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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in other intangible assets      
Balance, beginning of period $ 37,499 $ 41,986  
Additions 2,702 5,692  
Amortization (7,418) (9,262)  
Impairment charges   (917)  
Balance, end of period 32,783 37,499 41,986
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 99,083 98,081  
Accumulated Amortization (66,300) (60,582)  
Net Carrying Value 32,783 37,499 41,986
Estimated Amortization Expense      
2014 5,126    
2015 4,343    
2016 3,773    
2017 3,343    
2018 2,304    
Thereafter 13,894    
Net Carrying Value 32,783 37,499 41,986
Other disclosures      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 9,986 17,095 8,050
Fair market value and key assumptions used in determining the fair market value      
Fair market value, beginning of period 2,700,000    
Fair market value, end of period 2,400,000 2,700,000  
Core Deposit Premium
      
Changes in other intangible assets      
Balance, beginning of period 15,378 18,053  
Amortization (2,674) (2,675)  
Balance, end of period 12,704 15,378  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 44,642 44,642  
Accumulated Amortization (31,938) (29,264)  
Net Carrying Value 12,704 15,378  
Estimated Amortization Expense      
2014 2,674    
2015 2,674    
2016 2,674    
2017 2,674    
2018 2,008    
Net Carrying Value 12,704 15,378  
Mortgage Servicing Rights
      
Changes in other intangible assets      
Balance, beginning of period 22,121 22,933  
Additions 2,702 5,692  
Amortization (4,744) (6,504)  
Balance, end of period 20,079 22,121 22,933
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 54,441 51,739  
Accumulated Amortization (34,362) (29,618)  
Net Carrying Value 20,079 22,121 22,933
Estimated Amortization Expense      
2014 2,452    
2015 1,669    
2016 1,099    
2017 669    
2018 296    
Thereafter 13,894    
Net Carrying Value 20,079 22,121 22,933
Other disclosures      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 2,700 5,700 4,400
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 21,399 22,356 23,149
Weighted average discount rate (as a percent) 8.00% 8.00%  
Weighted average prepayment speed assumption (as a percent) 13.60% 14.00%  
Customer Relationships
      
Changes in other intangible assets      
Balance, beginning of period   910  
Amortization   (58)  
Impairment charges   (852)  
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
      
Changes in other intangible assets      
Balance, beginning of period   90  
Amortization   (25)  
Impairment charges   (65)  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value   300  
Accumulated Amortization   $ (300)