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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
OTHER INTANGIBLE ASSETS        
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 1,312 $ 1,466    
Changes in other intangible assets        
Balance, beginning of period 20,459      
Additions 588      
Amortization (1,188)      
Balance, end of period 19,859      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets        
Gross Carrying Value     $ 107,279 $ 106,691
Accumulated Amortization     (87,420) (86,232)
Other intangible assets 20,459   19,859 20,459
Estimated Amortization Expense        
2017 (remainder)     3,504  
2018     3,679  
2019     1,397  
2020     1,191  
2021     992  
2022     893  
Thereafter     8,203  
Other intangible assets 20,459   19,859 20,459
Core Deposit Premium        
Changes in other intangible assets        
Balance, beginning of period 4,680      
Additions 0      
Amortization (668)      
Balance, end of period 4,012      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets        
Gross Carrying Value     44,642 44,642
Accumulated Amortization     (40,630) (39,962)
Other intangible assets 4,680   4,012 4,680
Estimated Amortization Expense        
2017 (remainder)     2,006  
2018     2,006  
2019     0  
2020     0  
2021     0  
2022     0  
Thereafter     0  
Other intangible assets 4,680   4,012 4,680
Mortgage Servicing Rights        
OTHER INTANGIBLE ASSETS        
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 600 500    
Changes in other intangible assets        
Balance, beginning of period 15,779      
Additions 588      
Amortization (520) (1,509)    
Balance, end of period 15,847      
Fair market value and key assumptions used in determining the fair market value        
Fair market value, beginning of period 18,087 18,345    
Fair market value, end of period $ 17,627 $ 17,195    
Weighted average discount rate 9.50% 9.50%    
Forecasted constant prepayment rate assumption 15.00% 15.30%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets        
Gross Carrying Value     62,637 62,049
Accumulated Amortization     (46,790) (46,270)
Other intangible assets $ 15,779   15,847 15,779
Estimated Amortization Expense        
2017 (remainder)     1,498  
2018     1,673  
2019     1,397  
2020     1,191  
2021     992  
2022     893  
Thereafter     8,203  
Other intangible assets $ 15,779   $ 15,847 $ 15,779