Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Preferred Stock.	Common stock Private offering	Common stock Initial public offering	Common stock	Additional Paid-In Capital Private offering	Additional Paid-In Capital Initial public offering	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Unallocated Employee Stock Ownership Plan Shares	Treasury Stock	Private offering	Initial public offering	Total
Balance at Dec. 31, 2012	$ 8,000,000			$ 57,000			$ 53,750,000	$ (426,000)	$ 479,000					$ 61,860,000
Balance (in shares) at Dec. 31, 2012				5,694,340
Increase (Decrease) in Stockholders' Equity
Sale of common, net offering costs				$ 1,000			1,209,000							1,210,000
Sale of common, net offering costs				120,363
Preferred stock dividend Series C								(60,000)						(60,000)
Purchase of Treasury Stock at Cost				$ (10,000)							$ (70,000)			(70,000)
Issuance of warrants related to subordinated debt							21,000							21,000
Stock based compensation							323,000							323,000
Net income								3,408,000						3,408,000
Other comprehensive income									(453,000)					(453,000)
Balance at Dec. 31, 2013	8,000,000			$ 58,000			55,303,000	2,922,000	26,000		(70,000)			66,239,000
Balance (in shares) at Dec. 31, 2013				5,804,703
Increase (Decrease) in Stockholders' Equity
Restricted stock units vested, net 6,398 shares withheld to cover tax witholdings														(500,000)
Sale of common, net offering costs		$ 6,000	$ 31,000		$ 5,432,000	$ 35,760,000						$ 5,438,000	$ 35,791,000
Sale of common, net offering costs		508,047	3,105,000
Preferred stock dividend Series C								(80,000)						(80,000)
Issuance of shares to Directors related to vesting of restricted stock units				7,000
Sale and finance of stock to ESOP							500,000			$ (500,000)				500,000
Sale and finace of stock to ESOP (in shares)				46,082
ESOP shares allocated							19,000			99,000				118,000
Stock based compensation							455,000							455,000
Net income								5,205,000						5,205,000
Other comprehensive income									146,000					146,000
Balance at Dec. 31, 2014	8,000,000			$ 95,000			97,469,000	8,047,000	172,000	(401,000)	(70,000)			$ 113,312,000
Balance (in shares) at Dec. 31, 2014				9,470,832										9,470,832
Increase (Decrease) in Stockholders' Equity
Restricted stock units vested, net 6,398 shares withheld to cover tax witholdings							(159,000)							$ (159,000)
Restricted stock units vested, net 6,398 shares withheld to cover tax witholdings, shares				26,426
Exercise of employee stock options							210,000							210,000
Exercise of employee stock options (in shares)				21,000
Preferred stock dividend Series C								(98,000)						(98,000)
Redeption of SBLF preferred stock Series C	$ (8,000,000)													(8,000,000)
Issuance of stock to ESOP							115,000			(5,000)				110,000
Issuance of stock to ESOP (in shares)				9,147
ESOP shares allocated							12,000			97,000				109,000
Common stock issued for acquisition of IBT Bancorp, Inc., net offering costs of $252				$ 12,000			17,441,000							17,453,000
Common stock issued for acquisition of IBT Bancorp, Inc., net offering costs of $252 (in shares)				1,185,067
Stock based compensation							633,000							633,000
Net income								8,790,000						8,790,000
Other comprehensive income									(314,000)					(314,000)
Balance at Dec. 31, 2015				$ 107,000			$ 115,721,000	$ 16,739,000	$ (142,000)	$ (309,000)	$ (70,000)			$ 132,046,000
Balance (in shares) at Dec. 31, 2015				10,712,472										10,712,472