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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, 2016
Sep. 30, 2015
Dec. 31, 2015
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Amount of floating rate   $ 400,079,000 $ 994,305,000  
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   $ 268,000   $ 1,100,000
Trust preferred security        
Amortized cost and fair value of the investment securities portfolio by contractual maturity        
Amount of floating rate $ 3,000,000      
Price as percentage of face value 68.00%      
Weighted average yield (as a percent) 4.27%     4.27%
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%     1.59%