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Investment Securities (Tables)
 9 Months Ended
Sep. 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 September 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 September 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 $202 $— $— $7,200 $6,997 $66 $— $7,063 
6,998 202 — — 7,200 6,997 66 — 7,063 
Residential mortgage-backed securities:
After 5 years to 10 years7,065 286 — — 7,351 9,083 129 — 9,212 
Over 10 years162,754 5,071 — — 167,825 175,972 2,749 (110)178,611 
169,819 5,357 — — 175,176 185,055 2,878 (110)187,823 
Total$176,817 $5,559 $— $— $182,376 $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 years3,645 41 — — 3,686 4,717 23 — 4,740 
After 5 years to 10 years11,387 114 — — 11,501 29,563 292 — 29,855 
15,032 155 — — 15,187 34,280 315 — 34,595 
Residential mortgage-backed securities:
Within 1 year12 — — — 12 304 9 — 313 
After 1 year to 5 years93 2 — — 95 611 3 (1)613 
After 5 years to 10 years2,112 72 — — 2,184 36,893 107 (21)36,979 
Over 10 years77,400 2,041 (61)— 79,380 80,630 378 (453)80,555 
79,617 2,115 (61)— 81,671 118,438 497 (475)118,460 
Collateralized mortgage obligations:
After 5 years to 10 years821 30 — — 851 2,377 6 (22)2,361 
Over 10 years4,982 — (3)— 4,979 — — — — 
5,803 30 (3)— 5,830 2,377 6 (22)2,361 
Corporate bonds:
Within 1 year999 4 — — 1,003 6,012 1 (4)6,009 
After 1 year to 5 years29,751 1,637 (1)(1)31,386 29,606 596 (61)30,141 
After 5 years to 10 years60,000 — (5,159)(691)54,150 — — — — 
Over 10 years— — — — — 60,000 — (4,942)55,058 
90,750 1,641 (5,160)(692)86,539 95,618 597 (5,007)91,208 
Total$191,202 $3,941 $(5,224)$(692)$189,227 $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 nine months ended September 30, 2020 and 2019:
 Nine Months Ended September 30,
(Dollars in thousands)20202019
Securities available-for-sale:
Proceeds from sales$65,621 $24,987 
Gross realized gains on sales831 65 
Gross realized losses on sales14 24 
Tax expense related to net realized gains on sales172 9 
Amount of Securities in Unrealized Loss Position
The following table shows the fair value of securities that were in an unrealized loss position for which an allowance for credit losses has not been recorded at September 30, 2020 and December 31, 2019, by the length of time those securities were in a continuous loss position.
 Less than
Twelve Months		Twelve Months
or Longer		Total
(Dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
At September 30, 2020
Securities Held-to-Maturity
Total$— $— $— $— $— $— 
Securities Available-for-Sale
Residential mortgage-backed securities$8,747 $(60)$32 $(1)$8,779 $(61)
Collateralized mortgage obligations4,979 (3)— — 4,979 (3)
Total$13,726 $(63)$32 $(1)$13,758 $(64)
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 nine months ended September 30, 2020 of the allowance for credit losses on securities available-for-sale.

(Dollars in thousands)Corporate Bonds
Three months ended September 30, 2020
Securities Available-for-Sale
Beginning balance$(855)
Additions for securities for which no previous expected credit losses were recognized(1)
Change in securities for which a previous expected credit loss was recognized164 
Ending balance$(692)
Nine months ended September 30, 2020
Securities Available-for-Sale
Beginning balance$— 
Adjustment to initially apply ASU No. 2016-13 for CECL(300)
Additions for securities for which no previous expected credit losses were recognized(1)
Change in securities for which a previous expected credit loss was recognized(391)
Ending balance$(692)