Note 6 - Investment Securities (Detail) - Schedule of Investment Securities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Securities Held-to-Maturity, Amortized Cost	$ 1,084,708	$ 1,153,504
Securities Held-to-Maturity, Gross Unrealized Gains	46,862	50,810
Securities Held-to-Maturity, Gross Unrealized Losses	46	337
Securities Held-to-Maturity, Fair Value	1,131,524	1,203,977
Securities Available-for-sale, Amortized Cost	1,361,571	1,309,521
Securities Available-for-sale, Gross Unrealized Gains	16,371	17,410
Securities Available-for-sale, Gross Unrealized Losses	24,200	32,453
Securities Available-for-sale, Fair Value	1,353,742	1,294,478
Total investment securities - Amortized Cost	2,446,279	2,463,025
Total investment securities - Gross Unrealized Gains	63,233	68,220
Total investment securities - Gross Unrealized Losses	24,246	32,790
Total investment securities - Fair Value	2,485,266	2,498,455
U.S. Government Sponsored Entities [Member]
Securities Held-to-Maturity, Amortized Cost	99,978	99,966
Securities Held-to-Maturity, Gross Unrealized Gains	945	1,406
Securities Held-to-Maturity, Gross Unrealized Losses		0
Securities Held-to-Maturity, Fair Value	100,923	101,372
Securities Available-for-sale, Amortized Cost	300,000	500,007
Securities Available-for-sale, Gross Unrealized Gains	270	1,226
Securities Available-for-sale, Gross Unrealized Losses	106	7
Securities Available-for-sale, Fair Value	300,164	501,226
State and Municipal Securities [Member]
Securities Held-to-Maturity, Amortized Cost	129,444	129,577
Securities Held-to-Maturity, Gross Unrealized Gains	6,057	7,053
Securities Held-to-Maturity, Fair Value	135,501	136,630
Securities Available-for-sale, Amortized Cost		1,869
Securities Available-for-sale, Gross Unrealized Gains		59
Securities Available-for-sale, Fair Value		1,928
Collateralized Mortgage Backed Securities [Member]
Securities Held-to-Maturity, Amortized Cost	845,314	913,990
Securities Held-to-Maturity, Gross Unrealized Gains	39,860	42,351
Securities Held-to-Maturity, Fair Value	885,174	956,341
Securities Available-for-sale, Amortized Cost	493,043	325,706
Securities Available-for-sale, Gross Unrealized Gains	9,889	12,361
Securities Available-for-sale, Gross Unrealized Losses	537	436
Securities Available-for-sale, Fair Value	502,395	337,631
Corporate Debt Securities [Member]
Securities Held-to-Maturity, Amortized Cost	9,972	9,971
Securities Held-to-Maturity, Gross Unrealized Gains		0
Securities Held-to-Maturity, Gross Unrealized Losses	46	337
Securities Held-to-Maturity, Fair Value	9,926	9,634
Securities Available-for-sale, Amortized Cost	410,195	412,045
Securities Available-for-sale, Gross Unrealized Gains	552	113
Securities Available-for-sale, Gross Unrealized Losses	23,397	31,729
Securities Available-for-sale, Fair Value	387,350	380,429
US Treasury Securities [Member]
Securities Available-for-sale, Amortized Cost	99,904
Securities Available-for-sale, Gross Unrealized Losses	49
Securities Available-for-sale, Fair Value	99,855
Collateralized Mortgage Obligations [Member]
Securities Available-for-sale, Amortized Cost	14,234	16,184
Securities Available-for-sale, Gross Unrealized Gains	519	540
Securities Available-for-sale, Gross Unrealized Losses	90	238
Securities Available-for-sale, Fair Value	14,663	16,486
Asset-backed Securities [Member]
Securities Available-for-sale, Amortized Cost	164	172
Securities Available-for-sale, Gross Unrealized Gains		0
Securities Available-for-sale, Gross Unrealized Losses	5	6
Securities Available-for-sale, Fair Value	159	166
Mutual Funds Member
Securities Available-for-sale, Amortized Cost	6,000	6,000
Securities Available-for-sale, Gross Unrealized Gains	40	48
Securities Available-for-sale, Gross Unrealized Losses	16	13
Securities Available-for-sale, Fair Value	6,024	6,035
Preferred Stock Of Government Sponsored Entities Member
Securities Available-for-sale, Amortized Cost	569	569
Securities Available-for-sale, Gross Unrealized Gains	1,056	1,085
Securities Available-for-sale, Gross Unrealized Losses		0
Securities Available-for-sale, Fair Value	1,625	1,654
Trust Preferred Securities [Member]
Securities Available-for-sale, Amortized Cost	35,993	45,501
Securities Available-for-sale, Gross Unrealized Gains	853	486
Securities Available-for-sale, Gross Unrealized Losses		24
Securities Available-for-sale, Fair Value	36,846	45,963
Other Equity Securities [Member]
Securities Available-for-sale, Amortized Cost	1,469	1,468
Securities Available-for-sale, Gross Unrealized Gains	3,192	1,492
Securities Available-for-sale, Gross Unrealized Losses		0
Securities Available-for-sale, Fair Value	$ 4,661	$ 2,960

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