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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Allowance for Credit Losses of HTM 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 March 31, 2022 and December 31, 2021, by contractual maturity within each type:
 At March 31, 2022
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair Value
Securities Held-to-Maturity
U.S. government corporations and agencies:
Within 1 year$2,000 $8 $— $— $2,008 
2,000 8 — — 2,008 
Residential mortgage-backed securities:
After 1 year to 5 years1,188 — (16)— 1,172 
After 5 years to 10 years5,858 7 (32)— 5,833 
Over 10 years157,293 268 (8,650)— 148,911 
164,339 275 (8,698)— 155,916 
Total$166,339 $283 $(8,698)$— $157,924 
Securities Available-for-Sale
State and political subdivisions:
After 1 year to 5 years$2,326 $1 $(15)$— $2,312 
2,326 1 (15)— 2,312 
Residential mortgage-backed securities:
Within 1 year21 — — — 21 
After 1 year to 5 years370 — (4)— 366 
After 5 years to 10 years3,533 — (48)— 3,485 
Over 10 years271,817 32 (19,033)— 252,816 
275,741 32 (19,085)— 256,688 
Collateralized mortgage obligations:
After 5 years to 10 years439 — (7)— 432 
Over 10 years2,631 — (116)— 2,515 
3,070 — (123)— 2,947 
Corporate bonds:
Within 1 year1,500 — — — 1,500 
After 1 year to 5 years29,726 64 (561)(85)29,144 
After 5 years to 10 years60,497 — (1,904)(1,190)57,403 
91,723 64 (2,465)(1,275)88,047 
Total$372,860 $97 $(21,688)$(1,275)$349,994 
 At December 31, 2021
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair Value
Securities Held-to-Maturity
U.S. government corporations and agencies:
Within 1 year$6,999 $34 $— $— $7,033 
6,999 34 — — 7,033 
Residential mortgage-backed securities:
After 5 years to 10 years5,208 194 — — 5,402 
Over 10 years164,776 2,175 (984)— 165,967 
169,984 2,369 (984)— 171,369 
Total$176,983 $2,403 $(984)$— $178,402 
Securities Available-for-Sale
State and political subdivisions:
After 1 year to 5 years$2,326 $7 $— $— $2,333 
2,326 7 — — 2,333 
Residential mortgage-backed securities:
Within 1 year31 — — — 31 
After 1 year to 5 years153 5 — — 158 
After 5 years to 10 years2,286 82 — — 2,368 
Over 10 years220,153 671 (2,276)— 218,548 
222,623 758 (2,276)— 221,105 
Collateralized mortgage obligations:
After 5 years to 10 years481 7 — — 488 
Over 10 years2,813 — (23)— 2,790 
3,294 7 (23)— 3,278 
Corporate bonds:
Within 1 year2,500 4 — — 2,504 
After 1 year to 5 years28,731 755 (67)(51)29,368 
After 5 years to 10 years60,000 — (703)(878)58,419 
91,231 759 (770)(929)90,291 
Total$319,474 $1,531 $(3,069)$(929)$317,007 
Information Related to Sales of Securities Available-for-Sale
The following table presents information related to sales of securities available-for-sale during the three months ended March 31, 2022 and 2021:
 Three Months Ended March 31,
(Dollars in thousands)20222021
Securities available-for-sale:
Proceeds from sales$1,530 $1,563 
Gross realized gains on sales30 65 
Tax expense related to net realized gains on sales6 14 
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 March 31, 2022 and December 31, 2021, 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 March 31, 2022
Securities Held-to-Maturity
Residential mortgage-backed securities$129,937 $(8,276)$3,872 $(422)$133,809 $(8,698)
Total$129,937 $(8,276)$3,872 $(422)$133,809 $(8,698)
Securities Available-for-Sale
State and political subdivisions$1,281 $(15)$— $— $1,281 $(15)
Residential mortgage-backed securities205,772 (13,887)48,596 (5,198)254,368 (19,085)
Collateralized mortgage obligations2,947 (123)— — 2,947 (123)
Corporate bonds1,280 (1)— — 1,280 (1)
Total$211,280 $(14,026)$48,596 $(5,198)$259,876 $(19,224)
At December 31, 2021
Securities Held-to-Maturity
Residential mortgage-backed securities$89,837 $(984)$— $— $89,837 $(984)
Total$89,837 $(984)$— $— $89,837 $(984)
Securities Available-for-Sale
Residential mortgage-backed securities$164,326 $(1,816)$12,097 $(460)$176,423 $(2,276)
Collateralized mortgage obligations2,790 (23)— — 2,790 (23)
Corporate bonds779 (1)— — 779 (1)
Total$167,895 $(1,840)$12,097 $(460)$179,992 $(2,300)
Available-for-sale Securities, Allowance for Credit Loss Rollforward
The table below presents a rollforward by major security type for the three months ended March 31, 2022 of the allowance for credit losses on securities available-for-sale.

(Dollars in thousands)Corporate Bonds
Three months ended March 31, 2022
Securities Available-for-Sale
Beginning balance$(929)
Additions for securities for which no previous expected credit losses were recognized(45)
Change in securities for which a previous expected credit loss was recognized(301)
Ending balance$(1,275)
Three months ended March 31, 2021
Securities Available-for-Sale
Beginning balance$(869)
Additions for securities for which no previous expected credit losses were recognized(19)
Change in securities for which a previous expected credit loss was recognized403 
Ending balance$(485)