Note 4 - Investment Securities (Detail) - Investment Securities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Securities Held-to-Maturity
Securities Held-to-Maturity, Amortized Cost	$ 773,768	$ 1,153,504
Securities Held-to-Maturity, Gross Unrealized Gains	50,138	50,810
Securities Held-to-Maturity, Gross Unrealized Losses	0	337
Securities Held-to-Maturity, Fair Value	823,906	1,203,977
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	1,290,676	1,309,521
Securities Available-for-sale, Gross Unrealized Gains	14,954	17,410
Securities Available-for-sale, Gross Unrealized Losses	14,150	32,453
Securities Available-for-sale, Fair Value	1,291,480	1,294,478
Total investment securities - Amortized Cost	2,064,444	2,463,025
Total investment securities - Gross Unrealized Gains	65,092	68,220
Total investment securities - Gross Unrealized Losses	14,150	32,790
Total investment securities - Fair Value	2,115,386	2,498,455
State and Municipal Securities [Member]
Securities Held-to-Maturity
Securities Held-to-Maturity, Amortized Cost	129,037	129,577
Securities Held-to-Maturity, Gross Unrealized Gains	9,268	7,053
Securities Held-to-Maturity, Gross Unrealized Losses	0	0
Securities Held-to-Maturity, Fair Value	138,305	136,630
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost		1,869
Securities Available-for-sale, Gross Unrealized Gains		59
Securities Available-for-sale, Gross Unrealized Losses		0
Securities Available-for-sale, Fair Value		1,928
Collateralized Mortgage Backed Securities [Member]
Securities Held-to-Maturity
Securities Held-to-Maturity, Amortized Cost	634,757	913,990
Securities Held-to-Maturity, Gross Unrealized Gains	40,801	42,351
Securities Held-to-Maturity, Gross Unrealized Losses	0	0
Securities Held-to-Maturity, Fair Value	675,558	956,341
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	404,505	325,706
Securities Available-for-sale, Gross Unrealized Gains	12,194	12,361
Securities Available-for-sale, Gross Unrealized Losses	5	436
Securities Available-for-sale, Fair Value	416,694	337,631
Corporate Debt Securities [Member]
Securities Held-to-Maturity
Securities Held-to-Maturity, Amortized Cost	9,974	9,971
Securities Held-to-Maturity, Gross Unrealized Gains	69	0
Securities Held-to-Maturity, Gross Unrealized Losses	0	337
Securities Held-to-Maturity, Fair Value	10,043	9,634
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	349,973	412,045
Securities Available-for-sale, Gross Unrealized Gains	106	113
Securities Available-for-sale, Gross Unrealized Losses	14,102	31,729
Securities Available-for-sale, Fair Value	335,977	380,429
US Treasury Securities [Member]
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	509,748
Securities Available-for-sale, Gross Unrealized Gains	228
Securities Available-for-sale, Gross Unrealized Losses	5
Securities Available-for-sale, Fair Value	509,971
Collateralized Mortgage Obligations [Member]
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	9,772	16,184
Securities Available-for-sale, Gross Unrealized Gains	430	540
Securities Available-for-sale, Gross Unrealized Losses	34	238
Securities Available-for-sale, Fair Value	10,168	16,486
Asset-backed Securities [Member]
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	145	172
Securities Available-for-sale, Gross Unrealized Gains	0	0
Securities Available-for-sale, Gross Unrealized Losses	4	6
Securities Available-for-sale, Fair Value	141	166
Mutual Funds Member
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	6,000	6,000
Securities Available-for-sale, Gross Unrealized Gains	79	48
Securities Available-for-sale, Gross Unrealized Losses	0	13
Securities Available-for-sale, Fair Value	6,079	6,035
Preferred Stock Of Government Sponsored Entities Member
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	569	569
Securities Available-for-sale, Gross Unrealized Gains	1,766	1,085
Securities Available-for-sale, Gross Unrealized Losses	0	0
Securities Available-for-sale, Fair Value	2,335	1,654
Trust Preferred Securities [Member]
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost	9,964	45,501
Securities Available-for-sale, Gross Unrealized Gains	151	486
Securities Available-for-sale, Gross Unrealized Losses	0	24
Securities Available-for-sale, Fair Value	10,115	45,963
U.S. Government Sponsored Entities [Member]
Securities Held-to-Maturity
Securities Held-to-Maturity, Amortized Cost		99,966
Securities Held-to-Maturity, Gross Unrealized Gains		1,406
Securities Held-to-Maturity, Gross Unrealized Losses		0
Securities Held-to-Maturity, Fair Value		101,372
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost		500,007
Securities Available-for-sale, Gross Unrealized Gains		1,226
Securities Available-for-sale, Gross Unrealized Losses		7
Securities Available-for-sale, Fair Value		501,226
Other Equity Securities [Member]
Securities Available-for-Sale
Securities Available-for-sale, Amortized Cost		1,468
Securities Available-for-sale, Gross Unrealized Gains		1,492
Securities Available-for-sale, Gross Unrealized Losses		0
Securities Available-for-sale, Fair Value		$ 2,960

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Investment securities at fair value.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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