Mergers and Acquisitions Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($)			3 Months Ended		6 Months Ended
		Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Liabilities assumed
Goodwill recognized			$ 41,301,000	$ 0	$ 41,301,000	$ 111,724,000
First Community Bank Utah
Fair value of consideration transferred
Fair value of Company shares issued		$ 87,153,000
Cash		4,000
Total fair value of consideration transferred		87,157,000
Identifiable assets acquired
Cash and cash equivalents		11,311,000
Debt securities		47,247,000
Loans receivable		245,485,000
Core deposit intangible	[1]	8,963,000
Accrued income and other assets		24,848,000
Total identifiable assets acquired		337,854,000
Liabilities assumed
Deposits		274,646,000
Borrowings	[2]	7,273,000
Accrued expenses and other liabilities		10,079,000
Total liabilities assumed		291,998,000
Total identifiable net assets		45,856,000
Goodwill recognized		$ 41,301,000
Core Deposit Intangible, Weighted Average Useful Life		10 years
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures		$ 5,864,000

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

[2] Borrowings assumed with the acquisition include Tier 1 subordinated debentures of $5,864,000.