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Loans (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for loan losses
Beginning balance	$ 11,319	$ 9,390	$ 10,852	$ 8,978	$ 8,978
Provision for loan losses	950	990	2,000	1,770	0
Loans charged off	(725)	(819)	(1,668)	(1,397)
Recoveries	202	159	562	369
Ending balance	11,746	9,720	11,746	9,720	10,852
Commercial real estate
Allowance for loan losses
Beginning balance	3,638	3,181	3,577	3,127	3,127
Provision for loan losses	365	335	442	378
Loans charged off	(67)	(307)	(207)	(307)
Recoveries	18	1	142	12
Ending balance	3,954	3,210	3,954	3,210	3,577
Commercial
Allowance for loan losses
Beginning balance	1,846	1,452	1,874	1,373	1,373
Provision for loan losses	198	212	215	276
Loans charged off	(113)	(37)	(215)	(37)
Recoveries	5	7	62	22
Ending balance	1,936	1,634	1,936	1,634	1,874
Residential real estate
Allowance for loan losses
Beginning balance	2,321	1,914	2,205	1,845	1,845
Provision for loan losses	5	196	114	271
Loans charged off	(36)	(44)	(42)	(78)
Recoveries	20	15	33	43
Ending balance	2,310	2,081	2,310	2,081	2,205
Consumer
Allowance for loan losses
Beginning balance	2,813	2,218	2,766	2,160	2,160
Provision for loan losses	464	521	1,040	967
Loans charged off	(509)	(431)	(1,204)	(975)
Recoveries	159	136	325	292
Ending balance	2,927	2,444	2,927	2,444	2,766
Unallocated
Allowance for loan losses
Beginning balance	701	625	430	473	473
Provision for loan losses	(82)	(274)	189	(122)
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Ending balance	$ 619	$ 351	$ 619	$ 351	$ 430

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- Definition

Provision (reversal) for loan losses expensed.

+ References

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB
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