Shareholders' Equity (Regulatory Captial Requirements) (Details) $ in Thousands		Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Corporation [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital		$ 601,662	$ 605,005
Total Capital to Risk-Weighted Assets		0.1201	0.1237
Total Capital for Capital Adequacy Purposes		$ 400,831	$ 391,363
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets		0.0800	0.0800
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital		$ 565,329	$ 571,794
Tier 1 Capital to Risk Weighted-Assets		0.1128	0.1169
Tier 1 Capital Required For Capital Adequacy Purposes		$ 300,623	$ 293,522
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets		0.0600	0.0600
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier 1 Capital		$ 543,333	$ 549,798
Common Equity Tier 1 Capital to Risk-Weighted Assets		0.1084	0.1124
Common Equity Tier 1 Capital Required for Capital Adequacy		$ 225,467	$ 220,142
Common Equity Tier 1 Capital for Capital Adequacy Purposes to Risk-Weighted Assets		0.0450	0.0450
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	[1]	$ 565,329	$ 571,794
Tier 1 Leverage Capital to Average Assets	[1]	0.0825	0.0865
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	[1]	$ 273,951	$ 264,295
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	[1]	0.0400	0.0400
Bank [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital		$ 584,596	$ 588,090
Total Capital to Risk-Weighted Assets		0.1167	0.1202
Total Capital for Capital Adequacy Purposes		$ 400,723	$ 391,260
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets		0.0800	0.0800
Total Capital To Be Well Capitalized		$ 500,904	$ 489,074
Total Capital To Be Well Capitalized to Risk Weighted-Assets		0.1000	0.1000
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital		$ 548,263	$ 554,879
Tier 1 Capital to Risk Weighted-Assets		0.1095	0.1135
Tier 1 Capital Required For Capital Adequacy Purposes		$ 300,542	$ 293,445
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets		0.0600	0.0600
Tier 1 Capital Required To Be Well Capitalized		$ 400,723	$ 391,260
Tier 1 Capital Required To Be Well Capitalized to Risk Weighted-Assets		0.0800	0.0800
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier 1 Capital		$ 548,263	$ 554,879
Common Equity Tier 1 Capital to Risk-Weighted Assets		0.1095	0.1135
Common Equity Tier 1 Capital Required for Capital Adequacy		$ 225,407	$ 220,083
Common Equity Tier 1 Capital for Capital Adequacy Purposes to Risk-Weighted Assets		0.0450	0.0450
Common Equity Tier 1 Capital To Be Well Capitalized		$ 325,587	$ 317,898
Common Equity Tier 1 Capital To Be Well Capitalized to Risk-Weighted Assets		0.0650	0.0650
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	[1]	$ 548,263	$ 554,879
Tier 1 Leverage Capital to Average Assets	[1]	0.0801	0.0840
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	[1]	$ 273,868	$ 264,177
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	[1]	0.0400	0.0400
Tier 1 Leverage Capital Required To Be Well Capitalized	[1]	$ 342,336	$ 330,222
Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets	[1]	0.0500	0.0500

[1] Leverage ratio.