Note 12 - Fair Values of Financial Instruments (Details) - Fair Value Hierarchy of Financial Instruments (USD $)	Jun. 30, 2014		Dec. 31, 2013
Financial assets:
Securities available for sale	$ 475,275,000	[1]	$ 131,178,000	[1]
FHLB stock	19,226,000	[2]	11,961,000	[2]
FHLB stock	19,226,000	[2]	11,961,000	[2]
Bank owned life insurance	55,693,000		51,377,000
Accrued interest receivable	7,711,000		3,649,000
Financial liabilities:
Deposits	2,303,261,000		1,118,911,000
Repurchase agreements	124,108,000		69,305,000
Accrued interest payable	10,252,000		5,815,000
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash	14,040,000		1,464,000
Cash	14,040,000		1,464,000
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash equivalents	104,813,000		145,501,000
Cash equivalents	104,813,000		145,501,000
Bank owned life insurance	55,693,000		51,377,000
Bank owned life insurance	55,693,000		51,377,000
Accrued interest receivable	7,711,000		3,649,000
Accrued interest receivable	7,711,000		3,649,000
Financial liabilities:
Deposits	2,305,253,000		1,120,576,000
Deposits	2,303,261,000		1,118,911,000
Repurchase agreements	124,108,000		69,305,000
Repurchase agreements	124,108,000		69,305,000
FHLB advances	57,235,000		45,139,000
FHLB advances	57,044,000		45,000,000
Subordinated debentures	54,087,000		32,974,000
Subordinated debentures	54,131,000		32,990,000
Accrued interest payable	2,159,000		2,041,000
Accrued interest payable	2,159,000		2,041,000
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	2,049,625,000		1,027,300,000
Loans, net	2,052,626,000		1,030,422,000
Interest Rate Swap [Member]
Financial liabilities:
Interest rate swap	390,000	[1]	264,000	[1]
Interest rate swap	$ 390,000	[1]	$ 264,000	[1]

[1] See Note 13 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.

[2] It is not practical to determine the fair value of FHLB stock due to transferability restrictions.