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Subordinated Debentures - Schedule of Convertible Note (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 20, 2018
Jun. 07, 2018
Apr. 26, 2018
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
May 11, 2018
Debt Instrument [Line Items]                      
Proceeds from convertible notes, net of issuance fees             $ 212,920,000 $ 0 $ 0    
Repurchase of treasury stock       $ 50,000,000 $ 100,000,000   $ 150,000,000        
Common stock repurchased and recorded as treasury stock (in shares)       3,436,757   5,565,696 9,000,000        
Weighted average price of repurchased shares (in dollars per share)             $ 16.65        
Convertible Notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount issued                   $ 217,500,000.0 $ 200,000,000
Initial Rate                     2.00%
Additional face amount issued as part of initial offering over-allotment option   $ 17,500,000.0                  
Initial conversion rate   0.0450760                  
Initial conversion price (in dollars per share)   $ 22.18                  
Premium percentage to closing stock price on date of pricing of the notes   22.50%                  
Call option, percentage of principal amount in cash   100.00%                  
Amount of proceeds from convertible notes authorized for repurchase of common stock   100.00%                  
Proceeds from convertible notes, net of issuance fees $ 50,000,000.0   $ 100,000,000.0                
Proceeds from convertible notes, net of issuance fees     213,200,000                
Proceeds down-streamed to the Bank as equity     113,200,000                
Repurchase of treasury stock     $ 76,000,000       $ 150,000,000        
Closing price of common stock (in dollars per share)     $ 18.11                
Discount rate   4.25%                  
Amortization/ Capitalization Period   5 years         5 years        
Gross Carrying Amount                      
Convertible notes principal balance       $ 217,500,000     $ 217,500,000        
Discount       (21,880,000)     (21,880,000)        
Issuance costs to be capitalized       (4,119,000)     (4,119,000)        
Carrying balance of convertible notes       191,501,000     191,501,000        
Accumulated Amortization / Capitalization                      
Discount       2,544,000     2,544,000        
Issuance costs to be capitalized       498,000     498,000        
Carrying balance of convertible notes       3,042,000     3,042,000        
Carrying Amount                      
Discount       (19,336,000)     (19,336,000)        
Issuance costs to be capitalized       (3,621,000)     (3,621,000)        
Carrying balance of convertible notes       $ 194,543,000     194,543,000        
Interest expense on convertible notes             $ 5,800,000