Note 4 - Loans and Allowance for Loan Losses (Details) - Retail Credit Risk by Collateral Type (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,068,265,000	$ 1,053,243,000
Originated Loan [Member] | Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	44,917,000	35,080,000
Originated Loan [Member] | Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	37,994,000	31,467,000
Originated Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,186,713,000	1,053,243,000	1,075,487,000
Acquired Loan [Member] | Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	119,033,000	0
Acquired Loan [Member] | Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	179,757,000	0
Acquired Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	881,552,000	0
Retail Home Equity and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	163,950,000	35,080,000
Retail 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 217,751,000	$ 31,467,000