Securities (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Accrued interest receivable	$ 2,500	$ 2,900
Fair value of available for sale and held to maturity securities pledged as collateral	312,200	$ 431,900
Amortized cost of callable debt securities	169,000
Fair value of callable debt securities	$ 167,400
Number of securities in a continuous unrealized loss position total | security	28	41
Number of debt securities below investment grade | security	2
Unrealized losses of securities in a continuous unrealized loss position total	$ (3,286)	$ (4,900)
Loans pledged as collateral	$ 2,200,000	$ 2,100,000
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	$ 4,000
Unrealized losses of trust preferred securities of individual name issuers that are below investment grade	358
Unrealized losses of securities in a continuous unrealized loss position total	$ (973)	$ (745)
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	3	3
Unrealized losses of securities in a continuous unrealized loss position total	$ (1,274)	$ (958)
Minimum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Maturity period of callable debt securities	4 years
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	16 years
Call features of callable debt securities	2 years