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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Guarantor Obligations
The following table presents the notional amount and fair value of Arrow's off-balance sheet commitments to extend credit and commitments under standby letters of credit as of September 30, 2021, December 31, 2020 and September 30, 2020:
Commitments to Extend Credit and Letters of Credit
September 30, 2021December 31, 2020September 30, 2020
Notional Amount:
Commitments to Extend Credit$431,452 $399,882 $364,861 
Standby Letters of Credit3,392 3,703 3,330 
Fair Value:
Commitments to Extend Credit$— $— $— 
Standby Letters of Credit21 28 30