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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Changes in other intangible assets          
Balance, beginning of period     $ 29,697    
Additions     1,245    
Amortization     (3,664)    
Balance, end of period $ 27,278   27,278    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 100,836       $ 101,329
Accumulated Amortization (73,558)       (71,632)
Net Carrying Value 27,278   29,697   29,697
Estimated Amortization Expense          
2015 (remainder) 2,819        
2016 4,996        
2017 4,320        
2018 3,164        
2019 778        
2020 434        
Thereafter 10,767        
Net Carrying Value 27,278   29,697   29,697
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,630 $ 1,227 3,224 $ 2,466  
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period     10,029    
Amortization     (1,337)    
Balance, end of period 8,692   8,692    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 44,642       44,642
Accumulated Amortization (35,950)       (34,613)
Net Carrying Value 8,692   10,029   10,029
Estimated Amortization Expense          
2015 (remainder) 1,337        
2016 2,674        
2017 2,674        
2018 2,007        
Net Carrying Value 8,692   10,029   10,029
Mortgage Servicing Rights          
Changes in other intangible assets          
Balance, beginning of period     19,668    
Additions     1,245    
Amortization (900) (600) (2,327) (1,200)  
Balance, end of period 18,586   18,586    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 56,194       56,687
Accumulated Amortization (37,608)       (37,019)
Net Carrying Value 18,586   19,668   19,668
Estimated Amortization Expense          
2015 (remainder) 1,482        
2016 2,322        
2017 1,646        
2018 1,157        
2019 778        
2020 434        
Thereafter 10,767        
Net Carrying Value 18,586   19,668   $ 19,668
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 600 500 1,200 900  
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period     19,975 21,399  
Fair market value, end of period $ 19,202 $ 20,341 $ 19,202 $ 20,341  
Weighted average discount rate (as a percent)     9.50% 8.00%  
Weighted average prepayment speed assumption (as a percent)     13.80% 15.10%