Other Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Estimated Annual Amoritzation Expense: [Abstract]
2018		$ 438
2019		347
2020		298
2021		260
2022		222
2023 and beyond		724
Net Carrying Amount		2,289	$ 2,696	$ 3,107	$ 3,625
Mortgage Servicing Rights [Member]
Estimated Annual Amoritzation Expense: [Abstract]
2018	[1]	176
2019	[1]	102
2020	[1]	71
2021	[1]	50
2022	[1]	29
2023 and beyond	[1]	9
Net Carrying Amount	[1]	437	565	679	832
Customer Intangibles [Member]
Estimated Annual Amoritzation Expense: [Abstract]
2018	[2]	262
2019	[2]	245
2020	[2]	227
2021	[2]	210
2022	[2]	193
2023 and beyond	[2]	715
Net Carrying Amount	[2]	$ 1,852	$ 2,131	$ 2,428	$ 2,783

[1] 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.

[2] Amortization of depositor intangibles and customer intangibles are reported in the Consolidated Statements of Income as a component of other operating expense.