Mergers and Acquisitions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition
Bargain purchase gain, amount	$ 0	$ 680,000	$ 0
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
Loans Receivable Acquired, Gross Principal and Contractual Interest Due, Expected to be Uncollectible	0
Core deposit intangible	$ 4,532,000
Core Deposit Intangible Assets, Weighted Average Useful Life	10 years
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
Loans Receivable Acquired, Gross Principal and Contractual Interest Due, Expected to be Uncollectible	0
Core deposit intangible	$ 2,087,000
Core Deposit Intangible Assets, Weighted Average Useful Life	10 years
Third-party Acquisition Related Costs	$ 1,605,000
Net interest income and non-interest income	7,492,000
Net income	$ 1,808,000
FNBR Holding Corporation
Business Acquisition
Effective Date of Acquisition		Aug. 31, 2014
Percentage of Outstanding Common Stock Acquired		100.00%
Business Combination, Consideration Transferred		$ 31,817,000
Number of Shares Issued for Aquisition		555,732
Cash consideration for outstanding shares		$ 16,690,000
Bargain purchase gain, amount		680,000
Loans receivable		137,488,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		146,019,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due, Expected to be Uncollectible		0
Core deposit intangible		$ 4,199,000
Core Deposit Intangible Assets, Weighted Average Useful Life		10 years
Third-party Acquisition Related Costs		$ 552,000
Net interest income and non-interest income		6,672,000
Net income		$ 1,675,000