Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Securities available for sale and held to maturity pledged as collateral, fair value	$ 439,700	$ 357,800
Amortized cost of callable debt securities	273,100
Fair value of callable debt securities	$ 265,800
Number of individual name issuer trust preferred securities in a continuous unrealized loss position total | security	90	71
Unrealized losses of securities in a continuous unrealized loss position total	$ 24,396	$ 13,535
Minimum [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Callable debt securities, maturity period	5 months
Callable debt securities, call feature period	1 month
Maximum [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Callable debt securities, maturity period	18 years
Callable debt securities, call feature period	3 years
Individual name issuer trust preferred debt securities [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Number of individual name issuer trust preferred securities in a continuous unrealized loss position total | security	5	7
Number of companies issuing securities in continuous unrealized loss position | security	4
Amortized cost of trust preferred securities of individual name issuers that are below investment grade	$ 6,100
Unrealized losses of trust preferred securities of individual name issuers that are below investment grade	744
Unrealized losses of securities in a continuous unrealized loss position total	$ 1,535	$ 1,122
Corporate bonds [Member]
Schedule of Available for Sale and Held to Maturity Securities [Line Items]
Number of individual name issuer trust preferred securities in a continuous unrealized loss position total | security	8	6
Unrealized losses of securities in a continuous unrealized loss position total	$ 1,777	$ 805