Shareholders' Equity (Regulatory Captial Requirements) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Corporation [Member]
Total Capital (to Risk-Weighted Assets):
Total Capital	$ 324,198		$ 319,486
Total Capital to Risk-Weighted Assets	13.56%		13.29%
Total Capital for Capital Adequacy Purposes	191,264		192,306
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%		8.00%
Total Capital To Be Well Capitalized	239,080		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	296,827		291,292
Tier 1 Capital to Risk Weighted-Assets	12.42%		12.12%
Tier 1 Capital Required For Capital Adequacy Purposes	95,632		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	143,448		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	296,827	[1]	291,292	[1]
Tier 1 Leverage Capital to Average Assets	9.56%	[1]	9.41%	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	124,218	[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	155,273	[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	318,860		314,458
Total Capital to Risk-Weighted Assets	13.35%		13.09%
Total Capital for Capital Adequacy Purposes	191,000		192,147
Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets	8.00%		8.00%
Total Capital To Be Well Capitalized	238,875		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	291,489		286,264
Tier 1 Capital to Risk Weighted-Assets	12.20%		11.92%
Tier 1 Capital Required For Capital Adequacy Purposes	95,550		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	143,325		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	291,489	[1]	286,264	[1]
Tier 1 Leverage Capital to Average Assets	9.40%	[1]	9.26%	[1]
Tier 1 Leverage Capital Required for Capital Adequacy Purposes	124,048	[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	$ 155,061	[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