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Securities (Amortized Cost And Fair Value Of Securities, By Contractual Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 27,164
Available for Sale, Due in one year or less, Fair Value	27,213
Available for Sale, Due from one to five years, Amortized Cost	346,262
Available for Sale, Due from one to five years, Fair Value	346,200
Available for Sale, Due from five to ten years, Amortized Cost	21,405
Available for Sale, Due from five to ten years, Fair Value	22,401
Available for Sale, Due after ten years, Amortized Cost	64,617
Available for Sale, Due after ten years, Fair Value	50,753
Available for Sale, with contractual maturities, Amortized Cost	459,448
Available for Sale, with contractual maturities, Fair Value	446,567
Total securities available for sale, Amortized Cost	1,101,523	645,658
Total available for sale Securities, Fair Value	1,097,801	640,571
Held to Maturity, Due in one year or less, Amortized Cost	7,731
Held to Maturity, Due in one year or less, Fair Value	7,826
Held to Maturity, Due from one to five years, Amortized Cost	12,313
Held to Maturity, Due from one to five years, Fair Value	12,873
Held to Maturity, Due from five to ten years, Amortized Cost	43,678
Held to Maturity, Due from five to ten years, Fair Value	45,470
Held to Maturity, Due after ten years, Amortized Cost	91,596
Held to Maturity, Due after ten years, Fair Value	95,445
Held to Maturity, Amortized Cost, total	1,178,558	917,212
Securities Held To Maturity, Fair Value	1,212,826	952,033
Held to Maturity, with contractual maturities, Amortized Cost	155,318
Held to Maturity, with contractual maturities, Fair Value	161,614
Agency Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	337,045	166,758
Total available for sale Securities, Fair Value	342,654	171,611
Held to Maturity, with contractual maturities, Amortized Cost	888,484
Held to Maturity, with contractual maturities, Fair Value	917,019
Agency Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	299,109	181,493
Total available for sale Securities, Fair Value	302,330	183,729
Held to Maturity, with contractual maturities, Amortized Cost	115,104
Held to Maturity, with contractual maturities, Fair Value	115,747
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	3,866	31
Total available for sale Securities, Fair Value	3,842	30
Held to Maturity, with contractual maturities, Amortized Cost	19,652
Held to Maturity, with contractual maturities, Fair Value	18,446
Equity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	2,055	1,593
Total available for sale Securities, Fair Value	$ 2,408	$ 1,827

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