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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mortgage Servicing Rights          
Mortgage loans serviced for others $ 272,700,000 $ 284,900,000 $ 272,700,000 $ 284,900,000 $ 279,900,000
Mortgage loan servicing fees reported as non-interest income $ 197,000 $ 210,000 $ 376,000 $ 413,000