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Business Combinations - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 06, 2016
Mar. 03, 2015
Feb. 26, 2015
Apr. 07, 2015
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Feb. 27, 2015
Business Acquisition [Line Items]                    
Securities transferred in satisfaction of other borrowings               $ 98,316,000    
Repayment of other borrowings               1,659,000    
Business acquisition, bargain purchase gain               12,509,000    
ColoEast Bankshares, Inc.                    
Business Acquisition [Line Items]                    
Total consideration transferred, maximum $ 70,000,000                  
Total consideration transferred, minimum $ 69,000,000                  
Business combination, total assets           $ 759,000,000     $ 759,000,000  
Business combination, total loans           453,000,000     453,000,000  
Business combination, total deposits           664,000,000     664,000,000  
Doral Money Acquisition                    
Business Acquisition [Line Items]                    
Business combination, total assets           151,646,000     151,646,000  
Business combination, total loans           37,665,000     37,665,000  
Business acquisition, percentage of voting interests acquired                   100.00%
CLO management contract acquired - Assets under management   $ 700,000,000                
Business combination, consideration transferred cash paid   133,263,000                
Business combination, sales price adjustment   2,601,000                
Total consideration transferred       $ 135,864,000         135,864,000  
Business acquisition, bargain purchase gain                 15,117,000  
Pre-tax expenses               243,000    
Gain (loss) on sale of loans               $ 0    
Doral Money Acquisition | Measurement Period Adjustments                    
Business Acquisition [Line Items]                    
Business combination, total assets           2,588,000     2,588,000  
Business combination, total loans           900,000     900,000  
Business acquisition, bargain purchase gain           $ 900,000 $ 1,708,000   $ 2,608,000  
Doral Money Acquisition | Secured term loan credit facility                    
Business Acquisition [Line Items]                    
Other borrowings payable to third party     $ 99,975,000              
Debt instrument maturity date     Mar. 31, 2015              
Repayment of debt instrument   99,975,000                
Securities transferred in satisfaction of other borrowings   98,316,000                
Repayment of other borrowings   $ 1,659,000                
Doral Money Acquisition | Secured term loan credit facility | London Interbank Offered Rate (LIBOR)                    
Business Acquisition [Line Items]                    
Debt instrument, marginal interest rate     3.50%              
Debt instrument, interest rate description         LIBOR plus 3.5%