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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | segment     3    
SEGMENT INFORMATION          
Net interest income (expense) $ 41,995 $ 39,426 $ 124,879 $ 118,246  
Other operating income 9,569 9,954 27,453 28,547  
Other operating expense (33,511) (32,265) (97,306) (96,091)  
Income before income taxes 18,179 17,858 57,514 53,574  
Income tax (expenses) benefit (6,367) (6,392) (20,598) (18,790)  
Net income 11,812 11,466 36,916 34,784  
Investment securities 1,547,777   1,547,777   $ 1,461,515
Total Assets 5,569,230   5,569,230   5,384,236
Banking Operations          
SEGMENT INFORMATION          
Net income 12,005 11,547 37,589 37,201  
Total Assets 3,691,567   3,691,567   3,613,253
Treasury          
SEGMENT INFORMATION          
Net income 655 272 1,226 2,159  
Total Assets 1,797,412   1,797,412   1,702,902
All Others          
SEGMENT INFORMATION          
Net income (848) (353) (1,899) (4,576)  
Total Assets 80,251   80,251   68,081
Intersegment elimination          
SEGMENT INFORMATION          
Net interest income (expense) 0 0 0 0  
Intersegment elimination | Banking Operations          
SEGMENT INFORMATION          
Net interest income (expense) 8,530 8,588 24,618 28,581  
Intersegment elimination | Treasury          
SEGMENT INFORMATION          
Net interest income (expense) (6,299) (6,398) (18,828) (20,315)  
Intersegment elimination | All Others          
SEGMENT INFORMATION          
Net interest income (expense) (2,231) (2,190) (5,790) (8,266)  
Operating segments          
SEGMENT INFORMATION          
Net interest income (expense) 41,995 39,426 124,879 118,246  
Provision (credit) for loan and lease losses 126 743 2,488 2,872  
Other operating income 9,569 9,954 27,453 28,547  
Other operating expense (33,511) (32,265) (97,306) (96,091)  
Administrative and overhead expense allocation 0 0 0 0  
Income before income taxes 18,179 17,858 57,514 53,574  
Income tax (expenses) benefit (6,367) (6,392) (20,598) (18,790)  
Investment securities 1,547,777   1,547,777   1,461,515
Loans and leases (including loans held for sale) 3,647,198   3,647,198   3,556,771
Other 374,255   374,255   365,950
Operating segments | Banking Operations          
SEGMENT INFORMATION          
Net interest income (expense) 35,191 32,583 103,839 95,519  
Provision (credit) for loan and lease losses 126 743 2,488 2,872  
Other operating income 5,505 6,833 17,073 18,860  
Other operating expense (15,242) (15,875) (45,095) (45,522)  
Administrative and overhead expense allocation (15,635) (14,873) (44,360) (43,014)  
Income before income taxes 18,475 17,999 58,563 57,296  
Income tax (expenses) benefit (6,470) (6,452) (20,974) (20,095)  
Investment securities 0   0   0
Loans and leases (including loans held for sale) 3,647,198   3,647,198   3,556,771
Other 44,369   44,369   56,482
Operating segments | Treasury          
SEGMENT INFORMATION          
Net interest income (expense) 6,804 6,843 21,040 22,727  
Provision (credit) for loan and lease losses 0 0 0 0  
Other operating income 1,159 652 1,487 2,794  
Other operating expense (338) (410) (1,048) (1,237)  
Administrative and overhead expense allocation (311) (253) (741) (643)  
Income before income taxes 1,015 434 1,910 3,326  
Income tax (expenses) benefit (360) (162) (684) (1,167)  
Investment securities 1,547,777   1,547,777   1,461,515
Loans and leases (including loans held for sale) 0   0   0
Other 249,635   249,635   241,387
Operating segments | All Others          
SEGMENT INFORMATION          
Net interest income (expense) 0 0 0 0  
Provision (credit) for loan and lease losses 0 0 0 0  
Other operating income 2,905 2,469 8,893 6,893  
Other operating expense (17,931) (15,980) (51,163) (49,332)  
Administrative and overhead expense allocation 15,946 15,126 45,101 43,657  
Income before income taxes (1,311) (575) (2,959) (7,048)  
Income tax (expenses) benefit 463 $ 222 1,060 $ 2,472  
Investment securities 0   0   0
Loans and leases (including loans held for sale) 0   0   0
Other $ 80,251   $ 80,251   $ 68,081