Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Investment [Line Items]
Fair value of investments reported at less than historical cost	$ 132,936,000		$ 206,914,000
Percentage of Bank portfolio	35.60%		55.80%
Proceeds from sales of securities, available for sale	$ 10,785,000	$ 36,811,000
Gross realized gain on sale of securities	445,000	154,000
Gross realized losses on sale of securities	1,000	0
Other than temporary impairment losses investments available for sale securities	0	$ 0
Pooled Trust Preferred Security [Member]
Investment [Line Items]
Current par balance	3,000,000
Original Par	$ 3,000,000