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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 3    
SEGMENT INFORMATION      
Net interest income (expense) $ 39,211 $ 36,235  
Provision (credit) for loan and lease losses (747) (2,747)  
Other operating income 10,165 11,190  
Other operating expense (32,875) (34,018)  
Income before income taxes 17,248 16,154  
Income tax (expenses) benefit (6,067) (5,759)  
Net income 11,181 10,395  
Investment securities 1,540,773   $ 1,520,172
Total Assets 5,242,202   5,131,288
Banking Operations      
SEGMENT INFORMATION      
Net income 14,012 13,273  
Total Assets 3,379,187   3,300,604
Treasury      
SEGMENT INFORMATION      
Net income 910 (36)  
Total Assets 1,776,571   1,746,344
All Others      
SEGMENT INFORMATION      
Net income (3,741) (2,842)  
Total Assets 86,444   84,340
Intersegment elimination      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Intersegment elimination | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 10,558 10,302  
Intersegment elimination | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) (7,017) (8,698)  
Intersegment elimination | All Others      
SEGMENT INFORMATION      
Net interest income (expense) (3,541) (1,604)  
Operating segments      
SEGMENT INFORMATION      
Net interest income (expense) 39,211 36,235  
Provision (credit) for loan and lease losses 747 2,747  
Other operating income 10,165 11,190  
Other operating expense (32,875) (34,018)  
Administrative and overhead expense allocation 0 0  
Income before income taxes 17,248 16,154  
Income tax (expenses) benefit (6,067) (5,759)  
Investment securities 1,540,773   1,520,172
Loans and leases (including loans held for sale) 3,320,238   3,225,641
Other 381,191   385,475
Operating segments | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 30,951 27,854  
Provision (credit) for loan and lease losses 747 2,747  
Other operating income 5,534 6,446  
Other operating expense (14,743) (14,824)  
Administrative and overhead expense allocation (11,432) (12,104)  
Income before income taxes 21,615 20,421  
Income tax (expenses) benefit (7,603) (7,148)  
Investment securities 0   0
Loans and leases (including loans held for sale) 3,320,238   3,225,641
Other 58,949   74,963
Operating segments | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) 8,260 8,381  
Provision (credit) for loan and lease losses 0 0  
Other operating income 745 1,027  
Other operating expense (388) (478)  
Administrative and overhead expense allocation (196) (288)  
Income before income taxes 1,404 (56)  
Income tax (expenses) benefit (494) 20  
Investment securities 1,540,773   1,520,172
Loans and leases (including loans held for sale) 0   0
Other 235,798   226,172
Operating segments | All Others      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Provision (credit) for loan and lease losses 0 0  
Other operating income 3,886 3,717  
Other operating expense (17,744) (18,716)  
Administrative and overhead expense allocation 11,628 12,392  
Income before income taxes (5,771) (4,211)  
Income tax (expenses) benefit 2,030 $ 1,369  
Investment securities 0   0
Loans and leases (including loans held for sale) 0   0
Other $ 86,444   $ 84,340