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INVESTMENT SECURITIES - TRUST PREFERRED SECURITY (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Fair Value   $ 458,719,000   $ 481,275,000
Amount of floating rate purchased   91,451,000 $ 400,079,000  
Private label mortgage backed security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Fair Value   4,575,000   4,777,000
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   838,000   1,500,000
Trust preferred security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Fair Value   $ 3,500,000   $ 3,200,000
Amount of floating rate purchased $ 3,000,000      
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%