Note 17 - Branch Acquisition (Details) - Assessment of Consideration Transferred, Assets Purchased, and Liabilities Assumed - Bank of America Branches [Member] - USD ($) $ in Thousands		3 Months Ended
	Mar. 11, 2016	Mar. 31, 2016
Consideration paid:
Cash paid	$ 6,700	$ 6,707
Total consideration		6,707
Assets acquired:
Cash and cash equivalents		149,066
Premises and equipment, net		4,190
Other assets		200
Core deposit intangibles		1,772
Total assets acquired	155,200	155,228
Liabilities assumed:
Deposits		149,045
Other liabilities		193
Total liabilities assumed	$ 149,200	149,238
Net identifiable assets acquired over liabilities assumed		5,990
Goodwill		717
Portion at Other than Fair Value Measurement [Member]
Assets acquired:
Cash and cash equivalents		149,066
Premises and equipment, net		1,835
Other assets		200
Total assets acquired		151,101
Liabilities assumed:
Deposits		149,045
Other liabilities		21
Total liabilities assumed		149,066
Net identifiable assets acquired over liabilities assumed		2,035
Changes Measurement [Member]
Assets acquired:
Premises and equipment, net		2,355
Core deposit intangibles		1,772
Total assets acquired		4,127
Liabilities assumed:
Other liabilities		172
Total liabilities assumed		172
Net identifiable assets acquired over liabilities assumed		$ 3,955