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Investment Securities
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investment Securities INVESTMENT SECURITIES (In Thousands)
The following table is the schedule of Available-For-Sale Securities at March 31, 2021, December 31, 2020 and March 31, 2020:
Available-For-Sale Securities
U.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
March 31, 2021
Available-For-Sale Securities,
  at Amortized Cost		$110,001 $508 $349,911 $1,000 $461,420 
Gross Unrealized Gains138 — 6,276 — 6,414 
Gross Unrealized Losses (1,769)— (1,776)(200)(3,745)
Available-For-Sale Securities,
  at Fair Value 		108,370 508 354,411 800 464,089 
Available-For-Sale Securities,
  Pledged as Collateral, at Fair Value		352,214 
Maturities of Debt Securities,
  at Amortized Cost:
Within One Year$— $68 $58 $— $126 
From 1 - 5 Years65,001 40 289,741 — 354,782 
From 5 - 10 Years45,000 400 60,112 1,000 106,512 
Over 10 Years— — — — — 
Maturities of Debt Securities,
  at Fair Value:
Within One Year$— $68 $64 $— $132 
From 1 - 5 Years63,774 40 295,370 — 359,184 
From 5 - 10 Years44,596 400 58,977 800 104,773 
Over 10 Years— — — — — 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$103,231 $— $120,780 $— $224,011 
12 Months or Longer— — — 800 800 
Total$103,231 $— $120,780 $800 $224,811 
Number of Securities in a
  Continuous Loss Position		14 — 16 1 31 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$1,769 $— $1,776 $— $3,545 
12 Months or Longer— — — 200 200 
Total$1,769 $— $1,776 $200 $3,745 
Disaggregated Details:
US Agency Obligations,
  at Amortized Cost		$110,001 
US Agency Obligations,
  at Fair Value		108,370 
US Government Agency
  Securities, at Amortized Cost		$11,582 
US Government Agency
  Securities, at Fair Value		11,658 
Government Sponsored Entity
  Securities, at Amortized Cost		338,329 
Government Sponsored Entity
  Securities, at Fair Value		342,753 
Available-For-Sale Securities
U.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
December 31, 2020
Available-For-Sale Securities,
  at Amortized Cost		$65,002 $528 $290,967 $1,000 $357,497 
Gross Unrealized Gains184 — 7,934 — 8,118 
Gross Unrealized Losses(74)— (54)(200)(328)
Available-For-Sale Securities,
  at Fair Value		65,112 528 298,847 800 365,287 
Available-For-Sale Securities,
  Pledged as Collateral,
  at Fair Value		244,411 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$29,926 $— $— $— $29,926 
12 Months or Longer— — 4,882 800 5,682 
Total$29,926 $— $4,882 $800 $35,608 
Number of Securities in a
  Continuous Loss Position		4 — 1 1 6 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$74 $— $— $— $74 
12 Months or Longer— — 54 200 254 
Total$74 $— $54 $200 $328 
Disaggregated Details:
US Agency Obligations,
  at Amortized Cost		$65,002 
US Agency Obligations,
  at Fair Value		65,112 
US Government Agency
  Securities, at Amortized Cost		$12,696 
US Government Agency
  Securities, at Fair Value		12,683 
Government Sponsored Entity
  Securities, at Amortized Cost		278,271 
Government Sponsored Entity
  Securities, at Fair Value		286,164 
Available-For-Sale Securities
U.S. Government & Agency
Obligations		State and
Municipal
Obligations		Mortgage-
Backed
Securities		Corporate
and Other
Debt
Securities		Total
Available-
For-Sale
Securities
March 31, 2020
Available-For-Sale Securities,
  at Amortized Cost		$5,002 $723 $365,333 $1,000 $372,058 
Gross Unrealized Gains179 — 7,484 — 7,663 
Gross Unrealized Losses— — (1,335)(200)(1,535)
Available-For-Sale Securities,
  at Fair Value		5,181 723 371,482 800 378,186 
Available-For-Sale Securities,
  Pledged as Collateral, at Fair Value		273,124 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$— $— $18,846 $— $18,846 
12 Months or Longer— — 59,262 800 60,062 
Total$— $— $78,108 $800 $78,908 
Number of Securities in a
  Continuous Loss Position		— — 27 1 28 
Unrealized Losses on Securities
  in a Continuous Loss Position:
Less than 12 Months$— $— $316 $— $316 
12 Months or Longer— — 1,019 200 1,219 
Total$— $— $1,335 $200 $1,535 
Disaggregated Details:
US Agency Obligations,
  at Amortized Cost		$5,002 
US Agency Obligations,
  at Fair Value		5,181 
US Government Agency
  Securities, at Amortized Cost		$58,089 
US Government Agency
  Securities, at Fair Value		57,091 
Government Sponsored Entity
  Securities, at Amortized Cost		307,244 
Government Sponsored Entity
  Securities, at Fair Value		314,391 

At March 31, 2021, there was no allowance for credit losses for the available for sale securities portfolio.
The following table is the schedule of Held-To-Maturity Securities at March 31, 2021, December 31, 2020 and March 31, 2020:
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
March 31, 2021
Held-To-Maturity Securities,
  at Amortized Cost		$191,202 $23,359 $214,561 
Gross Unrealized Gains5,843 956 6,799 
Gross Unrealized Losses— — — 
Held-To-Maturity Securities,
  at Fair Value		197,045 24,315 221,360 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		207,595 
Maturities of Debt Securities,
  at Amortized Cost:
Within One Year$16,513 $1,586 $18,099 
From 1 - 5 Years139,576 21,773 161,349 
From 5 - 10 Years34,110 — 34,110 
Over 10 Years1,003 — 1,003 
Maturities of Debt Securities,
  at Fair Value:
Within One Year$16,580 $1,639 $18,219 
From 1 - 5 Years143,850 22,676 166,526 
From 5 - 10 Years35,599 — 35,599 
Over 10 Years1,016 — 1,016 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$— $— $— 
12 Months or Longer— — — 
Total$— $— $— 
Number of Securities in a
  Continuous Loss Position		— — — 
Unrealized Losses on Securities
   in a Continuous Loss Position:
Less than 12 Months$— $— $— 
12 Months or Longer— — — 
Total$— $— $— 
Disaggregated Details:
US Government Agency
  Securities, at Amortized Cost		$8,310 
US Government Agency
  Securities, at Fair Value		8,597 
Government Sponsored Entity
  Securities, at Amortized Cost		15,049 
Government Sponsored Entity
  Securities, at Fair Value		15,718 
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
December 31, 2020
Held-To-Maturity Securities,
  at Amortized Cost		$192,352 $26,053 $218,405 
Gross Unrealized Gains7,080 1,094 8,174 
Gross Unrealized Losses(3)— (3)
Held-To-Maturity Securities,
  at Fair Value		199,429 27,147 226,576 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		211,176 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$1,513 $— $1,513 
12 Months or Longer— — — 
Total$1,513 $— $1,513 
Number of Securities in a
  Continuous Loss Position		4 — 4 
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$3 $— $3 
12 Months or Longer— — — 
Total$3 $— $3 
Disaggregated Details:
US Government Agency
  Securities, at Amortized Cost		$9,440 
US Government Agency
  Securities, at Fair Value		9,762 
Government Sponsored Entity
  Securities, at Amortized Cost		16,613 
Government Sponsored Entity
  Securities, at Fair Value		17,385 
March 31, 2020
Held-To-Maturity Securities,
  at Amortized Cost		$204,148 $34,372 $238,520 
Gross Unrealized Gains3,104 1,329 4,433 
Gross Unrealized Losses(149)— (149)
Held-To-Maturity Securities,
  at Fair Value		207,103 35,701 242,804 
Held-To-Maturity Securities,
  Pledged as Collateral, at Fair Value		231,539 
Securities in a Continuous
  Loss Position, at Fair Value:
Less than 12 Months$5,625 $— $5,625 
12 Months or Longer1,867 — 1,867 
Total$7,492 $— $7,492 
Number of Securities in a
  Continuous Loss Position		16 — 16 
Held-To-Maturity Securities
State and
Municipal
Obligations		Mortgage-
Backed
Securities		Total
Held-To
Maturity
Securities
Unrealized Losses on
  Securities in a Continuous
  Loss Position:
Less than 12 Months$16 $— $16 
12 Months or Longer133 — 133 
Total$149 $— $149 
Disaggregated Details:
US Government Agency
  Securities, at Amortized Cost		$1,594 
US Government Agency
  Securities, at Fair Value		1,655 
Government Sponsored Entity
  Securities, at Amortized Cost		32,778 
Government Sponsored Entity
  Securities, at Fair Value		34,046 

In the tables above, maturities of mortgage-backed securities are included based on their expected average lives. Actual maturities will differ because issuers may have the right to call or prepay obligations with or without prepayment penalties.
Securities in a continuous loss position, in the tables above for March 31, 2021, December 31, 2020 and March 31, 2020, do not reflect any deterioration of the credit worthiness of the issuing entities.
Arrow evaluates available-for-sale 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 noncredit-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 March 31, 2021, gross unrealized losses were primarily 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 the security before recovery of its amortized cost basis, which may be at maturity. Therefore, Arrow carried no allowance for credit loss at March 31, 2021 and there was no credit loss expense recognized by Arrow with respect to the securities portfolio during the three months ended March 31, 2021.  
Arrow's held to maturity debt securities are comprised of U.S. government agencies, U.S. government-sponsored enterprises or state and municipal obligations. U.S. government agencies and U.S. government-sponsored enterprise 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 held to maturity debt portfolio was immaterial and therefore no allowance for credit loss was recorded as of March 31, 2021.

The following table is the schedule of Equity Securities at March 31, 2021, December 31, 2020 and March 31, 2020:
Equity Securities
March 31, 2021December 31, 2020March 31, 2020
Equity Securities, at Fair Value$1,796$1,636$1,689

The following is a summary of realized and unrealized gains and losses recognized in net income on equity securities during the three month period ended March 31, 2021 and 2020:
Quarterly Period Ended:
March 31, 2021March 31, 2020
Net Gain (Loss) on Equity Securities$160 $(374)
Less: Net gain (loss) 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$160 $(374)