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Note 4 - Credit Quality (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Percentage of Loan Loss Covered by FDIC		80.00%
Financing Receivable, Collectively Evaluated for Impairment		$ 1,700,232		$ 1,755,339
Restructured Loans, Reserves		250
Performing Status Returned Period	180 days
Financing Receivable, Troubled Debt Restructuring, Subsequent Default		0	$ 0
Impaired Loans [Member]
Financing Receivable, Collectively Evaluated for Impairment		21,520		25,270
Non-covered Loans [Member]
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 37		58
Covered Loans [Member]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0			$ 0

X

- Definition

Represents the percentage of loan covered by the FDIC.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

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X

- Definition

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+ References

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+ Details

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
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X

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
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- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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