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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Changes in mortgage servicing rights        
Balance at beginning of period     $ 2,762  
Changes in fair value:        
Balance at end of period $ 2,727   2,727  
Mortgage Service Rights        
Changes in mortgage servicing rights        
Balance at beginning of period 2,662 $ 3,040 2,762 $ 3,036
Originated mortgage servicing rights 107 72 227 122
Changes in fair value:        
Due to change in model inputs and assumptions [1] 128 (36) 87 70
Other changes in fair value [2] (170) (165) (349) (317)
Balance at end of period $ 2,727 $ 2,911 $ 2,727 $ 2,911
[1] The change in fair value resulting from changes in valuation inputs or assumptions used in the valuation model reflects the change in discount rates and prepayment speed assumptions primarily due to changes in interest rates.
[2] Other changes in fair value reflect changes due to customer payments and passage of time.