30, 2020
Securities Available-for-Sale
Beginning balance$—  
Adjustment to initially apply ASU No. 2016-13 for CECL(300) 
Change in securities for which a previous expected credit loss was recognized(555) 
Ending balance$(855)