Securities (Amortized Cost And Fair Value Of Securities, By Contractual Maturities) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 19,598
Available for Sale, Due from one to five years, Amortized Cost	346,533
Available for Sale, Due from five to ten years, Amortized Cost	16,700
Available for Sale, Due after ten years, Amortized Cost	56,133
Available for Sale, with contractual maturities, Amortized Cost	438,964
Total securities available for sale, Amortized Cost	1,072,411	645,658
Available for Sale, Due in one year or less, Fair Value	19,641
Available for Sale, Due from one to five years, Fair Value	348,008
Available for Sale, Due from five to ten years, Fair Value	17,734
Available for Sale, Due after ten years, Fair Value	41,493
Available for Sale, with contractual maturities, Fair Value	426,876
Total available for sale Securities, Fair Value	1,071,924	640,571
Held to Maturity, Due in one year or less, Amortized Cost	6,696
Held to Maturity, Due from one to five years, Amortized Cost	10,901
Held to Maturity, Due from five to ten years, Amortized Cost	47,742
Held to Maturity, Due after ten years, Amortized Cost	94,716
Held to Maturity, with contractual maturities, Amortized Cost	160,055
Held to Maturity, with contractual maturities, Amortized Cost	1,203,240	917,212
Held to Maturity, Due in one year or less, Fair Value	6,813
Held to Maturity, Due from one to five years, Fair Value	11,336
Held to Maturity, Due from five to ten years, Fair Value	49,836
Held to Maturity, Due after ten years, Fair Value	98,365
Held to Maturity, with contractual maturities, Fair Value	166,350
Held to Maturity, with contractual maturities, Fair Value	1,240,956	952,033
Agency Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	321,892	166,758
Total available for sale Securities, Fair Value	329,326	171,611
Held to Maturity, with contractual maturities, Amortized Cost	915,239
Held to Maturity, with contractual maturities, Fair Value	946,523
Agency Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	306,733	181,493
Total available for sale Securities, Fair Value	310,517	183,729
Held to Maturity, with contractual maturities, Amortized Cost	109,107
Held to Maturity, with contractual maturities, Fair Value	110,074
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	3,267	31
Total available for sale Securities, Fair Value	3,254	30
Held to Maturity, with contractual maturities, Amortized Cost	17,814
Held to Maturity, with contractual maturities, Fair Value	16,971
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, with contractual maturities, Amortized Cost	1,025
Held to Maturity, with contractual maturities, Fair Value	1,038
Equity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Total securities available for sale, Amortized Cost	1,555	1,593
Total available for sale Securities, Fair Value	$ 1,951	$ 1,827

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