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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Information about reportable segments          
Net interest income $ 68,463 $ 62,363 $ 203,650 $ 183,431  
Provision for loan losses 1,790 1,906 5,436 3,120  
Noninterest revenues 39,952 31,386 117,005 90,151  
Amortization of intangible assets 1,359 843 4,204 2,642  
Other operating expenses 64,867 55,236 196,047 165,433  
Income before income taxes 40,399 35,764 114,968 102,387  
Assets 8,727,746 7,997,166 8,727,746 7,997,166 $ 8,552,669
Goodwill 465,142 375,174 465,142 375,174 $ 463,252
Eliminations [Member]          
Information about reportable segments          
Net interest income 0 0 0 0  
Provision for loan losses 0 0 0 0  
Noninterest revenues (623) (526) (1,784) (1,462)  
Amortization of intangible assets 0 0 0 0  
Other operating expenses (623) (526) (1,784) (1,462)  
Income before income taxes 0 0 0 0  
Assets (39,415) (23,058) (39,415) (23,058)  
Goodwill 0 0 0 0  
Banking [Member] | Operating Segments [Member]          
Information about reportable segments          
Net interest income 68,375 62,295 203,394 183,243  
Provision for loan losses 1,790 1,906 5,436 3,120  
Noninterest revenues 17,756 15,503 49,663 43,037  
Amortization of intangible assets 665 680 2,075 2,129  
Other operating expenses 47,738 43,790 143,882 131,002  
Income before income taxes 35,938 31,422 101,664 90,029  
Assets 8,658,308 7,970,345 8,658,308 7,970,345  
Goodwill 440,870 364,495 440,870 364,495  
Employee Benefit Services [Member] | Operating Segments [Member]          
Information about reportable segments          
Net interest income 39 37 117 102  
Provision for loan losses 0 0 0 0  
Noninterest revenues 11,680 11,674 36,137 34,633  
Amortization of intangible assets 96 125 326 391  
Other operating expenses 9,020 8,644 27,899 26,052  
Income before income taxes 2,603 2,942 8,029 8,292  
Assets 36,706 30,958 36,706 30,958  
Goodwill 8,019 8,019 8,019 8,019  
All Other [Member]          
Information about reportable segments          
Net interest income 49 31 139 86  
Provision for loan losses 0 0 0 0  
Noninterest revenues 11,139 4,735 32,989 13,943  
Amortization of intangible assets 598 38 1,803 122  
Other operating expenses 8,732 3,328 26,050 9,841  
Income before income taxes 1,858 1,400 5,275 4,066  
Assets 72,147 18,921 72,147 18,921  
Goodwill $ 16,253 $ 2,660 $ 16,253 $ 2,660