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Intangible Assets (Detail Textuals) - Mortgage servicing rights (MSRs) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Mortgage loans serviced for others $ 285,800,000 $ 294,400,000  
Mortgage loan servicing fees reported as other non-interest income $ 833,000 $ 854,000 $ 873,000