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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Changes in other intangible assets          
Balance, beginning of period     $ 37,499    
Additions     2,116    
Amortization     (5,994)    
Balance, end of period 33,621   33,621    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,476 4,713 8,492 11,084  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 98,497   98,497   98,081
Accumulated Amortization (64,876)   (64,876)   (60,582)
Net Carrying Value 33,621   33,621    
Estimated Amortization Expense          
2013 (remainder) 1,425   1,425    
2014 5,248   5,248    
2015 4,495   4,495    
2016 3,942   3,942    
2017 3,511   3,511    
2018 2,512   2,512    
Thereafter 12,488   12,488    
Net Carrying Value 33,621   33,621    
Core Deposit Premium
         
Changes in other intangible assets          
Balance, beginning of period     15,378    
Amortization     (2,006)    
Balance, end of period 13,372   13,372    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (31,270)   (31,270)   (29,264)
Net Carrying Value 13,372   13,372    
Estimated Amortization Expense          
2013 (remainder) 669   669    
2014 2,674   2,674    
2015 2,674   2,674    
2016 2,674   2,674    
2017 2,674   2,674    
2018 2,007   2,007    
Net Carrying Value 13,372   13,372    
Mortgage Servicing Rights
         
Changes in other intangible assets          
Balance, beginning of period     22,121    
Additions     2,116    
Amortization (1,000) (2,000) (3,988) (4,500)  
Balance, end of period 20,249   20,249    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 500 1,800 2,100 4,300  
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period     22,356 23,149  
Fair market value, end of period 20,763 22,894 20,763 22,894  
Weighted average discount rate (as a percent)     8.00% 8.00%  
Weighted average prepayment speed assumption (as a percent)     14.20% 14.40%  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 53,855   53,855   51,739
Accumulated Amortization (33,606)   (33,606)   (29,618)
Net Carrying Value 20,249   20,249    
Estimated Amortization Expense          
2013 (remainder) 756   756    
2014 2,574   2,574    
2015 1,821   1,821    
2016 1,268   1,268    
2017 837   837    
2018 505   505    
Thereafter 12,488   12,488    
Net Carrying Value 20,249   20,249    
Customer Relationships
         
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value         1,400
Accumulated Amortization         (1,400)
Non-compete Agreements
         
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value         300
Accumulated Amortization         $ (300)