Note 4 - Loans and Allowance for Loan Losses (Details) - Retail Credit Risk by Collateral Type (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,073,482,000	$ 1,053,243,000
Originated Loan [Member] | Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	35,151,000	35,080,000
Originated Loan [Member] | Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	33,337,000	31,467,000
Originated Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,145,097,000	1,053,243,000	1,058,662,000
Acquired Loan [Member] | Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	134,557,000	0
Acquired Loan [Member] | Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	182,702,000	0
Acquired Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	928,385,000	0
Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	169,708,000	35,080,000
Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 216,039,000	$ 31,467,000