Note 3 - Business Combinations - Assets Acquired and Liabilities Assumed at Acquisition Date (Details) - USD ($)
$ in Thousands
Jan. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Recognized amounts of identifiable assets acquired and liabilities assumed:        
Goodwill   $ 63,317 $ 29,197 $ 29,240
First Capital Bancorp [Member]        
Consideration Paid        
Payments to Acquire Businesses, Gross $ 25,834      
Fair value of shares issued 61,313      
Business Combination, Consideration Transferred 87,147      
Recognized amounts of identifiable assets acquired and liabilities assumed:        
Cash and cash equivalents 13,767      
Securities 77,473      
Nonmarketable equity securities 4,188      
Loans, net of allowance 500,209      
Premises and equipment 11,306      
Core deposit intangibles 3,700      
Interest receivable 1,856      
Bank owned life insurance 10,216      
Deferred tax asset 3,006      
Other assets 2,779      
Total assets acquired 628,500      
Deposits 507,743      
Federal Home Loan Bank advances 45,503      
Junior Subordinated Debt 8,591      
Short term borrowings 7,621      
Other liabilities 6,014      
Total liabilities assumed 575,472      
Total identifiable assets 53,028      
Goodwill 34,119 $ 34,120 $ 0 $ 0
First Capital Bancorp [Member] | As Recorded by Acquiree [Member]        
Recognized amounts of identifiable assets acquired and liabilities assumed:        
Cash and cash equivalents 13,767      
Securities 77,404      
Nonmarketable equity securities 4,161      
Loans, net of allowance 500,265      
Premises and equipment 11,699      
Core deposit intangibles 0      
Interest receivable 1,856      
Bank owned life insurance 10,216      
Deferred tax asset 3,956      
Other assets 2,962      
Total assets acquired 626,286      
Deposits 506,060      
Federal Home Loan Bank advances 45,000      
Junior Subordinated Debt 9,963      
Short term borrowings 7,621      
Other liabilities 5,994      
Total liabilities assumed 574,638      
Total identifiable assets 51,648      
Goodwill 0      
First Capital Bancorp [Member] | Fair Value and Other Merger Related Adjustments [Member]        
Recognized amounts of identifiable assets acquired and liabilities assumed:        
Cash and cash equivalents 0      
Securities 69      
Nonmarketable equity securities 27      
Loans, net of allowance (56)      
Premises and equipment (393)      
Core deposit intangibles 3,700      
Interest receivable 0      
Bank owned life insurance 0      
Deferred tax asset (950)      
Other assets (183)      
Total assets acquired 2,214      
Deposits 1,683      
Federal Home Loan Bank advances 503      
Junior Subordinated Debt (1,372)      
Short term borrowings 0      
Other liabilities 20      
Total liabilities assumed 834      
Total identifiable assets 1,380      
Goodwill $ 0