Note 3 - Securities (Details) - Available-for-sale Securities (USD $)	Jun. 30, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 479,435,000		$ 139,487,000
Securities available for sale, gross unrealized gains	2,989,000		1,791,000
Securities available for sale, gross unrealized losses	(7,149,000)		(10,100,000)
Securities available for sale	475,275,000	[1]	131,178,000	[1]
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	219,141,000		108,279,000
Securities available for sale, gross unrealized gains	731,000		263,000
Securities available for sale, gross unrealized losses	(6,166,000)		(10,065,000)
Securities available for sale	213,706,000		98,477,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	107,145,000		12,456,000
Securities available for sale, gross unrealized gains	1,249,000		1,102,000
Securities available for sale, gross unrealized losses	(222,000)		0
Securities available for sale	108,172,000		13,558,000
Municipal General Obligation Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	139,996,000		16,488,000
Securities available for sale, gross unrealized gains	894,000		388,000
Securities available for sale, gross unrealized losses	(721,000)		(4,000)
Securities available for sale	140,169,000		16,872,000
Municipal Revenue Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	11,244,000		878,000
Securities available for sale, gross unrealized gains	115,000		38,000
Securities available for sale, gross unrealized losses	(35,000)		0
Securities available for sale	11,324,000		916,000
Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	1,909,000
Securities available for sale, gross unrealized gains	0
Securities available for sale, gross unrealized losses	(5,000)
Securities available for sale	1,904,000
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost			1,386,000
Securities available for sale, gross unrealized gains			0
Securities available for sale, gross unrealized losses			(31,000)
Securities available for sale			$ 1,355,000

[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.