Employee Benefit Plans (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2022 USD ($) plan $ / shares shares	Jun. 30, 2021 USD ($) shares
Defined Benefit Plan Disclosure [Line Items]
Number of stock option plans | plan			1
Deferred tax benefit from stock options exercised	$ 8	$ 8	$ 84	$ 9
Options, exercises in period, intrinsic value	$ 50	$ 27	$ 555	$ 220
Exercise of options | shares	3,850	3,075	31,400	19,040
Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to the Plan	$ 453	$ 350	$ 847	$ 638
Stock Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Options, outstanding, intrinsic value	619,000		619,000
Proceeds from options exercised			263
Stock Appreciation Rights (SARs) [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense		64		113
Share-based compensation income	17		$ 43
Exercise of options | shares			6,500
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense	398	$ 162	$ 710	$ 363
Unrecognized compensation cost	$ 1,500		$ 1,500
Unrecognized compensation costs, period for recognition			1 year 11 months 15 days
Grant-date fair value			$ 148
Vested (in shares) | shares			6,646
Nonvested, beginning of period (in shares) | shares			144,367
Nonvested, beginning balance (in dollars per share) | $ / shares			$ 19.49
2015 Stock Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Rights available for grant (in shares) | shares	1,766,245		1,766,245
Cornerstone Non-Qualified Plan Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Rights issued (in shares) | shares			31,290
Capstone Stock Option Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Rights issued (in shares) | shares			2,266
401 (k) Matching Range One [Member] | Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match			100.00%
Employer matching contribution, percent of employees gross pay			3.00%
401 (k) Matching Range Two [Member] | Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match			50.00%
Employer matching contribution, percent of employees gross pay			2.00%