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Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended
Mar. 31, 2019
USD ($)
quarter
operating_segment
division
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Number of Bank Divisions | division 14    
Number of Operating Segments | operating_segment 1    
Total assets $ 12,073,779,000   $ 12,115,484,000
Gross loans $ 8,326,070,000   8,287,549,000
Minimum Period Past Due to Consider Loan as Delinquent 30 days    
Minimum Period Past Due to Consider Loan as Non Accrual 90 days    
Number of Quarters Used to Evaluate Historical Loss Experience | quarter 12    
Maximum Term Leases Will Be Considered Short-term 12 months    
Revenue from Contracts with Customers $ 18,446,000 $ 17,291,000  
Impairment losses on receivables related to contracts with customers 0   $ 0
First Community Bank Utah      
Total assets 328,893,000    
Gross loans 248,725,000    
Total deposits 279,674,000    
Accounting Standards Update 2017-08      
Effect of cumulative change on retained earnings from applying new accounting pronouncement 24,102,000    
Accounting Standards Update 2016-02      
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Assets 36,178,000    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Liabilities $ 38,220,000    
Consumer and Other      
Minimum Number of Days Delinquent to Charge off Loans 120 days    
Minimum Range      
Number of years for home equity loan origination term 10 years    
Maximum Range      
Number of years for home equity loan origination term 15 years