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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 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 Maturity
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 December 31, 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 December 31, 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 $171 $— — $7,169 $6,997 $66 $— $7,063 
6,998 171 — — 7,169 6,997 66 — 7,063 
Residential mortgage-backed securities:
After 5 years to 10 years6,325 253 — — 6,578 9,083 129 — 9,212 
Over 10 years137,934 4,644 — — 142,578 175,972 2,749 (110)178,611 
144,259 4,897 — — 149,156 185,055 2,878 (110)187,823 
Total$151,257 $5,068 $— $— $156,325 $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 years3,560 33 — — 3,593 4,717 23 — 4,740 
After 5 years to 10 years9,881 63 — — 9,944 29,563 292 — 29,855 
13,441 96 — — 13,537 34,280 315 — 34,595 
Residential mortgage-backed securities:
Within 1 year— — — — — 304 9 — 313 
After 1 year to 5 years323 10 — — 333 611 3 (1)613 
After 5 years to 10 years1,664 58 — — 1,722 36,893 107 (21)36,979 
Over 10 years110,018 2,153 (63)— 112,108 80,630 378 (453)80,555 
112,005 2,221 (63)— 114,163 118,438 497 (475)118,460 
Collateralized mortgage obligations:
After 5 years to 10 years754 21 — — 775 2,377 6 (22)2,361 
Over 10 years4,561 — (15)— 4,546 — — — — 
5,315 21 (15)— 5,321 2,377 6 (22)2,361 
Corporate bonds:
Within 1 year499 2 — — 501 6,012 1 (4)6,009 
After 1 year to 5 years29,498 1,440 — (16)30,922 29,606 596 (61)30,141 
After 5 years to 10 years60,496 3 (5,450)(853)54,196 — — — — 
Over 10 years— — — — — 60,000 — (4,942)55,058 
90,493 1,445 (5,450)(869)85,619 95,618 597 (5,007)91,208 
Total$221,254 $3,783 $(5,528)$(869)$218,640 $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 years ended December 31, 2020, 2019 and 2018:
 For the Years Ended December 31,
(Dollars in thousands)202020192018
Securities available-for-sale:
Proceeds from sales$66,421 $26,494 $1,010 
Gross realized gains on sales885 78 10 
Gross realized losses on sales14 24 — 
Tax expense related to net realized gains on sales183 11 2 
Schedule of Securities in Unrealized Loss Position
The following table shows the fair value of securities that were in an unrealized loss position for which an allowance for credit losses has not been recorded at December 31, 2020 and 2019, by the length of time those securities were in a continuous loss position.
 Less than
Twelve Months		Twelve Months
or Longer		Total
(Dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
At December 31, 2020
Securities Held-to-Maturity
Total$— $— $— $— $— $— 
Securities Available-for-Sale
Residential mortgage-backed securities$13,677 $(62)$31 $(1)$13,708 $(63)
Collateralized mortgage obligations4,545 (15)— — 4,545 (15)
Total$18,222 $(77)$31 $(1)$18,253 $(78)
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)
Available-for-sale Securities, Allowance for Credit Loss Rollforward
The table below presents a rollforward by major security type for the year ended December 31, 2020 of the allowance for credit losses on securities available-for-sale.

(Dollars in thousands)Corporate Bonds
For the Year Ended December 31, 2020
Securities Available-for-Sale
Beginning balance$— 
Adjustment to initially apply ASU No. 2016-13 for CECL(300)
Change in securities for which a previous expected credit loss was recognized(569)
Ending balance$(869)