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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Information about reportable segments          
Net interest income $ 78,029 $ 68,306 $ 145,303 $ 135,187  
Provision for loan losses 1,461 2,305 3,289 3,646  
Noninterest revenues 51,226 38,772 95,544 77,053  
Amortization of intangible assets 4,263 1,403 7,031 2,845  
Acquisition expenses 22,896 263 24,612 340  
Other operating expenses 75,720 64,690 144,811 130,840  
Income before income taxes 24,915 38,417 61,104 74,569  
Assets 10,884,046 8,742,111 10,884,046 8,742,111 $ 8,666,437
Goodwill 733,604 465,142 733,604 465,142 $ 465,142
Eliminations [Member]          
Information about reportable segments          
Net interest income 0 0 0 0  
Provision for loan losses 0 0 0 0  
Noninterest revenues (687) (595) (1,351) (1,161)  
Amortization of intangible assets 0 0 0 0  
Acquisition expenses 0 0 0 0  
Other operating expenses (687) (595) (1,351) (1,161)  
Income before income taxes 0 0 0 0  
Assets (43,533) (36,977) (43,533) (36,977)  
Goodwill 0 0 0 0  
Banking [Member] | Operating Segments [Member]          
Information about reportable segments          
Net interest income 77,872 68,220 145,006 135,019  
Provision for loan losses 1,461 2,305 3,289 3,646  
Noninterest revenues 18,062 16,594 33,929 31,907  
Amortization of intangible assets 1,170 691 1,724 1,410  
Acquisition expenses 22,729 31 23,250 99  
Other operating expenses 53,890 47,584 103,383 96,046  
Income before income taxes 16,684 34,203 47,289 65,725  
Assets 10,635,177 8,675,329 10,635,177 8,675,329  
Goodwill 631,148 440,870 631,148 440,870  
Employee Benefit Services [Member] | Operating Segments [Member]          
Information about reportable segments          
Net interest income 94 38 172 77  
Provision for loan losses 0 0 0 0  
Noninterest revenues 21,118 12,067 38,754 24,457  
Amortization of intangible assets 2,343 114 3,933 230  
Acquisition expenses 117 0 1,179 0  
Other operating expenses 13,068 9,432 24,438 18,879  
Income before income taxes 5,684 2,559 9,376 5,425  
Assets 217,020 34,814 217,020 34,814  
Goodwill 84,552 8,018 84,552 8,018  
All Other [Member]          
Information about reportable segments          
Net interest income 63 48 125 91  
Provision for loan losses 0 0 0 0  
Noninterest revenues 12,733 10,706 24,212 21,850  
Amortization of intangible assets 750 598 1,374 1,205  
Acquisition expenses 50 232 183 241  
Other operating expenses 9,449 8,269 18,341 17,076  
Income before income taxes 2,547 1,655 4,439 3,419  
Assets 75,382 68,945 75,382 68,945  
Goodwill $ 17,904 $ 16,254 $ 17,904 $ 16,254