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SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule 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 is provided in the tables below.
(dollars in thousands)Amortized
Cost		Gross Unrealized GainGross Unrealized LossesAllowance for Credit LossesFair Value
March 31, 2022
U.S. Treasury securities$2,250 $0 $(4)$0 $2,246 
U.S. government sponsored agencies164,514 0 (11,622)0 152,892 
Mortgage-backed securities: residential634,654 680 (39,013)0 596,321 
Mortgage-backed securities: commercial96 0 0 0 96 
State and municipal securities838,427 4,608 (72,055)0 770,980 
Total$1,639,941 $5,288 $(122,694)$0 $1,522,535 
December 31, 2021
U.S. Treasury securities$900 $0 $0 $0 $900 
U.S. government sponsored agencies145,858 39 (2,445)0 143,452 
Mortgage-backed securities: residential487,157 4,455 (4,936)0 486,676 
Mortgage-backed securities: commercial522 1 0 0 523 
State and municipal securities742,532 25,749 (1,274)0 767,007 
Total$1,376,969 $30,244 $(8,655)$0 $1,398,558 
Schedule of Available-For-Sale Securities By Maturity
Information regarding the fair value and amortized cost of available-for-sale debt securities by maturity as of March 31, 2022 is presented below. Maturity information is based on contractual maturity for all securities other than mortgage-backed securities. Actual maturities of securities may differ from contractual maturities because borrowers may have the right to prepay the obligation without a prepayment penalty.
(dollars in thousands)Amortized CostFair
Value
Due in one year or less$3,356 $3,357 
Due after one year through five years11,031 11,140 
Due after five years through ten years54,556 54,559 
Due after ten years936,248 857,062 
1,005,191 926,118 
Mortgage-backed securities634,750 596,417 
Total debt securities$1,639,941 $1,522,535 
Schedule of Sales of Securities Available For Sale Securities proceeds, gross gains and gross losses are presented below.
Three Months Ended March 31,
(dollars in thousands)20222021
Sales of securities available-for-sale
Proceeds$0 $13,506 
Gross gains0 753 
Gross losses0 0 
Number of securities0 7 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
Information regarding securities with unrealized losses as of March 31, 2022 and December 31, 2021 is presented below. The tables divide 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
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
March 31, 2022            
U.S. Treasury securities$2,246 $4 $0 $0 $2,246 $4 
U.S. government sponsored agencies126,338 8,757 26,554 2,865 152,892 11,622 
Mortgage-backed securities: residential441,367 26,752 109,331 12,261 550,698 39,013 
Mortgage-backed securities: commercial96 0 0 0 96 0 
State and municipal securities560,210 71,480 3,497 575 563,707 72,055 
Total temporarily impaired$1,130,257 $106,993 $139,382 $15,701 $1,269,639 $122,694 
December 31, 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 
Schedule of Quantitative Disclosure of Available-For-Sale Securities
The total number of securities with unrealized losses as of March 31, 2022 and December 31, 2021 is presented below.
Less than
12 months		12 months
or more		Total
March 31, 2022    
U.S. Treasury securities6 0 6 
U.S. government sponsored agencies12 5 17 
Mortgage-backed securities: residential90 15 105 
Mortgage-backed securities: commercial1 0 1 
State and municipal securities376 3 379 
Total temporarily impaired485 23 508 
December 31, 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