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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Changes in other intangible assets      
Balance, beginning of period $ 32,783    
Additions 408    
Amortization (1,240)    
Balance, end of period 31,951    
Other disclosures      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,239 4,128  
Gross carrying value and accumulated amortization related to intangible assets      
Gross Carrying Value 99,491   99,083
Accumulated Amortization (67,540)   (66,300)
Net 31,951    
Estimated Amortization Expense      
2014 (remainder) 3,726    
2015 4,534    
2016 4,119    
2017 3,820    
2018 2,894    
2019 678    
Thereafter 12,180    
Net 31,951    
Core Deposit Premium
     
Changes in other intangible assets      
Balance, beginning of period 12,704    
Amortization (669)    
Balance, end of period 12,035    
Gross carrying value and accumulated amortization related to intangible assets      
Gross Carrying Value 44,642   44,642
Accumulated Amortization (32,607)   (31,938)
Net 12,035    
Estimated Amortization Expense      
2014 (remainder) 2,006    
2015 2,674    
2016 2,674    
2017 2,674    
2018 2,007    
Net 12,035    
Mortgage Servicing Rights
     
Changes in other intangible assets      
Balance, beginning of period 20,079    
Additions 408    
Amortization (571) (1,600)  
Balance, end of period 19,916    
Other disclosures      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 400 900  
Fair market value and key assumptions used in determining the fair market value      
Fair market value, beginning of period 21,399 22,356  
Fair market value, end of period 20,832 21,595  
Weighted average discount rate (as a percent) 8.00% 8.00%  
Weighted average prepayment speed assumption (as a percent) 14.10% 14.10%  
Gross carrying value and accumulated amortization related to intangible assets      
Gross Carrying Value 54,849   54,441
Accumulated Amortization (34,933)   (34,362)
Net 19,916    
Estimated Amortization Expense      
2014 (remainder) 1,720    
2015 1,860    
2016 1,445    
2017 1,146    
2018 887    
2019 678    
Thereafter 12,180    
Net $ 19,916