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Note 4 - Credit Quality (Details Textual) $ in Thousands		3 Months Ended
		Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Percentage of Loan Loss Covered by FDIC		80.00%
Financing Receivable, Collectively Evaluated for Impairment		$ 1,764,457		$ 1,785,574
Impaired Financing Receivable, Recorded Investment, Total	[1]	36,182		33,301
Restructured Loans, Reserves		$ 250
Performing Status Returned Period		180 days
Financing Receivable, Modifications, Recorded Investment		$ 9,303		9,663
Financing Receivable, Modifications, Number of Contracts		0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0	$ 0
Financial Asset Acquired with Credit Deterioration [Member]
Impaired Financing Receivable, Recorded Investment, Total		0		0
Impaired Loans [Member]
Financing Receivable, Collectively Evaluated for Impairment		25,060		20,130
Non-covered Loans [Member]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		27		1
Covered Loans [Member]
Financing Receivable, Modifications, Recorded Investment		$ 0		$ 0
[1] Includes loans totaling $20.18 million as of March 31, 2018, and $20.13 million as of December 31, 2017, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment

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