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Other Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  |  | $ 8,690 | $ 8,597
Accumulated Amortization |  |  |  |  | (6,401) | (5,901)
Net Carrying Amount |  | $ 2,696 | $ 3,107 | $ 3,625 | 2,289 | 2,696
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Finite-Lived Intangible Assets, Beginning Balance |  | 2,696 | 3,107 | 3,625 |  |
Intangible Assets Acquired |  | 93 | 146 | 107 |  |
Impairment of Intangible Assets, Finite-lived |  | 0 | 0 | (38) |  |
Amortization of Intangible Assets |  | (500) | (557) | (587) |  |
Finite-Lived Intangible Assets, Ending Balance |  | 2,289 | 2,696 | 3,107 |  |
Depositor Intangibles [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | [1] |  |  |  | 2,247 | 2,247
Accumulated Amortization | [1] |  |  |  | (2,247) | (2,247)
Net Carrying Amount | [1] | 0 | 0 | 10 | 0 | 0
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Finite-Lived Intangible Assets, Beginning Balance | [1] | 0 | 0 | 10 |  |
Intangible Assets Acquired | [1] | 0 | 0 | 0 |  |
Impairment of Intangible Assets, Finite-lived | [1] | 0 | 0 | 0 |  |
Amortization of Intangible Assets | [1] | 0 | 0 | (10) |  |
Finite-Lived Intangible Assets, Ending Balance | [1] | 0 | 0 | 0 |  |
Mortgage Servicing Rights [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | [2] |  |  |  | 2,061 | 1,968
Accumulated Amortization | [2] |  |  |  | (1,624) | (1,403)
Net Carrying Amount | [2] | 565 | 679 | 832 | 437 | 565
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Finite-Lived Intangible Assets, Beginning Balance | [2] | 565 | 679 | 832 |  |
Intangible Assets Acquired | [2] | 93 | 146 | 107 |  |
Impairment of Intangible Assets, Finite-lived | [2] | 0 | 0 | 0 |  |
Amortization of Intangible Assets | [2] | (221) | (260) | (260) |  |
Finite-Lived Intangible Assets, Ending Balance | [2] | 437 | 565 | 679 |  |
Customer Intangibles [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount | [1] |  |  |  | 4,382 | 4,382
Accumulated Amortization | [1] |  |  |  | (2,530) | (2,251)
Net Carrying Amount | [1] | 2,131 | 2,428 | 2,783 | $ 1,852 | $ 2,131
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Finite-Lived Intangible Assets, Beginning Balance | [1] | 2,131 | 2,428 | 2,783 |  |
Intangible Assets Acquired | [1] | 0 | 0 | 0 |  |
Impairment of Intangible Assets, Finite-lived | [1] | 0 | 0 | (38) |  |
Amortization of Intangible Assets | [1] | (279) | (297) | (317) |  |
Finite-Lived Intangible Assets, Ending Balance | [1] | $ 1,852 | $ 2,131 | $ 2,428 |  |
[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.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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