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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available for Sale Securities
The amortized cost and estimated fair value of securities available for sale along with gross unrealized gains and losses are summarized as follows:
 
 
(dollars in thousands)
 
Amortized
Cost
Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair
Value
December 31, 2021    
U.S. treasury securities$88,638 $— $(1,087)$87,551 
U.S. agency17,916 5 (140)17,781 
State, county and municipal securities252,632 877 (3,356)250,153 
Corporate debt securities48,153 520 (265)48,408 
Mortgage-backed securities539,172 2,160 (7,061)534,271 
Total debt securities$946,511 $3,562 $(11,909)$938,164 
(dollars in thousands)
 
Amortized
Cost
Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair
Value
December 31, 2020    
U.S. treasury securities$245 $— $— $245 
U.S. agency1,000 4 — 1,004 
State, county and municipal securities61,298 1,155 (65)62,388 
Corporate debt securities4,250 1 (1)4,250 
Mortgage-backed securities305,438 7,837 (348)312,927 
Total debt securities$372,231 $8,997 $(414)$380,814 
Schedule of Unrealized Loss on Investments
The gross unrealized losses and estimated fair value of securities aggregated by category and length of time that securities have been in a continuous unrealized loss position are summarized as follows:
 Less Than 12 Months12 Months or MoreTotal
(dollars in thousands)Estimated
Fair
Value
 
Unrealized
Losses
Estimated
Fair
Value
 
Unrealized
Losses
Estimated
Fair
Value
 
Unrealized
Losses
December 31, 2021      
U.S. treasury securities$87,302 $(1,087)$— $— $87,302 $(1,087)
U.S. agency10,969 (140)— — 10,969 (140)
State, county and municipal securities180,551 (3,131)5,970 (225)186,521 (3,356)
Corporate debt securities31,977 (265)— — 31,977 (265)
Mortgage-backed securities377,413 (6,421)21,129 (640)398,542 (7,061)
Total debt securities$688,212 $(11,044)$27,099 $(865)$715,311 $(11,909)
December 31, 2020
State, county and municipal securities$8,282 $(65)$— $— $8,282 $(65)
Corporate debt securities999 (1)— — 999 (1)
Mortgage-backed securities28,835 (77)3,949 (271)32,784 (348)
Total debt securities$38,116 $(143)$3,949 $(271)$42,065 $(414)
Schedule of Investments Classified by Contractual Maturity Date This is often the case with mortgage-backed securities, which are disclosed separately in the table below.
 
Securities
Available for Sale
(dollars in thousands)Amortized
Cost		Fair
Value
Due in one year or less$453 $453 
Due after one year through five years49,599 49,622 
Due after five years through ten years144,692 143,011 
Due after ten years212,595 210,807 
 $407,339 $403,893 
Mortgage-backed securities539,172 534,271 
 $946,511 $938,164