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SECURITIES
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
SECURITIES SECURITIES    
Trading Securities
The Company had trading securities of $3.7 million and $2.8 million at December 31, 2021 and 2020, respectively. These securities are held in a rabbi trust and will be used for future payments associated with the Company's non-qualified 401(k) Restoration Plan and Non-qualified Deferred Compensation Plan.
Equity Securities
The Company had equity securities of $23.2 million and $22.1 million at December 31, 2021 and 2020, respectively. These securities consist primarily of mutual funds held in a rabbi trust and will be used for future payments associated with the Company’s supplemental executive retirement plans.
The following table represents a summary of the gains and losses recognized within non-interest income and non-interest expense within the consolidated statements of income that relate to equity securities for the periods indicated:
Years Ended December 31
202120202019
(Dollars in thousands)
Net gains recognized during the period on equity securities$554 $528 $1,566 
Less: net gains recognized during the period on equity securities sold during the period192 14 18 
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date$362 $514 $1,548 

Available for Sale Securities

The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) at the dates indicated:

 December 31, 2021December 31, 2020
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$217,393 $990 $(2,901)$— $215,482 $22,476 $1,640 $— $— $24,116 
U.S. treasury securities873,467 172 (12,191)— 861,448 — — — — — 
Agency mortgage-backed securities364,955 4,512 (5,534)— 363,933 224,293 9,337 (1)— 233,629 
Agency collateralized mortgage obligations78,966 1,282 (571)— 79,677 88,687 3,083 (87)— 91,683 
State, county, and municipal securities192 11 — — 203 790 17 — — 807 
Single issuer trust preferred securities issued by banks489 2 — — 491 489 — (1)— 488 
Pooled trust preferred securities issued by banks and insurers 1,199 — (199)— 1,000 1,429 — (373)— 1,056 
Small business administration pooled securities47,075 1,839 — — 48,914 57,289 3,792 — — 61,081 
Total available for sale securities$1,583,736 $8,808 $(21,396)$— $1,571,148 $395,453 $17,869 $(462)$— $412,860 

The Company did not record a provision for estimated credit losses on any available for sale securities for the years ended December 31, 2021 and 2020. Excluded from the table above is accrued interest on available for sale securities of $3.0 million and $1.2 million at December 31, 2021 and 2020, respectively, which is included within other assets on the Consolidated Balance Sheets. Additionally, the Company did not record any write-offs of accrued interest income on available for sale securities for the years ended December 31, 2021 and 2020. No securities held by the Company were delinquent on contractual payments at December 31, 2021 and 2020, nor were any securities placed on non-accrual status for the years then ended.

When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of securities available for sale for the years ended December 31, 2021 and 2020, and therefore no gains or losses were realized for the periods presented.
The following tables shows the gross unrealized losses and fair value of the Company’s available for sale securities which are in an unrealized loss position, and for which the Company has not recorded a provision for credit losses as of the dates indicated. These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position:
  December 31, 2021
  Less than 12 months12 months or longerTotal
# of
holdings		Fair ValueUnrealized
Losses		Fair
Value		Unrealized
Losses		Fair ValueUnrealized
Losses
  (Dollars in thousands)
U.S. government agency securities6 $160,913 $(2,901)$— $— $160,913 $(2,901)
U.S. treasury securities17 811,993 (12,191)— — 811,993 (12,191)
Agency mortgage-backed securities12 214,678 (5,534)— — 214,678 (5,534)
Agency collateralized mortgage obligations1 22,960 (571)— — 22,960 (571)
Pooled trust preferred securities issued by banks and insurers1 — — 1,000 (199)1,000 (199)
Total impaired available for sale securities37 $1,210,544 $(21,197)$1,000 $(199)$1,211,544 $(21,396)

December 31, 2020
Less than 12 months12 months or longerTotal
# of
holdings		Fair ValueUnrealized
Losses		Fair
Value		Unrealized
Losses		Fair ValueUnrealized
Losses
Agency mortgage-backed securities3 $437 $(1)$— $— $437 $(1)
Agency collateralized mortgage obligations2 23,323 (87)— — 23,323 (87)
Single issuer trust preferred securities issued by banks and insurers1 488 (1)— — 488 (1)
Pooled trust preferred securities issued by banks and insurers1 — — 1,056 (373)1,056 (373)
Total impaired available for sale securities7 $24,248 $(89)$1,056 $(373)$25,304 $(462)

The Company does not intend to sell these investments and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell each security before the recovery of its amortized cost basis and management does not believe that any of the securities are impaired due to reasons of credit quality. As a result, the Company did not recognize a provision for credit losses on these investments for the years ended December 31, 2021 and 2020. The Company made this determination by reviewing various qualitative and quantitative factors regarding each investment category, such as current market conditions, extent and nature of changes in fair value, issuer rating changes and trends, volatility of earnings, and current analysts’ evaluations.
As a result of the Company’s review of these qualitative and quantitative factors, the causes of the impairments listed in the table above by category were as follows at December 31, 2021:
•U.S. Government Agency Securities, U.S. Treasury Securities, Agency Mortgage-Backed Securities and Agency Collateralized Mortgage Obligations: These portfolios have contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. Government or one of its agencies.
•Pooled Trust Preferred Securities: This portfolio consists of one below investment grade security which is performing. The unrealized loss on this security is attributable to the illiquid nature of the trust preferred market in the current economic and regulatory environment. Management evaluates collateral credit and instrument
structure, including current and expected deferral and default rates and timing. In addition, discount rates are determined by evaluating comparable spreads observed currently in the market for similar instruments.
Held to Maturity Securities

The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) at the dates indicated:
 December 31, 2021December 31, 2020
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$32,987 $— $(441)$— $32,546 $— $— $— — $— 
U.S. treasury securities102,560 6 (324)— 102,242 4,017 60 — — 4,077 
Agency mortgage-backed securities493,012 8,495 (4,271)— 497,236 356,085 18,036 — — 374,121 
Agency collateralized mortgage obligations415,736 3,232 (10,123)— 408,845 335,993 8,466 (340)— 344,119 
Single issuer trust preferred securities issued by banks1,500 8 — — 1,508 1,500 — (2)— 1,498 
Small business administration pooled securities21,023 733 — — 21,756 26,917 1,445 — — 28,362 
Total held to maturity securities$1,066,818 $12,474 $(15,159)$— $1,064,133 $724,512 $28,007 $(342)$— $752,177 

The Company did not record a provision for estimated credit losses on any held to maturity securities for the years ended December 31, 2021 and 2020. Excluded from the table above is accrued interest on held to maturity securities of $2.0 million and $1.5 million at December 31, 2021 and 2020, respectively, which is included within other assets on the Consolidated Balance Sheets. Additionally, the Company did not record any write-offs of accrued interest income on held to maturity securities for the years ended December 31, 2021 and 2020. No securities held by the Company were delinquent on contractual payments at December 31, 2021 and 2020, nor were any securities placed on non-accrual status for the years then ended.
When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of held to maturity securities for the years ended December 31, 2021 and 2020, and therefore no gains or losses were realized for such periods.

The Company monitors the credit quality of held to maturity securities through the use of credit ratings. Credit ratings are monitored by the Company on at least a quarterly basis. At December 31, 2021 and 2020, all held to maturity securities held by the Company were rated investment grade or higher.
The actual maturities of certain securities may differ from the contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. A schedule of the contractual maturities of securities available for sale and securities held to maturity at December 31, 2021 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$10,000 $10,007 $43,831 $44,065 $163,562 $161,410 $— $— $217,393 $215,482 
U.S. treasury securities— — 643,068 633,504 230,399 227,944 — — 873,467 861,448 
Agency mortgage-backed securities14,411 14,563 95,373 96,519 142,730 139,331 112,441 113,520 364,955 363,933 
Agency collateralized mortgage obligations— — — — — — 78,966 79,677 78,966 79,677 
State, county, and municipal securities— — 192 203 — — — — 192 203 
Single issuer trust preferred securities issued by banks— — — — — — 489 491 489 491 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,199 1,000 1,199 1,000 
Small business administration pooled securities— — — — — — 47,075 48,914 47,075 48,914 
Total available for sale securities$24,411 $24,570 $782,464 $774,291 $536,691 $528,685 $240,170 $243,602 $1,583,736 $1,571,148 
Held to maturity securities
U.S. government agency securities$— $— $32,987 $32,546 $— $— $— $— $32,987 $32,546 
U.S. Treasury securities2,003 2,009 — — 100,557 100,233 — — 102,560 102,242 
Agency mortgage-backed securities— — 3,016 3,156 288,552 287,116 201,444 206,964 493,012 497,236 
Agency collateralized mortgage obligations— — — — — — 415,736 408,845 415,736 408,845 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 21,023 21,756 21,023 21,756 
Total held to maturity securities2,003 2,009 36,003 35,702 390,609 388,857 638,203 637,565 1,066,818 1,064,133 
Total$26,414 $26,579 $818,467 $809,993 $927,300 $917,542 $878,373 $881,167 $2,650,554 $2,635,281 
Included in the table above is $3.2 million of callable securities at December 31, 2021.
The carrying value of securities pledged to secure public funds, trust deposits, repurchase agreements and for other purposes, as required or permitted by law, was $740.6 million and $419.6 million at December 31, 2021 and 2020, respectively.
At December 31, 2021 and 2020, the Company had no investments in obligations of individual states, counties, or municipalities which exceeded 10% of stockholders’ equity.