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Qualifying Debt Junior Subordinated Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Debt Instrument [Line Items]        
Subordinated Debt Obligations, Fair Value Disclosure $ 46,928 $ 40,437    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 58,370 40,437    
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust (6,085) 0   $ 6,200
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (6,523) $ 1,380 $ (5,900)  
Long-term Debt, Weighted Average Interest Rate   1.06%    
Bridge Capital Trust I [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 12,372 $ 0    
Bridge Capital Trust II [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust $ 5,155 $ 0    
Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Weighted Average Interest Rate 2.95% 2.73%    
Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Subordinated Debt Obligations, Fair Value Disclosure $ 46,928 $ 40,437    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 66,497 66,497    
Unrealized gain or loss on junior subordinated debt [Line Items] (19,569) (26,060)    
Junior Subordinated Debt [Member] | BankWest Nevada Capital Trust II [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 15,464 15,464    
Junior Subordinated Debt [Member] | Intermountain First Statutory Trust I [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 10,310 10,310    
Junior Subordinated Debt [Member] | First Independent Capital Trust I [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 7,217 7,217    
Junior Subordinated Debt [Member] | WAL Trust No. 1 [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 20,619 20,619    
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 2 [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 5,155 5,155    
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 3 [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 7,732 7,732    
Bridge Capital Holdings [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 17,527 0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt 11,442 0   $ 11,287
Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ (6,491) $ 1,421 $ (5,640)