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Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Available for sale debt securities, fair value	$ 215,720	$ 226,542
Mortgage servicing rights, fair value	2,781	2,713
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available for sale debt securities, fair value	1,939	1,967
Mortgage servicing rights, fair value	0	0
Other Observable Inputs (Level 2)
Assets:
Available for sale debt securities, fair value	213,781	224,575
Mortgage servicing rights, fair value	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Available for sale debt securities, fair value	0	0
Mortgage servicing rights, fair value	2,781	2,713
Recurring
Assets:
Assets, Total	218,501	229,255
Recurring | U.S. Treasury
Assets:
Available for sale debt securities, fair value	1,939	1,967
Recurring | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	11,493	12,073
Recurring | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	38,177	36,897
Recurring | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	41,604	46,656
Recurring | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	122,507	128,949
Recurring | Mortgage servicing rights
Assets:
Mortgage servicing rights, fair value	2,781	2,713
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Assets, Total	1,939	1,967
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	1,939	1,967
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Other Observable Inputs (Level 2)
Assets:
Assets, Total	213,781	224,575
Recurring | Other Observable Inputs (Level 2) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Other Observable Inputs (Level 2) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	11,493	12,073
Recurring | Other Observable Inputs (Level 2) | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	38,177	36,897
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	41,604	46,656
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	122,507	128,949
Recurring | Other Observable Inputs (Level 2) | Mortgage servicing rights
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Assets, Total	2,781	2,713
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Assets:
Mortgage servicing rights, fair value	$ 2,781	$ 2,713

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 50
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