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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Changes in other intangible assets          
Balance, beginning of period     $ 32,783    
Additions     1,601    
Amortization     (3,886)    
Balance, end of period 30,498   30,498    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,685 1,476 4,151 8,492  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 100,684   100,684   99,083
Accumulated Amortization (70,186)   (70,186)   (66,300)
Net 30,498   30,498    
Estimated Amortization Expense          
2014 (remainder) 1,690   1,690    
2015 4,879   4,879    
2016 4,365   4,365    
2017 4,018   4,018    
2018 3,074   3,074    
2019 843   843    
Thereafter 11,629   11,629    
Net 30,498   30,498    
Core Deposit Premium
          
Changes in other intangible assets          
Balance, beginning of period     12,704    
Amortization     (2,006)    
Balance, end of period 10,698   10,698    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (33,944)   (33,944)   (31,938)
Net 10,698   10,698    
Estimated Amortization Expense          
2014 (remainder) 669   669    
2015 2,674   2,674    
2016 2,674   2,674    
2017 2,674   2,674    
2018 2,007   2,007    
Net 10,698   10,698    
Mortgage Servicing Rights
          
Changes in other intangible assets          
Balance, beginning of period     20,079    
Additions     1,601    
Amortization 700 1,000 (1,880) 4,000  
Balance, end of period 19,800   19,800    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 700 500 1,600 2,100  
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period     21,399 22,356  
Fair market value, end of period 20,471 20,763 20,471 20,763  
Weighted average discount rate (as a percent)     9.50% 8.00%  
Weighted average prepayment speed assumption (as a percent)     12.90% 14.20%  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 56,042   56,042   54,441
Accumulated Amortization (36,242)   (36,242)   (34,362)
Net 19,800   19,800    
Estimated Amortization Expense          
2014 (remainder) 1,021   1,021    
2015 2,205   2,205    
2016 1,691   1,691    
2017 1,344   1,344    
2018 1,067   1,067    
2019 843   843    
Thereafter 11,629   11,629    
Net $ 19,800   $ 19,800