Note 2 - Loans and Allowance for Loan Losses (Details Textual) Pure in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loans Receivable with Variable Rates of Interest	$ 1,640,991,000	$ 1,495,918,000
Loans Receivable with Fixed Rates of Interest	452,051,000	554,281,000
Loans and Leases Receivable, Related Parties, Ending Balance	$ 12,878,000	$ 13,019,000	$ 7,759,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0
Mortgage Loans in Process of Foreclosure, Amount	$ 0	$ 200,000
Loans Originated Into Secondary Market	167,723,000	129,060,000	135,835,000
Gain (Loss) on Sale of Mortgage Loans	6,802,000	4,639,000	$ 4,258,000
Loans Sold With Recourse In Secondary Market	115,789,000	94,801,000
Nonperforming Financial Instruments [Member]
Potential Problem Loans	$ 10,700,000	$ 12,000,000.0
Minimum [Member] \| Real Estate Portfolio Segment [Member]
Financing Receivable, Amortization Period	15 years
Financing Receivable, Maturity Period	5 years
Minimum [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Maturity Period	1 year
Maximum [Member] \| Real Estate Portfolio Segment [Member]
Financing Receivable, Amortization Period	30 years
Financing Receivable, Maturity Period	15 years
Maximum [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Maturity Period	5 years

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

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-Publisher FASB
-Name Accounting Standards Codification
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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Amount of loan with fixed rate of interest.

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Amount of loan with variable or adjustable rate of interest.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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The amortization period of financing receivables.

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The maturity period for financing receivables.

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The amount of originated loans for sale into the secondary market during the period.

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The amuont of loans sold with recourse in the secondary market during the period.

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Loans where the borrowers have experienced financial difficulty and the Company has identified as a potential future loss. Additional monitoring is administered to these loans.

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No definition available.

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