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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Investments in pooled trust preferred securities      
Amortized Cost $ 1,106,028 $ 674,104 $ 2,946
Fair Value 1,088,779 671,488  
Trust preferred securities      
Investments in pooled trust preferred securities      
Amortized Cost 12,402 12,442  
Fair Value 10,401 $ 9,388  
Unrealized Loss (2,001)    
XXIII      
Investments in pooled trust preferred securities      
Amortized Cost 8,313    
Fair Value 6,751    
Unrealized Loss $ (1,562)    
Issuers Currently in Deferral or Default 16.00%    
XXVI      
Investments in pooled trust preferred securities      
Amortized Cost $ 4,089    
Fair Value 3,650    
Unrealized Loss $ (439)    
Issuers Currently in Deferral or Default 19.00%