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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans     $ 2,836 $ 3,013      
Changes in other intangible assets              
Balance, beginning of period     15,596 17,849      
Additions     1,189 1,204      
Amortization     (1,727) (3,419)      
Balance, end of period $ 15,058 $ 15,634 15,058 15,634      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         $ 111,844 $ 110,655  
Accumulated Amortization         (96,786) (95,059)  
Other intangible assets 15,058 15,634 15,596 17,849 15,058 15,596 $ 15,634
Estimated Amortization Expense              
Other intangible assets 15,058 15,634 15,596 17,849 15,058 15,596 15,634
Core Deposit Premium              
Changes in other intangible assets              
Balance, beginning of period     0 2,006      
Additions     0 0      
Amortization     0 (2,006)      
Balance, end of period 0 0 0 0      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         44,642 44,642  
Accumulated Amortization         (44,642) (44,642)  
Other intangible assets 0 0 0 2,006 0 0 0
Estimated Amortization Expense              
Other intangible assets 0 0 0 2,006 0 0 0
Mortgage Servicing Rights              
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 400 400 1,200 1,200      
Changes in other intangible assets              
Balance, beginning of period     15,596 15,843      
Additions     1,189 1,204      
Amortization (700) (500) (1,727) (1,413)      
Balance, end of period 15,058 15,634 15,058 15,634      
Fair market value and key assumptions used in determining the fair market value              
Fair market value, beginning of period     17,696 17,161      
Fair market value, end of period 15,965 18,315 15,965 18,315      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         67,202 66,013  
Accumulated Amortization         (52,144) (50,417)  
Other intangible assets 15,058 15,634 15,596 15,843 15,058 15,596 15,634
Estimated Amortization Expense              
2019 (remainder)         669    
2019         2,373    
2020         1,918    
2021         1,585    
2022         1,319    
2023         1,118    
Thereafter         6,076    
Other intangible assets $ 15,058 $ 15,634 $ 15,596 $ 15,843 $ 15,058 $ 15,596 $ 15,634
Measurement Input, Discount Rate | Mortgage Servicing Rights              
Fair market value and key assumptions used in determining the fair market value              
Forecasted constant prepayment rate assumption (1)         0.095   0.095
Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights              
Fair market value and key assumptions used in determining the fair market value              
Forecasted constant prepayment rate assumption (1)         0.146   0.140