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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans     $ 1,586 $ 1,931      
Changes in other intangible assets              
Balance, beginning of period     15,596 17,849      
Additions     742 807      
Amortization     (1,072) (2,231)      
Balance, end of period $ 15,266 $ 16,425 15,266 16,425      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         $ 111,397 $ 110,655  
Accumulated Amortization         (96,131) (95,059)  
Other intangible assets 15,266 16,425 15,266 17,849 15,266 15,596 $ 16,425
Estimated Amortization Expense              
Other intangible assets 15,266 16,425 15,266 17,849 15,266 15,596 16,425
Core Deposit Premium              
Changes in other intangible assets              
Balance, beginning of period     0 2,006      
Additions     0 0      
Amortization     0 (1,337)      
Balance, end of period 0 669 0 669      
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 0 669 0 2,006 0 0 669
Estimated Amortization Expense              
Other intangible assets 0 669 0 2,006 0 0 669
Mortgage Servicing Rights              
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 500 400 700 800      
Changes in other intangible assets              
Balance, beginning of period     15,596 15,843      
Additions     742 807      
Amortization (600) (400) (1,072) (894)      
Balance, end of period 15,266 15,756 15,266 15,756      
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 15,554 18,560 15,554 18,560      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         66,755 66,013  
Accumulated Amortization         (51,489) (50,417)  
Other intangible assets 15,266 15,756 15,596 15,843 15,266 15,596 15,756
Estimated Amortization Expense              
2019 (remainder)         1,481    
2019         2,437    
2020         1,941    
2021         1,570    
2022         1,297    
2023         1,120    
Thereafter         5,420    
Other intangible assets $ 15,266 $ 15,756 $ 15,596 $ 15,843 $ 15,266 $ 15,596 $ 15,756
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)         0.174   0.139