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INVESTMENT SECURITIES - TRUST PREFERRED SECURITY (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2015
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Amount of floating rate purchased $ 159,880 $ 91,451    
Private label mortgage backed security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Securities not due at a single maturity date 3,849      
Mortgage backed securities and CMOs        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Gross unrealized losses on available for sale securities $ 3,800   $ 1,900  
Trust preferred security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Amount of floating rate purchased       $ 3,000
Price as percentage of face value       68.00%
3 Month London Interbank Offered Rate (LIBOR) | Trust preferred security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Interest rate - Basis Spread       1.59%