Shareholders' Equity (Regulatory Captial Requirements) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Corporation [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	$ 336,638		$ 319,486
Total Capital to Risk-Weighted Assets	13.26%		13.29%
Total Capital for Capital Adequacy Purposes	203,026		192,306
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%		8.00%
Total Capital To Be Well Capitalized	253,783		240,382
Total Capital To Be Well Capitalized to Risk Weighted-Assets	10.00%		10.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	308,534		291,292
Tier 1 Capital to Risk Weighted-Assets	12.15%		12.12%
Tier 1 Capital Required For Capital Adequacy Purposes	101,513		96,153
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets	4.00%		4.00%
Tier 1 Capital Required To Be Well Capitalized	152,270		144,229
Tier 1 Capital Required To Be Well Capitalized to Risk Weighted-Assets	6.00%		6.00%
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	308,534	[1]	291,292	[1]
Tier 1 Leverage Capital to Average Assets	9.35%	[1]	9.41%	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	132,015	[1]	123,785	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	4.00%	[1]	4.00%	[1]
Tier 1 Leverage Capital Required To Be Well Capitalized	165,019	[1]	154,732	[1]
Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets	5.00%	[1]	5.00%	[1]
Bank [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	332,090		314,458
Total Capital to Risk-Weighted Assets	13.09%		13.09%
Total Capital for Capital Adequacy Purposes	202,947		192,147
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%		8.00%
Total Capital To Be Well Capitalized	253,684		240,184
Total Capital To Be Well Capitalized to Risk Weighted-Assets	10.00%		10.00%
Tier 1 Capital (to Risk-Weighted Assets):
Tier 1 Capital	303,986		286,264
Tier 1 Capital to Risk Weighted-Assets	11.98%		11.92%
Tier 1 Capital Required For Capital Adequacy Purposes	101,473		96,074
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets	4.00%		4.00%
Tier 1 Capital Required To Be Well Capitalized	152,210		144,111
Tier 1 Capital Required To Be Well Capitalized to Risk Weighted-Assets	6.00%		6.00%
Tier 1 Capital (to Average Assets):
Tier 1 Leverage Capital	303,986	[1]	286,264	[1]
Tier 1 Leverage Capital to Average Assets	9.22%	[1]	9.26%	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	131,883	[1]	123,633	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets	4.00%	[1]	4.00%	[1]
Tier 1 Leverage Capital Required To Be Well Capitalized	$ 164,854	[1]	$ 154,541	[1]
Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets	5.00%	[1]	5.00%	[1]

[1] Leverage ratio