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Investment Securities - Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
investmentSecurity
Dec. 31, 2020
USD ($)
investmentSecurity
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Investment Securities        
Accumulated other comprehensive income (loss) before tax amount $ (21,300,000) $ 84,400,000    
Accumulated other comprehensive income (loss), net of tax (15,189,000) 60,292,000    
Available-for-sale securities acquired 364,542,000     $ 104,725,000
Available-for-sale securities, provision for credit losses $ 0 $ 0   0
Available-for-sale and held-to-maturity securities in nonaccrual status | investmentSecurity 0 0    
Available-for-sale and held-to-maturity securities purchased with deterioration in credit quality | investmentSecurity 0 0    
Available-for-sale and held-to-maturity collateral dependant | investmentSecurity 0 0    
Gross gains $ 4,200,000 $ 5,300,000   8,000,000.0
Gross losses 191,000 285,000   204,000
Proceeds from available-for-sale securities 179,400,000 207,600,000   97,900,000
Investment securities pledged 128,100,000 147,300,000    
FHLB stock 17,300,000      
FRB stock 74,500,000      
Other stock 26,100,000      
Amount of stock repurchased by FHLB 0 $ 0   $ 0
Impairment loss on investments in FHLB, FRB and other stock $ 0      
Opus Bank        
Investment Securities        
Available-for-sale securities acquired     $ 829,900,000  
Allowance for credit losses of available-for-sale securities classified as purchase credit deteriorated     0  
Opus Bank | Financial Asset Acquired with Credit Deterioration        
Investment Securities        
Available-for-sale securities acquired     $ 0