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Intangible Assets (Detail Textuals) - Mortgage servicing rights (MSRs) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Mortgage loans serviced for others $ 282,900,000 $ 288,700,000 $ 282,900,000 $ 288,700,000 $ 285,800,000
Mortgage loan servicing fees reported as non-interest income $ 201,000 $ 209,000 $ 614,000 $ 629,000