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Mergers and Acquisitions - United American Savings Bank, Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Apr. 30, 2016
Assets acquired:
Goodwill	$ 10,288	$ 10,288
United American Savings Bank
Assets acquired:
Cash and cash equivalents			$ 9,899
Securities available for sale			60
Loans receivable			66,145
Federal bank stocks			978
Accrued interest receivable			187
Premises and equipment			1,169
Goodwill		$ 6,600	6,624
Core deposit intangible			232
Prepaid expenses and other assets			989
Total assets acquired			86,283
Liabilities assumed:
Deposits			72,700
Accrued interest payable			29
Accrued expenses and other liabilities			346
Total liabilities assumed			73,075
Identifiable net assets acquired			$ 13,208