Employee Benefits (Various Benefits - Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) fund	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Schedule Of Employee Benefits [Line Items]
Percentage of internal revenue contribution			25.00%
Percentage of internal revenue service limitations			6.00%
Number of investment funds | fund			11
Number of equity funds | fund			7
Number of fixed income funds | fund			4
Number of bond funds | fund			3
Number of real estate funds | fund			1
Accrued expenses and other liabilities	$ 16,994		$ 16,994		$ 11,156
Noninterest expense	6,765	$ 7,048	14,064	$ 13,966
Employer contribution in defined contribution plan			490	442
Postretirement Life Insurance [Member]
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	1,359		1,359		1,330
Postemployment benefit expense			29	26
Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Noninterest expense			43	48
Liability related to these postretirement benefits	2,134		2,134		2,123
Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,198		1,198		1,163
Noninterest expense			284	271
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Director [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	$ 2,079		2,079		$ 2,086
Noninterest expense			$ 85	$ 62
Maximum | Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period			20 years
Maximum | Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Terms of services			5 years
Minimum | Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period			15 years
Minimum | Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Terms of services			1 year