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Investment Securities
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Investment Securities INVESTMENT SECURITIES (In Thousands)
The following table is the schedule of Available-For-Sale Securities at September 30, 2024, December 31, 2023 and September 30, 2023:
Available-For-Sale Securities
U.S. TreasuriesU.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
September 30, 2024
Available-For-Sale Securities,
  at Amortized Cost		$49,795 $145,000 $240 $272,008 $1,000 $468,043 
Gross Unrealized Gains229 58 — 33 — 320 
Gross Unrealized Losses — (3,708)— (27,545)(43)(31,296)
Available-For-Sale Securities,
  at Fair Value 		50,024 141,350 240 244,496 957 437,067 
Available-For-Sale Securities,
  Pledged as Collateral, at Fair
  Value		332,430 
Maturities of Debt Securities,
  at Amortized Cost:
Within One Year$24,846 $60,000 $— $2,012 $— $86,858 
From 1 - 5 Years24,949 85,000 — 170,711 1,000 281,660 
From 5 - 10 Years— — 240 99,285 — 99,525 
Over 10 Years— — — — — — 
Maturities of Debt Securities,
  at Fair Value:
Within One Year$24,865 $59,319 $— $1,985 $— $86,169 
From 1 - 5 Years25,159 82,031 — 156,934 957 265,081 
From 5 - 10 Years— — 240 85,577 — 85,817 
Over 10 Years— — — — — — 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$— $— $— $— $— $— 
12 Months or Longer— 126,292 — 238,220 957 365,469 
Total$— $126,292 $— $238,220 $957 $365,469 
Number of Securities in a
  Continuous Loss Position		— 17 — 91 1 109 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$— $— $— $— $— $— 
12 Months or Longer— 3,708 — 27,545 43 31,296 
Total$— $3,708 $— $27,545 $43 $31,296 
Disaggregated Details:
US Treasuries,
  at Amortized Cost		$49,795 
US Treasuries,
  at Fair Value		50,024 
US Agency Obligations,
  at Amortized Cost		$145,000 
US Agency Obligations,
  at Fair Value		141,350 
Local Municipal Obligations,
  at Amortized Cost		$240 
Local Municipal Obligations,
  at Fair Value		240 
US Government Agency
  Securities, at Amortized Cost		$6,908 
Available-For-Sale Securities
U.S. TreasuriesU.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
US Government Agency
  Securities, at Fair Value		6,690 
Government Sponsored Entity
  Securities, at Amortized Cost		265,100 
Government Sponsored Entity
  Securities, at Fair Value		237,806 
Corporate Trust Preferred Securities, at Amortized Cost$1,000 
Corporate Trust Preferred Securities, at Fair Value957 
December 31, 2023
Available-For-Sale Securities,
  at Amortized Cost		$73,761 $160,000 $280 $305,161 $1,000 $540,202 
Gross Unrealized Gains243 51 — 6 — 300 
Gross Unrealized Losses— (7,126)— (35,407)(200)(42,733)
Available-For-Sale Securities,
  at Fair Value		74,004 152,925 280 269,760 800 497,769 
Available-For-Sale Securities,
  Pledged as Collateral,
  at Fair Value		242,938 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$— $— $— $— $— $— 
12 Months or Longer— 137,874 — 269,286 800 407,960 
Total$— $137,874 $— $269,286 $800 $407,960 
Number of Securities in a
  Continuous Loss Position		— 19 — 97 1 117 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$— $— $— $— $— $— 
12 Months or Longer— 7,126 — 35,407 200 42,733 
Total$— $7,126 $— $35,407 $200 $42,733 
Disaggregated Details:
US Treasuries,
  at Amortized Cost		$73,761 
US Treasuries,
  at Fair Value		74,004 
US Agency Obligations,
  at Amortized Cost		$160,000 
US Agency Obligations,
  at Fair Value		152,925 
Local Municipal Obligations,
  at Amortized Cost		$280 
Local Municipal Obligations,
  at Fair Value		280 
US Government Agency
  Securities, at Amortized Cost		$7,291 
US Government Agency
  Securities, at Fair Value		6,864 
Government Sponsored Entity
  Securities, at Amortized Cost		297,870 
Government Sponsored Entity
  Securities, at Fair Value		262,896 
Corporate Trust Preferred Securities, at Amortized Cost$1,000 
Available-For-Sale Securities
U.S. TreasuriesU.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
Corporate Trust Preferred Securities, at Fair Value800 
September 30, 2023
Available-For-Sale Securities,
  at Amortized Cost		$— $190,000 $280 $398,323 $1,000 $589,603 
Gross Unrealized Gains— — — 1 — 1 
Gross Unrealized Losses— (13,579)— (56,585)(200)(70,364)
Available-For-Sale Securities,
  at Fair Value		— 176,421 280 341,739 800 519,240 
Available-For-Sale Securities,
  Pledged as Collateral, at Fair
  Value		390,923 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$— $14,914 $— $11,262 $— $26,176 
12 Months or Longer— 161,506 — 330,190 800 492,496 
Total$— $176,420 $— $341,452 $800 $518,672 
Number of Securities in a
  Continuous Loss Position		— 25 — 154 1 180 
Unrealized Losses on Securities
  in a Continuous Loss Position:
Less than 12 Months$— $86 $— $317 $— $403 
12 Months or Longer— 13,493 — 56,268 200 69,961 
Total$— $13,579 $— $56,585 $200 $70,364 
Disaggregated Details:
US Treasury Obligations,
  at Amortized Cost		$— 
US Treasury Obligations,
  at Fair Value		— 
US Agency Obligations,
  at Amortized Cost		$190,000 
US Agency Obligations,
  at Fair Value		176,421 
Local Municipal Obligations,
  at Amortized Cost		$280 
Local Municipal Obligations,
  at Fair Value		280 
US Government Agency
  Securities, at Amortized Cost		$7,416 
US Government Agency
  Securities, at Fair Value		6,885 
Government Sponsored Entity
  Securities, at Amortized Cost		390,907 
Government Sponsored Entity
  Securities, at Fair Value		334,854 
Corporate Trust Preferred Securities, at Amortized Cost$1,000 
Corporate Trust Preferred Securities, at Fair Value800 
At September 30, 2024, there was no allowance for credit losses for the AFS debt securities portfolio.

The following table is the schedule of Held-To-Maturity Securities at September 30, 2024, December 31, 2023 and September 30, 2023:
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
September 30, 2024
Held-To-Maturity Securities,
  at Amortized Cost		$96,275 $7,062 $103,337 
Gross Unrealized Losses(1,205)(203)(1,408)
Held-To-Maturity Securities,
  at Fair Value		95,070 6,859 101,929 
Held-To-Maturity Securities,
  Pledged as Collateral, at Carrying Value		82,532 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		81,123 
Maturities of Debt Securities,
  at Amortized Cost:
Within One Year$52,575 $— $52,575 
From 1 - 5 Years41,373 7,062 48,435 
From 5 - 10 Years2,321 — 2,321 
Over 10 Years6 — 6 
Maturities of Debt Securities,
  at Fair Value:
Within One Year$52,224 $— $52,224 
From 1 - 5 Years40,534 6,859 47,393 
From 5 - 10 Years2,306 — 2,306 
Over 10 Years6 — 6 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$175 $— $175 
12 Months or Longer73,705 6,858 80,563 
Total$73,880 $6,858 $80,738 
Number of Securities in a
  Continuous Loss Position		231 16 247 
Unrealized Losses on Securities
   in a Continuous Loss Position:
Less than 12 Months$— $— $— 
12 Months or Longer1,205 203 1,408 
Total$1,205 $203 $1,408 
Disaggregated Details:
Municipal Obligations, at Amortized Cost$96,275 
Municipal Obligations, at Fair Value95,070 
US Government Agency
  Securities, at Amortized Cost		$2,526 
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
US Government Agency
  Securities, at Fair Value		2,445 
Government Sponsored Entity
  Securities, at Amortized Cost		4,536 
Government Sponsored Entity
  Securities, at Fair Value		4,414 
December 31, 2023
Held-To-Maturity Securities,
  at Amortized Cost		$122,450 $8,945 $131,395 
Gross Unrealized Losses(2,157)(401)(2,558)
Held-To-Maturity Securities,
  at Fair Value		120,293 8,544 128,837 
Held-To-Maturity Securities,
  Pledged as Collateral, at Carrying Value		115,030 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		112,472 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$1,472 $— $1,472 
12 Months or Longer102,839 8,544 111,383 
Total$104,311 $8,544 $112,855 
Number of Securities in a
  Continuous Loss Position		319 16 335 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$14 $— $14 
12 Months or Longer2,143 402 2,545 
Total$2,157 $402 $2,559 
Disaggregated Details:
Municipal Obligations, at Amortized Cost$122,450 
Municipal Obligations, at Fair Value120,293 
US Government Agency
  Securities, at Amortized Cost		$3,114 
US Government Agency
  Securities, at Fair Value		2,954 
Government Sponsored Entity
  Securities, at Amortized Cost		5,831 
Government Sponsored Entity
  Securities, at Fair Value		5,589 
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
September 30, 2023
Held-To-Maturity Securities,
  at Amortized Cost		$131,017 $9,560 $140,577 
Gross Unrealized Gains— — — 
Gross Unrealized Losses(5,204)(562)(5,766)
Held-To-Maturity Securities,
  at Fair Value		125,813 8,998 134,811 
Held-To-Maturity Securities,
  Pledged as Collateral, at Carrying Value		117,723 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		111,957 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$1,575 $— $1,575 
12 Months or Longer108,092 8,998 117,090 
Total$109,667 $8,998 $118,665 
Number of Securities in a
  Continuous Loss Position		339 16 355 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$86 $— $86 
12 Months or Longer5,118 562 5,680 
Total$5,204 $562 $5,766 
Disaggregated Details:
Municipal Obligations, at Amortized Cost$131,017 
Municipal Obligations, at Fair Value125,813 
US Government Agency
  Securities, at Amortized Cost		$3,292 
US Government Agency
  Securities, at Fair Value		3,075 
Government Sponsored Entity
  Securities, at Amortized Cost		6,268 
Government Sponsored Entity
  Securities, at Fair Value		5,923 

In the tables above, maturities of mortgage-backed securities are included based on their contractual lives. Actual maturities will differ because issuers may have the right to call or prepay obligations with or without prepayment penalties.
Arrow's investment policy requires that investments held in our portfolio be investment grade or better at the time of purchase. Arrow performs an analysis of the creditworthiness of municipal obligations to determine if a security is of investment grade. The analysis may include but may not solely rely upon credit analysis conducted by external credit rating agencies.
Arrow evaluates AFS debt securities in unrealized loss positions at each measurement date to determine whether the decline in the fair value below the amortized cost basis (impairment) is due to credit-related factors or non-credit-related factors. Any impairment that is not credit related is recognized in other comprehensive income, net of applicable taxes. Credit-related impairment is recognized within the allowance for credit losses on the balance sheet, limited to the amount by which the amortized cost basis exceeds the fair value, with a corresponding adjustment to earnings via credit loss expense. Arrow determined that at September 30, 2024, gross unrealized losses were attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. Arrow does not intend to sell, nor is it more likely than not that Arrow will be required to sell any securities before recovery of its amortized cost basis, which may be at maturity. Therefore, Arrow carried no allowance for credit loss at September 30, 2024 and there was no credit loss expense recognized by Arrow with respect to the securities portfolio during the three months ended September 30, 2024.  
Arrow's HTM debt securities are comprised of U.S. government-sponsored enterprises (GSEs) or state and municipal obligations. GSE securities carry the explicit and/or implicit guarantee of the U.S. government, are widely recognized as “risk free,” and have a long history of zero credit loss. Arrow determined that the expected credit loss on its HTM debt portfolio was immaterial and therefore no allowance for credit loss was recorded as of September 30, 2024.

The following table is the schedule of Equity Securities at September 30, 2024, December 31, 2023 and September 30, 2023:
Equity Securities
September 30, 2024December 31, 2023September 30, 2023
Equity Securities, at Fair Value$5,089$1,925$1,960

The following is a summary of realized and unrealized gains and losses recognized in income on equity securities during the three and nine month periods ended September 30, 2024 and 2023:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
2024202320242023
Net Gain (Loss) on Equity Securities$94 $71 $165 $(214)
Less: Net gain recognized during the reporting period on equity securities sold during the period— — — — 
Unrealized net gain (loss) recognized during the reporting period on equity securities still held at the reporting date$94 $71 $165 $(214)