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Deposits (Detail Textuals) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deposits    
Time deposits with balances exceeded FDIC insurance limit of $250,000 $ 63,200,000 $ 72,300,000
Brokered deposits 48,500,000 36,400,000
Cash reserve deposit required as per Federal Reserve Bank 1,800,000 1,600,000
Average compensating balances $ 1,500,000 $ 570,000