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Fair Value - Carrying Value of Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 6,671 $ 5,925 $ 5,894 $ 6,120
New MSRs 324 161 893 522
Total gains (losses) included in earnings:        
Changes in valuation inputs and assumptions [1] 65 (121) 627 (209)
Other changes in fair value [1],[2] (243) (199) (597) (667)
Ending balance 6,817 5,766 6,817 5,766
Contractually servicing fees earned [1] $ 375 $ 379 $ 1,122 $ 1,158
[1] Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2018 and 2017.
[2] Primarily represents changes in expected future cash flows due to payoffs and paydowns.