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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 3    
SEGMENT INFORMATION      
Net interest income (expense) $ 41,255 $ 39,211  
Provision (credit) for loan and lease losses 80 747  
Other operating income 10,014 8,656  
Other operating expense (31,460) (31,366)  
Income before income taxes 19,889 17,248  
Income tax (expenses) benefit (6,810) (6,067)  
Net income 13,079 11,181  
Investment securities 1,514,315   $ 1,461,515
Total Assets 5,443,181   5,384,236
Banking Operations      
SEGMENT INFORMATION      
Net income 12,559 11,243  
Total Assets 3,599,798   3,613,253
Treasury      
SEGMENT INFORMATION      
Net income 1,082 913  
Total Assets 1,766,598   1,702,902
All Others      
SEGMENT INFORMATION      
Net income (562) (975)  
Total Assets 76,785   68,081
Intersegment elimination      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Intersegment elimination | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 7,927 10,558  
Intersegment elimination | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) (6,190) (7,017)  
Intersegment elimination | All Others      
SEGMENT INFORMATION      
Net interest income (expense) (1,737) (3,541)  
Operating segments      
SEGMENT INFORMATION      
Net interest income (expense) 41,255 39,211  
Provision (credit) for loan and lease losses 80 747  
Other operating income 10,014 8,656  
Other operating expense (31,460) (31,366)  
Administrative and overhead expense allocation 0 0  
Income before income taxes 19,889 17,248  
Income tax (expenses) benefit (6,810) (6,067)  
Investment securities 1,514,315   1,461,515
Loans and leases (including loans held for sale) 3,555,623   3,556,771
Other 373,243   365,950
Operating segments | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 34,090 30,951  
Provision (credit) for loan and lease losses 80 747  
Other operating income 5,724 5,534  
Other operating expense (15,018) (14,743)  
Administrative and overhead expense allocation (13,704) (15,750)  
Income before income taxes 19,099 17,297  
Income tax (expenses) benefit (6,540) (6,054)  
Investment securities 0   0
Loans and leases (including loans held for sale) 3,555,623   3,556,771
Other 44,175   56,482
Operating segments | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) 7,165 8,260  
Provision (credit) for loan and lease losses 0 0  
Other operating income 1,261 745  
Other operating expense (388) (388)  
Administrative and overhead expense allocation (202) (196)  
Income before income taxes 1,646 1,404  
Income tax (expenses) benefit (564) (491)  
Investment securities 1,514,315   1,461,515
Loans and leases (including loans held for sale) 0   0
Other 252,283   241,387
Operating segments | All Others      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Provision (credit) for loan and lease losses 0 0  
Other operating income 3,029 2,377  
Other operating expense (16,054) (16,235)  
Administrative and overhead expense allocation 13,906 15,946  
Income before income taxes (856) (1,453)  
Income tax (expenses) benefit 294 $ 478  
Investment securities 0   0
Loans and leases (including loans held for sale) 0   0
Other $ 76,785   $ 68,081