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Loans and Credit Quality (LHFI table)(Details) - Fair Value Hierarchy [Domain] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Fair Value Disclosure $ 38,224 $ 0  
Loans held for investment      
Loans and Leases Receivable, Gross 2,933,968 2,126,198  
Net deferred loan fees and discounts 7,516 5,048  
Loans held for investment, net of deferred fees and discounts 2,926,452 2,121,150  
Allowance for losses on loans held for investment (25,777) (22,021) $ (21,926)
Loans held for investment 2,900,675 2,099,129  
Residential Mortgage [Member]      
Loans held for investment      
Loans and Leases Receivable, Gross 1,182,542 [1] 896,665  
Consumer Portfolio Segment [Member]      
Loans held for investment      
Loans and Leases Receivable, Gross 1,399,177 1,032,263  
Commercial Portfolio Segment [Member]      
Loans held for investment      
Loans and Leases Receivable, Gross 1,534,791 $ 1,093,935  
Fair Value, Measurements, Recurring [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable, Fair Value Disclosure $ 38,224    
[1] (1)Includes $38.2 million of loans where a fair value option election was made at the time of origination and, therefore, are carried at fair value with changes recognized in the consolidated stat