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Share-Based Payment Arrangements (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
entity
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation recognized | $ $ 14,300 $ 12,900 $ 14,000
Recognized tax benefit related to share-based compensation | $ $ 5,200 4,800 4,900
Percentage where an option price is equal to market price 110.00%    
Service period 5 years    
Term of option award vest, contractual term 10 years    
Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options exercised | $ $ 500 20 $ 400
Options [Member] | 2014 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate awards authorized for grant 1,796,357    
Maximum number of shares which may be granted to participant 100,000    
Shares available for future issuance 1,000,000    
Options [Member] | 2010 Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance 108,766    
Restricted and Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense | $ $ 46,100    
Weighted-average period 3 years 7 months 6 days    
Total fair value of shares vested | $ $ 11,500 $ 12,200  
Shares granted 541,008    
Grant date fair value per share | $ / shares $ 36.14    
Executive Management [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period 3 years    
Executive Management [Member] | Performance Shares [Member] | Total Shareholder Return [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 35,587    
Grant date fair value per share | $ / shares $ 24.42    
Vesting performance period 3 years    
Number of peer group regional banks | entity 44    
Percentage of maximum number of shares vested 200.00%    
Executive Management [Member] | Performance Shares [Member] | Core Earnings Per Share [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 35,587    
Grant date fair value per share | $ / shares $ 22.58    
Vesting performance period 2 years