Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Interest paid	$ 15,944	$ 10,178
Income taxes paid	21,039	14,642
Transfers of Loans Not Covered by FDIC Loss Share to Foreclosed Assets Held-for-sale [Member]
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Transfers to foreclosed assets	14,242	3,892
Transfers of Loans Acquired Covered by FDIC Loss Share to Foreclosed Assets Covered by FDIC Loss Share [Member]
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Transfers to foreclosed assets	4,349	5,480
Transfers of Foreclosed Assets Covered by FDIC Loss Share to Foreclosed Assets Held for Sale [Member]
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Transfers to foreclosed assets	13,895	0
Transfers of Loans Acquired Covered by FDIC Loss Share, to Loans Acquired not Covered by FDIC Loss Share [Member]
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Transfers to foreclosed assets	88,922	0
Transfers of Premises Held-for-sale to Foreclosed Assets Held-for-sale [Member]
Note 15 - Additional Cash Flow Information (Details) - Additional Cash Flow Information [Line Items]
Transfers to foreclosed assets	$ 6,126	$ 0