Fair Value - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Local school district bonds	$ 5,018		$ 5,018		$ 5,021
Impaired loans	3,978		3,978		6,093
Outstanding balance of impaired loans	4,174		4,174		7,523
Related Allowance	1,508		1,508		1,594
Provision	0	$ 0	300	$ 0
Other real estate owned, net	5,541		5,541		8,401
Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	44,745		44,745		27,655
Fair value measurements | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	44,745		44,745		27,655
Impaired financing receivable, recent appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	400		400		600
Outstanding balance of impaired loans	1,000		1,000		900
Related Allowance	600		600		300
Provision			600		100
Other real estate, recent appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, net	2,900		2,900		1,700
Real estate acquired, outstanding balance of related loan	3,600		3,600		$ 2,900
Valuation allowance of real estate owned	700		700
Local school district bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Local school district bonds	$ 5,000		$ 5,000