Loans Receivable - Related Party Loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance outstanding at beginning of year	$ 8,460,000	$ 19,917,000	$ 20,775,000
Elimination of outstanding loan balance due to change in related party status	0	(10,930,000)	0
Principal additions	211,000	0	738,000
Principal reductions	(304,000)	(527,000)	(1,596,000)
Balance outstanding at end of year	8,367,000	8,460,000	$ 19,917,000
Unfunded commitments to related parties	592,000	750,000
Borrowings from related parties	$ 0	$ 0