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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
INVESTMENT SECURITIES          
Available-for-sale Securities, Sold at Par $ 97,700 $ 119,400      
Held-to-maturity Securities     $ 191,753 $ 217,668  
Held-to-maturity Securities, Fair Value     189,201 214,366  
Available for Sale, Amortized Cost          
Due in one year or less     8,796    
Due after one year through five years     165,356    
Due after five years through ten years     40,762    
Due after ten years     62,836    
Mortgage-backed securities     1,307,427 1,246,728  
Other     686    
Total     1,307,427    
Available for Sale, Estimated Fair Value          
Due in one year or less     8,799    
Due after one year through five years     166,447    
Due after five years through ten years     41,166    
Due after ten years     63,157    
Other     825    
Available-for-sale, at fair value     1,304,891 1,243,847  
Available for sale          
Gross proceeds from sale of available for sale investment securities     114,536 0 $ 117,496
Purchases of investment securities available for sale $ 97,400 $ 120,600 356,887 195,456 $ 344,766
Available-for-sale Securities, Average Term of Securities Sold 3 years 3 months 24 days        
Available-for-sale Securities, Average Yield of Securities Sold 1.91%        
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds $ 96,000        
Available-for-sale Securities, Average Term of Securities Acquired 4 years 6 months 24 days        
Available-for-sale Securities, Average Yield of Securities Acquired 2.57%        
Available-for-sale Securities, Gross Realized Losses $ 1,600        
Average net yield of available for sale mortgage backed securities sold   1.35%      
Weighted average life of available for sale mortgage backed securities sold   4 years 4 months 24 days      
Net realized gains on the sales of the available for sale investment securities   $ 1,900      
Investment securities pledged to party with no right to sell or repledge the collateral     $ 1,080,000 $ 1,050,000  
Number of investment securities in an unrealized loss position | security     223 242  
Residential-U.S. Government sponsored entities          
INVESTMENT SECURITIES          
Held-to-maturity Securities     $ 100,279    
Held-to-maturity Securities, Fair Value     98,163 $ 121,700  
Available for Sale, Amortized Cost          
Mortgage-backed securities     808,242 775,803  
Available for Sale, Estimated Fair Value          
Available-for-sale, at fair value     800,683 769,986  
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]          
INVESTMENT SECURITIES          
Held-to-maturity Securities       124,082  
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     800,683    
Non Agency Commercial Mortgage Backed Securities and Corporate Bond Securities          
Available for sale          
Average net yield of available for sale mortgage backed securities sold   2.71%      
Weighted average life of available for sale mortgage backed securities sold   7 years 7 months 6 days      
Commercial-U.S. Government sponsored entities          
INVESTMENT SECURITIES          
Held-to-maturity Securities     91,474    
Held-to-maturity Securities, Fair Value     91,038 92,666  
Available for Sale, Amortized Cost          
Mortgage-backed securities     135,058 135,248  
Available for Sale, Estimated Fair Value          
Available-for-sale, at fair value     137,326 137,224  
Mortgage-backed Securities, Issued by Private Enterprises, Residential [Member]          
Available for Sale, Amortized Cost          
Mortgage-backed securities     45,679 51,681  
Available for Sale, Estimated Fair Value          
Available-for-sale, at fair value     46,763 $ 51,547  
Commercial-U.S. Government agencies and sponsored entities          
Available for Sale, Amortized Cost          
Mortgage-backed securities     40,012    
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     46,763    
Available-for-sale, at fair value     39,725    
Mortgage Backed Securities Residential Non Government Agencies [Member]          
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     39,725    
Mortgage Backed Securities Commercial Non Government Agencies [Member]          
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     $ 137,326