Note 10 - Other Borrowings and Subordinated Debentures (Details) - Debt - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Borrowings
Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured	$ 52,300	$ 43,100
Total other borrowings	162,289	114,682
Subordinated Debentures
Trust preferred securities	60,570	20,620
Total other borrowings and subordinated debentures	222,859	135,302
Federal Home Loan Bank Advances [Member]
Other Borrowings
FHLB advances, net of discount, due 2016 to 2033, 0.35% to 7.37% secured by residential real estate loans	109,989	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	9,723
Trust Preferred Securities Due 9/15/2037 [Member]
Subordinated Debentures
Trust preferred securities	9,975
Trust Preferred Securities Due 12/3/2033 [Member]
Subordinated Debentures
Trust preferred securities	5,167
Trust Preferred Securities Due 12/13/2034 [Member]
Subordinated Debentures
Trust preferred securities	5,063
Trust Preferred Securities, Due 6/6/2037 [Member]
Subordinated Debentures
Trust preferred securities	$ 10,022