Securities (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Accrued interest receivable	$ 2,100	$ 2,400
Fair value of available for sale and held to maturity securities pledged as collateral	280,700	$ 291,900
Amortized cost of callable debt securities	209,400
Fair value of callable debt securities	$ 203,800
Number of securities in a continuous unrealized loss position total | security	60	30
Number of debt securities below investment grade | security	2
Unrealized losses of securities in a continuous unrealized loss position total	$ (16,383)	$ (2,569)
Loans pledged as collateral	$ 2,100,000	$ 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	202
Unrealized losses of securities in a continuous unrealized loss position total	$ (437)	$ (672)
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	$ (908)	$ (1,225)
Minimum [Member]
Schedule of Available for Sale and Held to Maturty Securities [Line Items]
Maturity period of callable debt securities	3 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	1 year