Goodwill and Intangibles - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible assets
Balance, beginning of period	$ 523	$ 523	$ 523
Goodwill acquired during the period	3,379
Balance, end of the period	3,902	523	523
Multifamily
Intangible assets
Balance, beginning of period
Goodwill acquired during the period	3,379
Impairment losses
Balance, end of the period	3,379
Banking
Intangible assets
Balance, beginning of period	523	523	523
Goodwill acquired during the period
Impairment losses
Balance, end of the period	$ 523	$ 523	$ 523