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Business Combination (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Aug. 31, 2015
Business Acquisition [Line Items]    
Shares of CSBQ common stock outstanding   $ 6,643,341
Market price of CSBQ common stock   $ 3.85
Estimated fair value of CSBQ common stock $ 25,577,000  
Estimated fair value of CSBQ stock options 2,858,000  
Total consideration 28,435,000  
Fair value of assets acquired and liabilities assumed:    
Cash and cash equivalents 33,502,000  
Investment securities available for sale 74,254,000  
Loans 314,827,000  
Premises and equipment 9,019,000  
Bank owned life insurance 1,278,000  
Core deposit intangible 2,750,000  
Other real estate owned 5,672,000  
Prepaid and other assets 4,301,000  
Deposits (349,462,000)  
Securities sold under agreements to repurchase (17,622,000)  
FHLB advances and other borrowings (42,307,000)  
Payables and other liabilities (11,943,000)  
Total fair value of net assets acquired 24,269,000  
Goodwill $ 4,166,000 $ 4,166,069