Shareholders' Equity (Regulatory Captial Requirements) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Parent Company [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	$ 455,699	$ 416,038
Total Capital to Risk-Weighted Assets	12.56%	12.45%
Total Capital for Capital Adequacy Purposes	$ 290,146	$ 267,365
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	$ 428,338	$ 389,289
Tier 1 Capital to Risk Weighted-Assets	11.81%	11.65%
Tier 1 Capital Required For Capital Adequacy Purposes	$ 217,609	$ 200,524
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets	6.00%	6.00%
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier 1 Capital	$ 406,340	$ 367,291
Common Equity Tier 1 Capital to Risk Weighted Assets	11.20%	10.99%
Common Equity Tier 1 Required for Capital Adequacy	$ 163,207	$ 150,383
Common Equity Tier 1 Capital for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	$ 428,338	$ 389,289
Tier 1 Leverage Capital to Average Assets	8.89%	8.79%
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	$ 192,690	$ 177,089
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	4.00%	4.00%
Bank [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	$ 453,033	$ 413,593
Total Capital to Risk-Weighted Assets	12.49%	12.38%
Total Capital for Capital Adequacy Purposes	$ 290,128	$ 267,338
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%	8.00%
Total Capital To Be Well Capitalized	$ 362,660	$ 334,172
Total Capital To Be Well Capitalized to Risk Weighted-Assets	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	$ 425,672	$ 386,844
Tier 1 Capital to Risk Weighted-Assets	11.74%	11.58%
Tier 1 Capital Required For Capital Adequacy Purposes	$ 217,596	$ 200,503
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets	6.00%	6.00%
Tier 1 Capital Required To Be Well Capitalized	$ 290,128	$ 267,338
Tier 1 Capital Required To Be Well Capitalized to Risk Weighted-Assets	8.00%	8.00%
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier 1 Capital	$ 425,672	$ 386,844
Common Equity Tier 1 Capital to Risk Weighted Assets	11.74%	11.58%
Common Equity Tier 1 Required for Capital Adequacy	$ 163,197	$ 150,378
Common Equity Tier 1 Capital for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital Required to be Well Capitalized	$ 235,729	$ 217,212
Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	$ 425,672	$ 386,844
Tier 1 Leverage Capital to Average Assets	8.84%	8.74%
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	$ 192,652	$ 177,048
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	4.00%	4.00%
Tier 1 Leverage Capital Required To Be Well Capitalized	$ 240,815	$ 221,310
Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets	5.00%	5.00%