Shareholders' Equity (Regulatory Captial Requirements) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Parent Company [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	$ 390,867	$ 367,443
Total Capital to Risk-Weighted Assets	12.26%	12.58%
Total Capital for Capital Adequacy Purposes	$ 255,093	$ 233,739
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	$ 364,655	$ 340,130
Tier 1 Capital to Risk Weighted-Assets	11.44%	11.64%
Tier 1 Capital Required For Capital Adequacy Purposes	$ 191,320	$ 175,304
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	$ 342,656	$ 318,131
Common Equity Tier 1 Capital to Risk Weighted Assets	10.75%	10.89%
Common Equity Tier 1 Required for Capital Adequacy	$ 143,490	$ 131,478
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	$ 364,655	$ 340,130
Tier 1 Leverage Capital to Average Assets	8.67%	9.37%
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	$ 168,271	$ 145,191
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	$ 389,840	$ 366,676
Total Capital to Risk-Weighted Assets	12.23%	12.55%
Total Capital for Capital Adequacy Purposes	$ 255,050	$ 233,676
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%	8.00%
Total Capital To Be Well Capitalized	$ 318,813	$ 292,095
Total Capital To Be Well Capitalized to Risk Weighted-Assets	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	$ 363,628	$ 339,363
Tier 1 Capital to Risk Weighted-Assets	11.41%	11.62%
Tier 1 Capital Required For Capital Adequacy Purposes	$ 191,288	$ 175,257
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets	6.00%	6.00%
Tier 1 Capital Required To Be Well Capitalized	$ 255,050	$ 233,676
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	$ 363,628	$ 339,363
Common Equity Tier 1 Capital to Risk Weighted Assets	11.41%	11.62%
Common Equity Tier 1 Required for Capital Adequacy	$ 143,466	$ 131,443
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	$ 207,228	$ 189,861
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	$ 363,628	$ 339,363
Tier 1 Leverage Capital to Average Assets	8.65%	9.36%
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	$ 168,207	$ 145,103
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	$ 210,259	$ 181,378
Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets	5.00%	5.00%