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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Changes in other intangible assets          
Balance, beginning of period     $ 32,783    
Additions     920    
Amortization     (2,558)    
Balance, end of period 31,145   31,145    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,227 2,888 2,466 7,016  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 100,003   100,003   99,083
Accumulated Amortization (68,858)   (68,858)   (66,300)
Net 31,145   31,145    
Estimated Amortization Expense          
2014 (remainder) 3,313   3,313    
2015 5,360   5,360    
2016 4,738   4,738    
2017 4,269   4,269    
2018 3,242   3,242    
2019 932   932    
Thereafter 9,291   9,291    
Net 31,145   31,145    
Core Deposit Premium
          
Changes in other intangible assets          
Balance, beginning of period     12,704    
Amortization     (1,338)    
Balance, end of period 11,366   11,366    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (33,276)   (33,276)   (31,938)
Net 11,366   11,366    
Estimated Amortization Expense          
2014 (remainder) 1,337   1,337    
2015 2,674   2,674    
2016 2,674   2,674    
2017 2,674   2,674    
2018 2,007   2,007    
Net 11,366   11,366    
Mortgage Servicing Rights
          
Changes in other intangible assets          
Balance, beginning of period     20,079    
Additions     920    
Amortization (600) (1,400) (1,220) (3,000)  
Balance, end of period 19,779   19,779    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 500 700 900 1,600  
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 20,341 21,427 20,341 21,427  
Weighted average discount rate (as a percent)     8.00% 8.00%  
Weighted average prepayment speed assumption (as a percent)     15.10% 14.50%  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 55,361   55,361   54,441
Accumulated Amortization (35,582)   (35,582)   (34,362)
Net 19,779   19,779    
Estimated Amortization Expense          
2014 (remainder) 1,976   1,976    
2015 2,686   2,686    
2016 2,064   2,064    
2017 1,595   1,595    
2018 1,235   1,235    
2019 932   932    
Thereafter 9,291   9,291    
Net $ 19,779   $ 19,779