Loans Receivable and Loans Held for Sale (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning			$ 2,158
Provision				$ 420
Balance, Ending	$ 2,125		2,125
Loans receivable
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	2,184	$ 1,934	2,158	1,724
Charge-offs	(43)	(21)	(150)	(212)
Recoveries	54	27	$ 117	108
Provision	(70)	100		420
Balance, Ending	2,125	2,040	$ 2,125	2,040
Loans receivable | Real estate | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 528	484	545	433
Charge-offs		(3)	(9)	(6)
Recoveries		11	9	11
Provision	$ (49)	9	(66)	63
Balance, Ending	479	501	479	501
Loans receivable | Real estate | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 786	$ 712	$ 722	$ 624
Charge-offs
Recoveries				$ 7
Provision	$ (83)	$ (16)	$ (19)	65
Balance, Ending	703	696	703	696
Loans receivable | Real estate | Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 159	$ 142	$ 155	$ 130
Charge-offs
Recoveries
Provision	$ (14)	$ 9	$ (10)	$ 21
Balance, Ending	145	151	145	151
Loans receivable | Construction real estate | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 6	$ 11	$ 13	$ 11
Charge-offs
Recoveries
Provision	$ 1	$ (5)	$ (6)	$ (5)
Balance, Ending	7	6	7	6
Loans receivable | Construction real estate | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 6	$ 8	$ 12	$ 2
Charge-offs
Recoveries
Provision	$ 8	$ 14	$ 2	$ 20
Balance, Ending	14	22	14	22
Loans receivable | Home equity, home improvement and second mortgages
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	447	314	431	254
Charge-offs	(26)	(4)	(115)	(181)
Recoveries	4	2	18	39
Provision	(25)	80	66	280
Balance, Ending	400	392	400	392
Loans receivable | Operating and term | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 117	$ 93	$ 109	87
Charge-offs				$ (1)
Recoveries
Provision	$ 144	$ 21	$ 152	$ 28
Balance, Ending	261	114	261	114
Loans receivable | Operating and term | Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 30	$ 14	$ 31	$ 18
Charge-offs
Recoveries
Provision	$ (1)	$ 7	$ (2)	$ 3
Balance, Ending	29	21	29	21
Loans receivable | Vehicle
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	$ 27	$ 30	$ 28	$ 30
Charge-offs
Recoveries		$ 1	$ 4	$ 3
Provision		(4)	(5)	(6)
Balance, Ending	$ 27	27	27	27
Loans receivable | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, Beginning	78	126	112	135
Charge-offs	(17)	(14)	(26)	(24)
Recoveries	50	13	86	48
Provision	(51)	(15)	(112)	(49)
Balance, Ending	$ 60	$ 110	$ 60	$ 110