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Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
6 Months Ended
Jun. 30, 2017
USD ($)
quarter
step
operating_segment
division
$ / shares
Dec. 31, 2016
USD ($)
Number of Bank Divisions | division 14  
Number of Operating Segments | operating_segment 1  
Total assets $ 9,899,494,000 $ 9,450,600,000
Gross loans $ 6,345,762,000 $ 5,684,463,000
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  
Period to begin developing and implementing processes and procedures for FASB Update 2 years  
Effect of change on net income from applying new accounting pronouncement $ 538,000  
Effect of change on diluted earnings per share from applying new accounting pronouncement | $ / shares $ 0.01  
Maximum lease term to not recognize lease assets and liabilities 12 months  
Number of Steps to Achieve Core Revenue Recognition Principal | step 5  
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  
Collegiate Peaks Bank    
Total assets $ 466,356,000  
Gross loans 336,608,000  
Total deposits $ 398,605,000