Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Liabilities assumed
Goodwill recognized	$ 0	$ 0	$ 1,137	$ 0
Montana Community Banks, Inc.
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs			10,776
Cash consideration for outstanding shares			12,219
Contingent consideration			0
Total fair value of consideration transferred			22,995
Identifiable assets acquired
Cash and cash equivalents	31,931		31,931
Investment securities	42,350		42,350
Loans receivable	84,689		84,689
Core deposit intangible	2,087		2,087
Accrued income and other assets	13,580		13,580
Total identifiable assets acquired	174,637		174,637
Liabilities assumed
Deposits	146,820		146,820
FHLB advances and repurchase agreements	3,292		3,292
Accrued expenses and other liabilities	2,667		2,667
Total liabilities assumed	152,779		152,779
Total identifiable net assets	$ 21,858		21,858
Goodwill recognized			$ 1,137