Mergers and Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 30, 2016	Dec. 31, 2015
Assets acquired:
Goodwill	$ 10,288		$ 3,664
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
Consideration paid		$ 13,208