Securities (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) security	Mar. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($) security	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Held to maturity debt securities, at amortized cost	$ 0			$ 10,415
Held to maturity debt securities, fair value	0			10,316
Unrealized losses on held to maturity securities, net of tax	(11,866)	$ (17,503)		(28,309)	$ (35,062)	$ (32,675)	$ (23,510)
Fair value of available for sale and held to maturity securities pledged as collateral	451,500			$ 439,700
Amortized cost of callable debt securities	262,500
Fair value of callable debt securities	$ 260,600
Number of securities in a continuous unrealized loss position total | security	49			90
Unrealized losses of securities in a continuous unrealized loss position total	$ (7,368)			$ (24,396)
Individual name issuer trust preferred debt securities
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Number of securities in a continuous unrealized loss position total | security	5			5
Securities in unrealized loss position, number of companies issuing securities | 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	518
Unrealized losses of securities in a continuous unrealized loss position total	$ (1,014)			$ (1,535)
Corporate bonds [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Number of securities in a continuous unrealized loss position total | security	4			8
Unrealized losses of securities in a continuous unrealized loss position total	$ (1,568)			$ (1,777)
Minimum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Maturity period of callable debt securities	3 months
Call features of callable debt securities	1 month
Maximum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Maturity period of callable debt securities	18 years
Call features of callable debt securities	4 years
Adjustments for Change in Accounting Principle [Domain]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Held to maturity debt securities, at amortized cost			$ 10,400
Held to maturity debt securities, fair value			10,300
Unrealized losses on held to maturity securities, net of tax			$ (75)