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Note 3 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Held-to-Maturity    
Held to maturity-Amortized cost $ 776,294 $ 777,587
Held to maturity-Gross unrealized gains 9,643 7,985
Held to maturity-Gross unrealized losses (908) (5,039)
Held to maturity-Estimated fair value 785,029 780,533
Available-for-Sale    
Available for sale--Amortized cost 698,875 307,481
Available for sale--Gross unrealized gains 5,781 409
Available for sale--Gross unrealized losses (1,309) (2,607)
Available for sale--Estimated fair value 703,347 305,283
US Government Agencies Debt Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 285,071 418,914
Held to maturity-Gross unrealized gains 1,189 929
Held to maturity-Gross unrealized losses (393) (4,055)
Held to maturity-Estimated fair value 285,867 415,788
Available-for-Sale    
Available for sale--Amortized cost 153,610 275,381
Available for sale--Gross unrealized gains 225 15
Available for sale--Gross unrealized losses (259) (2,580)
Available for sale--Estimated fair value 153,576 272,816
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 25,913 29,743
Held to maturity-Gross unrealized gains 301 56
Held to maturity-Gross unrealized losses (88) (411)
Held to maturity-Estimated fair value 26,126 29,388
Available-for-Sale    
Available for sale--Amortized cost 497,847 1,579
Available for sale--Gross unrealized gains 4,756 0
Available for sale--Gross unrealized losses (259) (7)
Available for sale--Estimated fair value 502,344 1,572
US States and Political Subdivisions Debt Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 464,245 328,310
Held to maturity-Gross unrealized gains 8,153 7,000
Held to maturity-Gross unrealized losses (427) (573)
Held to maturity-Estimated fair value 471,971 334,737
Available-for-Sale    
Available for sale--Amortized cost 10,898 6,536
Available for sale--Gross unrealized gains 78 7
Available for sale--Gross unrealized losses 0 (3)
Available for sale--Estimated fair value 10,976 6,540
Other Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 1,065 620
Held to maturity-Gross unrealized gains 0 0
Held to maturity-Gross unrealized losses 0 0
Held to maturity-Estimated fair value 1,065 620
Available-for-Sale    
Available for sale--Amortized cost 32,520 19,985
Available for sale--Gross unrealized gains 714 386
Available for sale--Gross unrealized losses (791) (8)
Available for sale--Estimated fair value 32,443 20,363
US Treasury Securities [Member]    
Available-for-Sale    
Available for sale--Amortized cost 4,000 4,000
Available for sale--Gross unrealized gains 8 1
Available for sale--Gross unrealized losses 0 (9)
Available for sale--Estimated fair value $ 4,008 $ 3,992