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Loans (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Allowance for loan losses
Beginning balance	$ 11,746	$ 9,720	$ 10,852	$ 8,978	$ 8,978
Provision for loan losses	950	1,110	2,950	2,880	0
Loans charged off	(809)	(562)	(2,477)	(1,959)
Recoveries	217	250	779	619
Ending balance	12,104	10,518	12,104	10,518	10,852
Commercial real estate
Allowance for loan losses
Beginning balance	3,954	3,210	3,577	3,127	3,127
Provision for loan losses	264	138	706	516
Loans charged off	0	(8)	(207)	(315)
Recoveries	1	1	143	13
Ending balance	4,219	3,341	4,219	3,341	3,577
Commercial
Allowance for loan losses
Beginning balance	1,936	1,634	1,874	1,373	1,373
Provision for loan losses	87	188	302	464
Loans charged off	(10)	0	(225)	(37)
Recoveries	2	0	64	22
Ending balance	2,015	1,822	2,015	1,822	1,874
Residential real estate
Allowance for loan losses
Beginning balance	2,310	2,081	2,205	1,845	1,845
Provision for loan losses	36	105	150	376
Loans charged off	(74)	(87)	(116)	(165)
Recoveries	61	48	94	91
Ending balance	2,333	2,147	2,333	2,147	2,205
Consumer
Allowance for loan losses
Beginning balance	2,927	2,444	2,766	2,160	2,160
Provision for loan losses	552	423	1,592	1,390
Loans charged off	(725)	(467)	(1,929)	(1,442)
Recoveries	153	201	478	493
Ending balance	2,907	2,601	2,907	2,601	2,766
Unallocated
Allowance for loan losses
Beginning balance	619	351	430	473	473
Provision for loan losses	11	256	200	134
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Ending balance	$ 630	$ 607	$ 630	$ 607	$ 430

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Provision (reversal) for loan losses expensed.

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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)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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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.

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