v2.4.0.8
SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Information about reportable segments      
Net interest income $ 60,108 $ 58,425  
Provision for loan losses 1,000 1,393  
Noninterest income 28,354 26,109  
Amortization of intangible assets 1,141 1,179  
Other operating expenses 54,780 53,373  
Income before income taxes 31,541 28,589  
Assets 7,397,228 7,221,073 7,095,864
Goodwill 375,174 369,703 374,991
Eliminations [Member]
      
Information about reportable segments      
Net interest income 0 0  
Provision for loan losses 0 0  
Noninterest income (474) (451)  
Amortization of intangible assets 0 0  
Other operating expenses (474) (451)  
Income before income taxes 0 0  
Assets (18,064) (20,326)  
Goodwill 0 0  
Banking [Member]
      
Information about reportable segments      
Net interest income 60,063 58,374  
Provision for loan losses 1,000 1,393  
Noninterest income 13,444 12,641  
Amortization of intangible assets 912 937  
Other operating expenses 43,711 43,231  
Income before income taxes 27,884 25,454  
Assets 7,370,190 7,196,264  
Goodwill 364,495 359,207  
Employee Benefit Services Member [Member]
      
Information about reportable segments      
Net interest income 23 31  
Provision for loan losses 0 0  
Noninterest income 10,721 10,026  
Amortization of intangible assets 172 176  
Other operating expenses 8,297 7,614  
Income before income taxes 2,275 2,267  
Assets 30,719 32,091  
Goodwill 8,019 7,836  
Wealth Management [Member]
      
Information about reportable segments      
Net interest income 22 20  
Provision for loan losses 0 0  
Noninterest income 4,663 3,893  
Amortization of intangible assets 57 66  
Other operating expenses 3,246 2,979  
Income before income taxes 1,382 868  
Assets 14,383 13,044  
Goodwill $ 2,660 $ 2,660