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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mortgage Servicing Rights      
Mortgage loans serviced for others $ 275,700,000 $ 283,100,000 $ 279,900,000
Mortgage loan servicing fees reported as non-interest income $ 178,000 $ 203,000