Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles [Line Items]
Goodwill	$ 108,158	$ 78,529
Net carrying amount	22,988	14,972
Total goodwill and other intangible assets	131,146	93,501
Core Deposit Premium [Member]
Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles [Line Items]
Gross carrying amount	18,318	15,245
Accumulated amortization	(2,039)	(2,237)
Net carrying amount	16,279	13,008
Purchased Credit Card Relationships [Member]
Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles [Line Items]
Gross carrying amount	2,068	2,068
Accumulated amortization	(414)	(104)
Net carrying amount	1,654	1,964
Books of Business Intangible [Member]
Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles [Line Items]
Gross carrying amount	5,041
Net carrying amount	5,041
Other Intangible Assets [Member]
Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill and Other Intangibles [Line Items]
Net carrying amount	$ 14