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Restrictions on Cash, Securities, Bank Dividends, Loans or Advances (Details)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Restrictions on Cash, Bank Dividends, Loans or Advances (Textual) [Abstract]    
Reserve requirements with federal reserve $ 129,429,000 $ 109,044,000
FHLB stock 15,070,000 9,589,000
FHLB required investment amount 7,181,000 $ 7,611,000
Amount transferable loans maximum $ 105,075,000  
Regulatory restrictions on payments of dividends, excess surplus ratio 10  
Company borrowings $ 0