Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - Narrative (Details)

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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2018
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]              
Cash paid in acquisition         $ 10,928 $ 0  
Merger-related costs     $ 8,273 $ 2,744 35,985 $ 2,744  
Goodwill     $ 725,195   $ 725,195   $ 298,528
Xenith              
Business Acquisition [Line Items]              
Number of shares equivalent to each share of acquired entity   0.9354          
Number of common shares issued   21,922,077          
Consideration transferred, fair value   $ 794,809          
Cash paid in acquisition   6,170          
Fair value of total consideration transferred   800,979          
Goodwill   424,148          
Acquired amortizable intangible assets   38,470          
DHFB              
Business Acquisition [Line Items]              
Cash paid in acquisition $ 4,800            
Carrying value of assets managed 600,000            
Fair value of total consideration transferred 7,400            
Goodwill 3,400            
Acquired amortizable intangible assets $ 4,300            
Performing | Xenith              
Business Acquisition [Line Items]              
Acquired performing loans, fair value   2,400,000          
Contractually required principal and interest payments   2,700,000          
Contractual cash flows not expected to be collected   20,600          
Nonperforming | Xenith              
Business Acquisition [Line Items]              
Fair value of loans acquired with a deterioration of credit quality   78,885          
Contractually required principal and interest payments   $ 113,891          
Minimum | DHFB              
Business Acquisition [Line Items]              
Acquired amortizable assets, useful life 5 years            
Maximum | DHFB              
Business Acquisition [Line Items]              
Acquired amortizable assets, useful life 15 years