Loans Receivable - Change in Accretable Yield (Details) - PCI Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of the year	$ 11,224	$ 13,860	$ 17,592
Accretion	(2,674)	(3,471)	(4,962)
Disposal and other	(2,871)	(2,758)	(3,329)
Change in accretable yield	3,814	3,593	4,559
Balance at the end of the year	$ 9,493	$ 11,224	$ 13,860