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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-For-Sale Securities Information related to the amortized cost, fair value and allowance for credit losses of securities available-for-sale and the related gross unrealized gains and losses recognized in accumulated other comprehensive income at December 31, 2021 is provided in the tables below.
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gain		Gross
Unrealized
Losses		Fair
Value
2021
U.S. Treasury securities$900 $0 $0 $900 
U.S. government sponsored agencies145,858 39 (2,445)143,452 
Mortgage-backed securities: residential487,157 4,455 (4,936)486,676 
Mortgage-backed securities: commercial522 1 0 523 
State and municipal securities742,532 25,749 (1,274)767,007 
Total$1,376,969 $30,244 $(8,655)$1,398,558 
2020
U.S. government sponsored agencies$36,492 $56 $(61)$36,487 
Mortgage-backed securities: residential270,231 9,289 (17)279,503 
Mortgage-backed securities: commercial35,877 1,004 0 36,881 
State and municipal securities355,306 26,696 (28)381,974 
Total$697,906 $37,045 $(106)$734,845 
Schedule of Available-For-Sale Securities By Maturity
(dollars in thousands)Amortized
Cost		Fair
Value
Due in one year or less$3,700 $3,704 
Due after one year through five years9,534 9,823 
Due after five years through ten years52,232 54,892 
Due after ten years823,824 842,940 
889,290 911,359 
Mortgage-backed securities487,679 487,199 
Total debt securities$1,376,969 $1,398,558 
Schedule of Sales of Securities Available For Sale
Security proceeds, gross gains and gross losses for 2021, 2020 and 2019 were as follows:
(dollars in thousands)202120202019
Sales of securities available-for-sale
Proceeds$13,964 $8,018 $57,114 
Gross gains797 433 279 
Gross losses0 0 (137)
Number of securities9 17 46 
Schedule of Available-For-Sale Securities Continuous Unrealized Loss Position Information regarding securities with unrealized losses as of December 31, 2021 and 2020 is presented below. The tables distribute the securities between those with unrealized losses for less than twelve months and those with unrealized losses for twelve months or more.
Less than 12 months12 months or moreTotal
(dollars in thousands)Fair
Value		Unrealized LossesFair
Value		Unrealized LossesFair
Value		Unrealized Losses
2021            
U.S. government sponsored agencies$85,968 $1,364 $28,676 $1,081 $114,644 $2,445 
Mortgage-backed securities: residential272,264 4,076 22,792 860 295,056 4,936 
State and municipal securities138,659 1,274 0 0 138,659 1,274 
Total temporarily impaired$496,891 $6,714 $51,468 $1,941 $548,359 $8,655 
2020
U.S. government sponsored agencies$19,800 $61 $0 $0 $19,800 $61 
Mortgage-backed securities: residential3 0 3,112 17 3,115 17 
State and municipal securities6,921 28 0 0 6,921 28 
Total temporarily impaired$26,724 $89 $3,112 $17 $29,836 $106 
Schedule of Quantitative Disclosure of Available-For-Sale Securities
The number of securities with unrealized losses as of December 31, 2021 and 2020 is presented below.
Less than
12 months		12 months
or more		Total
2021    
U.S. government sponsored agencies8 5 13 
Mortgage-backed securities: residential29 3 32 
State and municipal securities80 0 80 
Total temporarily impaired117 8 125 
2020
U.S. government sponsored agencies3 0 3 
Mortgage-backed securities: residential2 1 3 
State and municipal securities2 0 2 
Total temporarily impaired7 1 8