Mergers and Acquisitions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Treasure State Bank
Business Acquisition
Effective Date of Acquisition	Aug. 31, 2016
Percentage of Outstanding Common Stock Acquired	100.00%
Business Combination, Consideration Transferred	$ 13,940,000
Number of Shares Issued for Aquisition	349,545
Cash consideration for outstanding shares	$ 3,475,000
Loans receivable	51,875,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due	54,819,000
Third-party Acquisition Related Costs	456,000
Net interest income and non-interest income	1,800,000
Net income	$ 897,000
Canon National Bank
Business Acquisition
Effective Date of Acquisition		Oct. 31, 2015
Percentage of Outstanding Common Stock Acquired		100.00%
Business Combination, Consideration Transferred		$ 31,308,000
Number of Shares Issued for Aquisition		554,206
Cash consideration for outstanding shares		$ 16,145,000
Loans receivable		159,759,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		164,568,000
Third-party Acquisition Related Costs		707,000
Net interest income and non-interest income		2,606,000
Net income		$ 563,000
Montana Community Banks, Inc.
Business Acquisition
Effective Date of Acquisition		Feb. 28, 2015
Percentage of Outstanding Common Stock Acquired		100.00%
Business Combination, Consideration Transferred		$ 22,995,000
Number of Shares Issued for Aquisition		443,644
Cash consideration for outstanding shares		$ 12,219,000
Loans receivable		84,689,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		88,817,000
Third-party Acquisition Related Costs		1,605,000
Net interest income and non-interest income		7,492,000
Net income		$ 1,808,000