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Note 3 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Held-to-Maturity    
Held to maturity-Amortized cost $ 861,596 $ 777,587
Held to maturity-Gross unrealized gains 6,515 7,985
Held to maturity-Gross unrealized losses (4,762) (5,039)
Held to maturity-Estimated fair value 863,349 780,533
Available-for-Sale    
Available for sale--Amortized cost 750,005 307,481
Available for sale--Gross unrealized gains 1,483 409
Available for sale--Gross unrealized losses (3,787) (2,607)
Available for sale--Estimated fair value 747,701 305,283
US Government Agencies Debt Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 361,744 418,914
Held to maturity-Gross unrealized gains 1,234 929
Held to maturity-Gross unrealized losses (1,463) (4,055)
Held to maturity-Estimated fair value 361,515 415,788
Available-for-Sale    
Available for sale--Amortized cost 236,700 275,381
Available for sale--Gross unrealized gains 138 15
Available for sale--Gross unrealized losses (835) (2,580)
Available for sale--Estimated fair value 236,003 272,816
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 27,146 29,743
Held to maturity-Gross unrealized gains 130 56
Held to maturity-Gross unrealized losses (240) (411)
Held to maturity-Estimated fair value 27,036 29,388
Available-for-Sale    
Available for sale--Amortized cost 466,060 1,579
Available for sale--Gross unrealized gains 889  
Available for sale--Gross unrealized losses (2,092) (7)
Available for sale--Estimated fair value 464,857 1,572
US States and Political Subdivisions Debt Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 471,631 328,310
Held to maturity-Gross unrealized gains 5,151 7,000
Held to maturity-Gross unrealized losses (3,059) (573)
Held to maturity-Estimated fair value 473,723 334,737
Available-for-Sale    
Available for sale--Amortized cost 10,961 6,536
Available for sale--Gross unrealized gains 29 7
Available for sale--Gross unrealized losses (19) (3)
Available for sale--Estimated fair value 10,971 6,540
Other Securities [Member]    
Held-to-Maturity    
Held to maturity-Amortized cost 1,075 620
Held to maturity-Estimated fair value 1,075 620
Available-for-Sale    
Available for sale--Amortized cost 32,284 19,985
Available for sale--Gross unrealized gains 422 386
Available for sale--Gross unrealized losses (841) (8)
Available for sale--Estimated fair value 31,865 20,363
US Treasury Securities [Member]    
Available-for-Sale    
Available for sale--Amortized cost 4,000 4,000
Available for sale--Gross unrealized gains 5 1
Available for sale--Gross unrealized losses   (9)
Available for sale--Estimated fair value $ 4,005 $ 3,992