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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
GOODWILL AND OTHER INTANGIBLE ASSETS      
Goodwill non-cash impairment charge     $ 102,689
Changes in other intangible assets      
Balance as of the beginning of the period 41,986 45,390  
Additions 5,692 4,380  
Amortization (9,262) (7,033) (7,061)
Impairment charges (917)    
Balance as of the end of the period 37,499 41,986 45,390
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 98,081 92,389  
Accumulated Amortization (60,582) (50,403)  
Net Carrying Value 37,499 41,986 45,390
Estimated Amortization Expense      
2013 8,964    
2014 8,206    
2015 7,614    
2016 7,100    
2017 3,607    
Thereafter 2,008    
Net Carrying Value 37,499 41,986 45,390
Other disclosures      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 17,095 8,050 8,468
Core Deposit Premium
      
Changes in other intangible assets      
Balance as of the beginning of the period 18,053 20,727  
Amortization (2,675) (2,674)  
Balance as of the end of the period 15,378 18,053  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 44,642 44,642  
Accumulated Amortization (29,264) (26,589)  
Net Carrying Value 15,378 18,053  
Estimated Amortization Expense      
2013 2,674    
2014 2,674    
2015 2,674    
2016 2,674    
2017 2,674    
Thereafter 2,008    
Net Carrying Value 15,378 18,053  
Mortgage Servicing Rights
      
Changes in other intangible assets      
Balance as of the beginning of the period 22,933 22,712  
Additions 5,692 4,380  
Amortization (6,504) (4,159)  
Balance as of the end of the period 22,121 22,933  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 51,739 46,047  
Accumulated Amortization (29,618) (23,114)  
Net Carrying Value 22,121 22,933  
Estimated Amortization Expense      
2013 6,290    
2014 5,532    
2015 4,940    
2016 4,426    
2017 933    
Net Carrying Value 22,121 22,933  
Fair market value and key assumptions used in determining the fair market value      
Fair market value, beginning of period 23,149 23,709  
Fair market value, end of period 22,356 23,149  
Weighted average discount rate (as a percent) 8.00% 8.50%  
Weighted average prepayment speed assumption (as a percent) 14.00% 14.70%  
Customer Relationships
      
Changes in other intangible assets      
Balance as of the beginning of the period 910 1,050  
Amortization (58) (140)  
Impairment charges (852)    
Balance as of the end of the period   910  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 1,400 1,400  
Accumulated Amortization (1,400) (490)  
Net Carrying Value   910  
Estimated Amortization Expense      
Net Carrying Value   910  
Non-compete Agreements
      
Changes in other intangible assets      
Balance as of the beginning of the period 90 150  
Amortization (25) (60)  
Impairment charges (65)    
Balance as of the end of the period   90  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 300 300  
Accumulated Amortization (300) (210)  
Net Carrying Value   90  
Estimated Amortization Expense      
Net Carrying Value   $ 90