Note 10 - Other Borrowings and Subordinated Debentures (Details) - Debt - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other Borrowings
Notes payable, due 7/31/2015 to 12/31/2016, 3.25%, floating rate, unsecured	$ 41,572	$ 43,100
	171,321	114,682
Subordinated Debentures
Trust preferred securities	61,794	20,620
Total other borrowings and subordinated debentures	233,115	135,302
Federal Home Loan Bank Advances [Member]
Other Borrowings
FHLB advances, net of discount, due 2015 to 2033, 0.35% to 7.38% secured by residential real estate loans	129,749	71,582
Trust Preferred Securities Due 12/30/2033 [Member]
Subordinated Debentures
Trust preferred securities	20,620	$ 20,620
Trust Preferred Securities Due 6/30/2035 [Member]
Subordinated Debentures
Trust preferred securities	11,110
Trust Preferred Securities Due 9/15/2037 [Member]
Subordinated Debentures
Trust preferred securities	9,898
Trust Preferred Securities Due 12/3/2033 [Member]
Subordinated Debentures
Trust preferred securities	5,169
Trust Preferred Securities Due 12/13/2034 [Member]
Subordinated Debentures
Trust preferred securities	5,041
Trust Preferred Securities, Due 6/6/2037 [Member]
Subordinated Debentures
Trust preferred securities	$ 9,956