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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Available for sale debt securities, fair value	$ 227,601	$ 226,542
Mortgage servicing rights, fair value	2,813	2,713
U.S. Treasury
Assets:
Available for sale debt securities, fair value		0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available for sale debt securities, fair value	1,930	1,967
Mortgage servicing rights, fair value	0	0
Assets, Total	68,754	73,932
Other Observable Inputs (Level 2)
Assets:
Available for sale debt securities, fair value	225,671	224,575
Mortgage servicing rights, fair value	0	0
Assets, Total	232,863	233,449
Significant Unobservable Inputs (Level 3)
Assets:
Available for sale debt securities, fair value	0	0
Mortgage servicing rights, fair value	2,813	2,713
Assets, Total	1,064,520	1,060,866
Recurring
Assets:
Assets, Total	230,414	229,255
Recurring | U.S. Treasury
Assets:
Available for sale debt securities, fair value	1,930
Recurring | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	11,092	12,073
Recurring | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	46,059	36,897
Recurring | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	41,459	46,656
Recurring | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	127,061	128,949
Recurring | Mortgage servicing rights
Assets:
Mortgage servicing rights, fair value	2,813	2,713
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Assets, Total	1,930	1,967
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	1,930	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	225,671	224,575
Recurring | Other Observable Inputs (Level 2) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	0	1,967
Recurring | Other Observable Inputs (Level 2) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	11,092	12,073
Recurring | Other Observable Inputs (Level 2) | Government sponsored enterprises
Assets:
Available for sale debt securities, fair value	46,059	36,897
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	41,459	46,656
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets:
Mortgage servicing rights, fair value	127,061	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	2,813	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	$ 2,813	$ 2,713

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
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