Mergers and Acquisitions Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Liabilities assumed
Goodwill recognized		$ 0	$ 6,415,000	$ 30,758,000	$ 6,415,000
The Foothills Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs				46,673,000
Cash consideration for outstanding shares				17,342,000
Contingent consideration				0
Total fair value of consideration transferred				64,015,000
Identifiable assets acquired
Cash and cash equivalents		13,251,000		13,251,000
Investment securities		25,420,000		25,420,000
Loans receivable		292,529,000		292,529,000
Core deposit intangible	[1]	4,331,000		4,331,000
Accrued income and other assets		19,699,000		19,699,000
Total identifiable assets acquired		355,230,000		355,230,000
Liabilities assumed
Deposits		296,760,000		296,760,000
FHLB advances		22,800,000		22,800,000
Accrued expenses and other liabilities		2,264,000		2,264,000
Total liabilities assumed		321,824,000		321,824,000
Total identifiable net assets		$ 33,406,000		33,406,000
Goodwill recognized				$ 30,609,000
Core Deposit Intangible, Weighted Average Useful Life				10 years

[1] The core deposit intangible for this acquisition was determined to have an estimated life of 10 years.