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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
The following table presents information on Arrow’s other intangible assets (other than goodwill) as of December 31, 2017, 2016 and 2015:
 
Depositor
Intangibles1
 
Mortgage
Servicing
Rights2
 
Customer Intangibles1
 
Total  
Gross Carrying Amount, December 31, 2017
$
2,247

 
$
2,061

 
$
4,382

 
$
8,690

Accumulated Amortization
(2,247
)
 
(1,624
)
 
(2,530
)
 
(6,401
)
Net Carrying Amount, December 31, 2017
$
—

 
$
437

 
$
1,852

 
$
2,289

Gross Carrying Amount, December 31, 2016
$
2,247

 
$
1,968

 
$
4,382

 
$
8,597

Accumulated Amortization
(2,247
)
 
(1,403
)
 
(2,251
)
 
(5,901
)
Net Carrying Amount, December 31, 2016
$
—

 
$
565

 
$
2,131

 
$
2,696

 
 
 
 
 
 
 
 
Rollforward of Intangible Assets:
 
 
 
 
 
 
 
Balance, December 31, 2014
$
10

 
$
832

 
$
2,783

 
$
3,625

Intangible Assets Acquired
—

 
107

 
—

 
107

Intangible Assets Disposed
—

 
—

 
(38
)
 
(38
)
Amortization of Intangible Assets
(10
)
 
(260
)
 
(317
)
 
(587
)
Balance, December 31, 2015
—

 
679

 
2,428

 
3,107

Intangible Assets Acquired
—

 
146

 
—

 
146

Intangible Assets Disposed
—

 
—

 
—

 
—

Amortization of Intangible Assets
—

 
(260
)
 
(297
)
 
(557
)
Balance, December 31, 2016
—

 
565

 
2,131

 
2,696

Intangible Assets Acquired
—

 
93

 
—

 
93

Intangible Assets Disposed
—

 
—

 
—

 
—

Amortization of Intangible Assets
—

 
(221
)
 
(279
)
 
(500
)
Balance, December 31, 2017
$
—

 
$
437

 
$
1,852

 
$
2,289


1 Amortization of depositor intangibles and customer intangibles are reported in the Consolidated Statements of Income as a component of other operating expense.
2 Amortization of mortgage servicing rights is reported in the Consolidated Statements of Income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table presents the remaining estimated annual amortization expense for Arrow's intangible assets as of December 31, 2017:
 
 
Mortgage
Servicing
Rights
 
Customer Intangibles
 
Total
Estimated Annual Amortization Expense:
 
 
 
 
 
 
2018
 
$
176

 
$
262

 
$
438

2019
 
102

 
245

 
347

2020
 
71

 
227

 
298

2021
 
50

 
210

 
260

2022
 
29

 
193

 
222

2023 and beyond
 
9

 
715

 
724

Total
 
$
437

 
$
1,852

 
$
2,289