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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Information about reportable segments [Abstract]      
Net interest income $ 315,675 $ 273,896 $ 248,420
(Benefit)/provision for loan losses 10,984 8,076 6,447
Noninterest income 202,423 155,625 123,299
Amortization of intangible assets 16,941 5,479 3,663
Acquisition expenses 25,986 1,706 7,037
Other operating expenses 304,222 259,663 222,355
Income before income taxes 159,965 154,597 132,217
Assets 10,746,198 8,666,437 8,552,669
Goodwill 734,430 465,142 463,252
Eliminations [Member]      
Information about reportable segments [Abstract]      
Net interest income 0 0 0
(Benefit)/provision for loan losses 0 0 0
Noninterest income (2,858) (2,442) (2,156)
Amortization of intangible assets 0 0 0
Acquisition expenses 0 0 0
Other operating expenses (2,858) (2,442) (2,156)
Income before income taxes 0 0 0
Assets (29,638) (41,790) (65,637)
Goodwill 0 0 0
Banking [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 315,025 273,542 248,167
(Benefit)/provision for loan losses 10,984 8,076 6,447
Noninterest income 73,337 66,059 57,704
Amortization of intangible assets 5,296 2,682 2,803
Acquisition expenses 24,549 1,005 6,947
Other operating expenses 218,608 190,263 174,918
Income before income taxes 128,925 137,575 114,756
Assets 10,505,919 8,598,057 8,513,228
Goodwill 629,916 440,870 439,052
Employee Benefit Services [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 396 162 132
(Benefit)/provision for loan losses 0 0 0
Noninterest income 82,743 48,261 46,784
Amortization of intangible assets 8,578 420 515
Acquisition expenses 1,194 445 21
Other operating expenses 51,138 36,892 35,197
Income before income taxes 22,229 10,666 11,183
Assets 203,369 38,742 35,011
Goodwill 84,449 8,019 8,019
All Other [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 254 192 121
(Benefit)/provision for loan losses 0 0 0
Noninterest income 49,201 43,747 20,967
Amortization of intangible assets 3,067 2,377 345
Acquisition expenses 243 256 69
Other operating expenses 37,334 34,950 14,396
Income before income taxes 8,811 6,356 6,278
Assets 66,548 71,428 70,067
Goodwill $ 20,065 $ 16,253 $ 16,181