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Borrowings (Details Textual) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Repurchase Agreements $ 396,151,000 $ 362,573,000
Securities Pledged for Repurchase Agreements 511,294,000 $ 475,601,000
Lines of credit $ 230,000,000