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Qualifying Debt Junior Subordinated Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Subordinated Debt Obligations, Fair Value Disclosure $ 67.4 $ 65.9
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 80.7 78.9
Unrealized gain or loss on junior subordinated debt [Line Items] (0.9) (0.6)
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust (4.2) (4.5)
BankWest Nevada Capital Trust II [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 15.5 15.5
Intermountain First Statutory Trust I [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 10.3 10.3
First Independent Capital Trust I [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 7.2 7.2
WAL Trust No. 1 [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 20.6 20.6
WAL Statutory Trust No. 2 [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 5.2 5.2
WAL Statutory Trust No. 3 [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 7.7 7.7
Bridge Capital Trust I [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 12.4 12.4
Bridge Capital Trust II [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust $ 5.1 $ 5.1
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.55% 2.58%
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Subordinated Debt Obligations, Fair Value Disclosure $ 67.4 $ 65.9
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 66.5 66.5
Bridge Capital Holdings [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 17.5 17.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt $ 13.3 $ 13.0