Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Investment Securities [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 20,802
Debt securities available for sale, Due from one to five years, Amortized Cost	95,759
Debt securities available for sale, Due after five years through ten years, Amortized Cost	365,312
Debt securities available for sale, Due after ten years, Amortized Cost	348,802
Debt securities available for sale, Amortized Cost	830,675
Debt securities available for sale, Due in one year or less, Fair Value	20,894
Debt securities available for sale, Due from one to five years, Fair Value	99,825
Debt securities available for sale, Due after five years through ten years, Fair Value	373,338
Debt securities available for sale, Due after ten years, Fair Value	359,380
Debt securities available for sale, Fair Value	853,437
Debt securities held to maturity, Due in one year or less, Amortized Cost	12,740
Debt securities held to maturity, Due from one to five years, Amortized Cost	4,212
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	708
Debt securities held to maturity, Due after ten years, Amortized Cost	87
Debt securities held to maturity, Amortized Cost	17,747
Debt securities held to maturity, Due in one year or less, Fair Value	12,818
Debt securities held to maturity, Due from one to five years, Fair Value	4,474
Debt securities held to maturity, Due after five years through ten years, Fair Value	852
Debt securities held to maturity, Due after ten years, Fair Value	116
Debt securities held to maturity, Fair Value	$ 18,260

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.