Loans and Leases and Allowance for Credit Losses - Bank loans granted to executive officers and directors (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of loans outstanding to executive officers and directors of the holding company
Change in related party status	$ (1,179)	$ 0
Loans Receivable | Executive Officers and Directors
Summary of loans outstanding to executive officers and directors of the holding company
Balance at beginning of period	2,262	2,432
New loans and advances	66	86
Repayments	(1,102)	(256)
Balance at end of period	$ 47	$ 2,262