Investment Securities (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Investment Securities [Line Items]
Number of holdings greater than 10 percent of stockholders equity | item		0	0
Income tax expense (benefit) related to net realized gains (losses)	$ 187,000
Restricted investment securities		$ 390,700,000	$ 425,000,000.0
Allowance for credit losses		0	0
Fair Value		468,842,000	417,058,000
Unrealized Loss		41,136,000	8,898,000
State And Municipals [Member]
Investment Securities [Line Items]
Fair Value		98,244,000	18,429,000
Unrealized Loss		6,608,000	176,000
Pass-Through Mortgage Securities [Member]
Investment Securities [Line Items]
Fair Value		167,176,000	181,216,000
Unrealized Loss		16,878,000	4,591,000
Collateralized Mortgage Obligations [Member]
Investment Securities [Line Items]
Fair Value		92,255,000	99,305,000
Unrealized Loss		9,817,000	3,239,000
Corporate Bonds [Member]
Investment Securities [Line Items]
Fair Value		111,167,000	118,108,000
Unrealized Loss		$ 7,833,000	$ 892,000
Number of institutions | item		6