Loans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) business loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans modified as debt restructurings | loan	0	3	0
Troubled debt restructuring, additional lending amount	$ 0	$ 0
Number of loans that subsequently default after modification | loan	0	0	0
Mortgage loans in process of foreclosure	$ 58,000	$ 14,000
Threshold amount to individually evaluate loans for impairment	250,000
Loans Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in allowance for loans that subsequently default after modification	33,000	11,000	$ 107,000
Loans Purchased
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, reversal	$ 36,000	$ 110,000	$ 2,000
Bank and Branch Acquisitions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of acquisitions | business	2