Mergers and Acquisitions (Details Textual) - Montana Community Banks, Inc.	9 Months Ended
	Sep. 30, 2015 USD ($) shares
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 | shares	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
Core deposit intangible	$ 2,087,000
Core Deposit Intangible Assets, Weighted Average Useful Life	10 years
Third-party Acquisition Related Costs	$ 1,528,000
Net interest income and non-interest income	5,493,000
Net income	$ 866,000