Securities (Amortized Cost And Fair Value Of Securities, By Contractual Maturities) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 4,904
Available for Sale, Due from one to five years, Amortized Cost	268,114
Available for Sale, Due from five to ten years, Amortized Cost	105,308
Available for Sale, Due after ten years, Amortized Cost	52,771
Available for Sale, with contractual maturities, Amortized Cost	431,097
Total securities available for sale, Amortized Cost	1,163,457	1,170,439
Available for Sale, Due in one year or less, Fair Value	4,909
Available for Sale, Due from one to five years, Fair Value	269,946
Available for Sale, Due from five to ten years, Fair Value	106,050
Available for Sale, Due after ten years, Fair Value	40,312
Available for Sale, with contractual maturities, Fair Value	421,217
Total available for sale Securities, Fair Value	1,164,327	1,172,683
Held to Maturity, Due in one year or less, Amortized Cost	4,863
Held to Maturity, Due from one to five years, Amortized Cost	17,960
Held to Maturity, Due from five to ten years, Amortized Cost	86,216
Held to Maturity, Due after ten years, Amortized Cost	77,602
Securities Held To Maturity, with contractual maturities, Fair Value	186,641
Held to Maturity, with contractual maturities, Amortized Cost	1,110,556	1,106,563
Held to Maturity, Due in one year or less, Fair Value	4,921
Held to Maturity, Due from one to five years, Fair Value	18,297
Held to Maturity, Due from five to ten years, Fair Value	88,238
Held to Maturity, Due after ten years, Fair Value	80,714
Securities Held To Maturity, with contractual maturities, Fair Value	192,170
Held to Maturity, with contractual maturities, Fair Value	1,141,223	1,143,213
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	227,465	267,575
Total available for sale Securities, Fair Value	234,288	275,150
Held to Maturity, with contractual maturities, Amortized Cost	692,631
Held to Maturity, with contractual maturities, Fair Value	716,596
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	500,955	465,574
Total available for sale Securities, Fair Value	504,335	469,547
Held to Maturity, with contractual maturities, Amortized Cost	221,081
Held to Maturity, with contractual maturities, Fair Value	222,121
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	2,386	2,679
Total available for sale Securities, Fair Value	2,413	2,729
Held to Maturity, with contractual maturities, Amortized Cost	9,180
Held to Maturity, with contractual maturities, Fair Value	9,285
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Held to Maturity, with contractual maturities, Amortized Cost	1,023
Held to Maturity, with contractual maturities, Fair Value	1,051
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,554	1,554
Total available for sale Securities, Fair Value	$ 2,074	$ 2,007

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