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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Changes in other intangible assets          
Balance, beginning of period     $ 41,986    
Additions     2,506    
Amortization (3,031) (1,629) (4,792) (3,176)  
Impairment charges recorded     (917)    
Balance, end of period 39,700   39,700    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 3,394 1,005 6,371 3,203  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 94,895   94,895   92,389
Accumulated Amortization (55,195)   (55,195)   (50,403)
Net 39,700   39,700    
Estimated Amortization Expense          
2012 (remainder) 3,292   3,292    
2013 5,736   5,736    
2014 5,364   5,364    
2015 5,006   5,006    
2016 4,676   4,676    
2017 4,413   4,413    
Thereafter 11,213   11,213    
Net 39,700   39,700    
Core Deposit Premium
         
Changes in other intangible assets          
Balance, beginning of period     18,053    
Amortization     (1,338)    
Balance, end of period 16,715   16,715    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (27,927)   (27,927)   (26,589)
Net 16,715   16,715    
Estimated Amortization Expense          
2012 (remainder) 1,337   1,337    
2013 2,674   2,674    
2014 2,674   2,674    
2015 2,674   2,674    
2016 2,674   2,674    
2017 2,674   2,674    
Thereafter 2,008   2,008    
Net 16,715   16,715    
Mortgage Servicing Rights
         
Changes in other intangible assets          
Balance, beginning of period     22,933    
Additions     2,506    
Amortization (1,400) (900) (2,454) (1,700)  
Balance, end of period 22,985   22,985    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,300 700 2,500 2,100  
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 23,359 23,190 23,359 23,190  
Weighted average discount rate (as a percent)     8.00% 8.50%  
Weighted average prepayment speed assumption (as a percent)     14.20% 14.50%  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 48,553   48,553   46,047
Accumulated Amortization (25,568)   (25,568)   (23,114)
Net 22,985   22,985    
Estimated Amortization Expense          
2012 (remainder) 1,955   1,955    
2013 3,062   3,062    
2014 2,690   2,690    
2015 2,332   2,332    
2016 2,002   2,002    
2017 1,739   1,739    
Thereafter 9,205   9,205    
Net 22,985   22,985    
Customer Relationships
         
Changes in other intangible assets          
Balance, beginning of period     910    
Amortization     (58)    
Impairment charges recorded     (852)    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 1,400   1,400   1,400
Accumulated Amortization (1,400)   (1,400)   (490)
Non-Compete Agreements
         
Changes in other intangible assets          
Balance, beginning of period     90    
Amortization     (25)    
Impairment charges recorded     (65)    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 300   300   300
Accumulated Amortization $ (300)   $ (300)   $ (210)