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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Changes in other intangible assets          
Balance, beginning of period     $ 41,986    
Additions     4,277    
Amortization (2,698) (1,709) (6,573) (4,885)  
Impairment charges     (917)    
Balance, end of period 38,773   38,773    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 4,713 1,177 11,084 4,380  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 96,666   96,666   92,389
Accumulated Amortization (57,893)   (57,893)   (50,403)
Net 38,773   38,773    
Estimated Amortization Expense          
2012 (remainder) 2,265   2,265    
2013 8,534   8,534    
2014 7,805   7,805    
2015 7,233   7,233    
2016 6,741   6,741    
2017 4,187   4,187    
Thereafter 2,008   2,008    
Net 38,773   38,773    
Core Deposit Premium
         
Changes in other intangible assets          
Balance, beginning of period     18,053    
Amortization     (2,006)    
Balance, end of period 16,047   16,047    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (28,595)   (28,595)   (26,589)
Net 16,047   16,047    
Estimated Amortization Expense          
2012 (remainder) 669   669    
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 16,047   16,047    
Mortgage Servicing Rights
         
Changes in other intangible assets          
Balance, beginning of period     22,933    
Additions     4,277    
Amortization (2,000) (1,000) (4,484) (2,700)  
Balance, end of period 22,726   22,726    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,800 500 4,300 2,600  
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 22,894 22,616 22,894 22,616  
Weighted average discount rate (as a percent)     8.00% 8.50%  
Weighted average prepayment speed assumption (as a percent)     14.40% 13.60%  
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 50,324   50,324   46,047
Accumulated Amortization (27,598)   (27,598)   (23,114)
Net 22,726   22,726    
Estimated Amortization Expense          
2012 (remainder) 1,596   1,596    
2013 5,860   5,860    
2014 5,131   5,131    
2015 4,559   4,559    
2016 4,067   4,067    
2017 1,513   1,513    
Net 22,726   22,726    
Customer Relationships
         
Changes in other intangible assets          
Balance, beginning of period     910    
Amortization     (58)    
Impairment charges     (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     (65)    
Gross carrying value and accumulated amortization related to intangible assets          
Gross Carrying Value 300   300   300
Accumulated Amortization $ (300)   $ (300)   $ (210)