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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Changes in other intangible assets          
Balance, beginning of period     $ 37,499    
Additions     1,589    
Amortization     (4,357)    
Balance, end of period 34,731   34,731    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 2,888 3,394 7,016 6,371  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 97,970   97,970   98,081
Accumulated Amortization (63,239)   (63,239)   (60,582)
Net Carrying Value 34,731   34,731    
Estimated Amortization Expense          
2013 (remainder) 3,674   3,674    
2014 6,775   6,775    
2015 6,141   6,141    
2016 5,594   5,594    
2017 5,168   5,168    
2018 4,149   4,149    
Thereafter 3,230   3,230    
Net Carrying Value 34,731   34,731    
Core Deposit Premium
         
Changes in other intangible assets          
Balance, beginning of period     15,378    
Amortization     (1,337)    
Balance, end of period 14,041   14,041    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 44,642   44,642   44,642
Accumulated Amortization (30,601)   (30,601)   (29,264)
Net Carrying Value 14,041   14,041    
Estimated Amortization Expense          
2013 (remainder) 1,337   1,337    
2014 2,674   2,674    
2015 2,674   2,674    
2016 2,674   2,674    
2017 2,674   2,674    
2018 2,008   2,008    
Net Carrying Value 14,041   14,041    
Mortgage Servicing Rights
         
Changes in other intangible assets          
Balance, beginning of period     22,121    
Additions     1,589    
Amortization (1,400) (1,400) (3,020) (2,500)  
Balance, end of period 20,690   20,690    
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 700 1,300 1,600 2,500  
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 21,427 23,359 21,427 23,359  
Weighted average discount rate (as a percent)     8.00% 8.00%  
Weighted average prepayment speed assumption (as a percent)     14.50% 14.20%  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 53,328   53,328   51,739
Accumulated Amortization (32,638)   (32,638)   (29,618)
Net Carrying Value 20,690   20,690    
Estimated Amortization Expense          
2013 (remainder) 2,337   2,337    
2014 4,101   4,101    
2015 3,467   3,467    
2016 2,920   2,920    
2017 2,494   2,494    
2018 2,141   2,141    
Thereafter 3,230   3,230    
Net Carrying Value 20,690   20,690    
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)