Investment Securities (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	$ 48,149
1 to 5 Years, Amortized Cost	95,390
5 to 10 Years, Amortized Cost	1,937,873
More Than 10 years, Amortized Cost	974,529
No Stated Maturity, Amortized Cost	5,327
Total, Amortized Cost	3,061,268
Within One Year, Fair Value	48,312
1 to 5 Years, Fair Value	96,771
5 to 10 Years, Fair Value	1,938,995
More Than 10 years, Fair Value	987,257
No Stated Maturity, Fair Value	8,850
Total, Fair Value	3,080,185
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	17,793
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	17,793
Within One Year, Fair Value	17,793
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	17,793
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	114
1 to 5 Years, Amortized Cost	9,097
5 to 10 Years, Amortized Cost	24,053
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	33,264
Within One Year, Fair Value	114
1 to 5 Years, Fair Value	9,414
5 to 10 Years, Fair Value	24,764
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	34,292
Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	30,030
1 to 5 Years, Amortized Cost	81,765
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	111,795
Within One Year, Fair Value	30,187
1 to 5 Years, Fair Value	82,622
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	112,809
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	15
1 to 5 Years, Amortized Cost	1
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	173,280
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	173,296
Within One Year, Fair Value	15
1 to 5 Years, Fair Value	1
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	174,362
No Stated Maturity, Fair Value	0
Total, Fair Value	174,378
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	102
1 to 5 Years, Amortized Cost	2,429
5 to 10 Years, Amortized Cost	1,913,531
More Than 10 years, Amortized Cost	411,673
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	2,327,735
Within One Year, Fair Value	108
1 to 5 Years, Fair Value	2,595
5 to 10 Years, Fair Value	1,913,923
More Than 10 years, Fair Value	421,669
No Stated Maturity, Fair Value	0
Total, Fair Value	2,338,295
Collateralized Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	384,836
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	384,836
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	386,473
No Stated Maturity, Fair Value	0
Total, Fair Value	386,473
State And Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	95
1 to 5 Years, Amortized Cost	2,098
5 to 10 Years, Amortized Cost	289
More Than 10 years, Amortized Cost	2,740
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	5,222
Within One Year, Fair Value	95
1 to 5 Years, Fair Value	2,139
5 to 10 Years, Fair Value	308
More Than 10 years, Fair Value	2,887
No Stated Maturity, Fair Value	0
Total, Fair Value	5,429
Securities With No Stated Maturity (Equity Securities) [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	3,228
Total, Amortized Cost	3,228
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	6,953
Total, Fair Value	6,953
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	2,000
No Stated Maturity, Amortized Cost	2,099
Total, Amortized Cost	4,099
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	1,866
No Stated Maturity, Fair Value	1,897
Total, Fair Value	$ 3,763