Employee Benefits (Schedule Of Fair Value Of Pension Plan Assets) (Details) (United States Pension Plan of US Entity, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 53,415		$ 49,236		$ 42,325
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53,415		49,236
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			251
Bank Collective Trust Funds - Equity Securities [Member] | Large-Cap Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,473	[1]	17,079	[1]
Bank Collective Trust Funds - Equity Securities [Member] | Small-Cap Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,351	[2]	3,091	[2]
Bank Collective Trust Funds - Equity Securities [Member] | International Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,474	[3]	7,482	[3]
Bank Collective Trust Funds - Equity Securities [Member] | Level 2 [Member] | Large-Cap Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,473	[1]	17,079	[1]
Bank Collective Trust Funds - Equity Securities [Member] | Level 2 [Member] | Small-Cap Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,351	[2]	3,091	[2]
Bank Collective Trust Funds - Equity Securities [Member] | Level 2 [Member] | International Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,474	[3]	7,482	[3]
Bank Collective Trust Funds - Fixed Income [Member] | Bond Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,495	[4]	21,333	[4]
Bank Collective Trust Funds - Fixed Income [Member] | Short Term Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	622		251
Bank Collective Trust Funds - Fixed Income [Member] | Level 2 [Member] | Bond Index Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 21,495	[4]	$ 21,333	[4]

[1] (1)Substantially all of the assets of these funds are invested in large-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

[2] (2)Substantially all of the assets of these funds are invested in small-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

[3] (3)Substantially all of the assets of these funds are invested in international companies in developed markets (excluding the United States and Canada). The remainder of the assets of these funds is invested in cash reserves.

[4] (4)This category represents investment grade bonds of U.S. issuers, including U.S. Treasury notes.