Note 2 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Loans, gross	$ 2,297,104	$ 2,093,042	$ 1,989,765
Net deferred loan fees	(8,909)	(7,141)
Total loans	2,288,195	2,085,901
Less: Allowance for loan losses	(35,441)	(28,726)	(28,385)	$ (27,174)
Net loans	2,252,754	2,057,175
Real Estate Portfolio Segment [Member]
Loans, gross	2,035,408	1,929,325
Real Estate Portfolio Segment [Member] \| Residential 1 to 4 Family [Member]
Loans, gross	531,485	511,250	468,772
Less: Allowance for loan losses	(7,981)	(7,144)	(6,588)	(6,297)
Real Estate Portfolio Segment [Member] \| Multifamily Real Estate [Member]
Loans, gross	123,650	97,104	106,072
Less: Allowance for loan losses	(1,645)	(1,117)	(1,220)	(1,481)
Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Loans, gross	846,521	793,379	745,080
Less: Allowance for loan losses	(15,279)	(11,114)	(11,385)	(9,753)
Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Loans, gross	430,599	425,185	410,494
Less: Allowance for loan losses	(6,564)	(5,997)	(5,928)	(7,084)
Real Estate Portfolio Segment [Member] \| Farmland [Member]
Loans, gross	16,422	19,268	20,425
Less: Allowance for loan losses	(164)	(187)	(198)	(221)
Real Estate Portfolio Segment [Member] \| Second Mortgages [Member]
Loans, gross	9,239	10,760	11,204
Less: Allowance for loan losses	(115)	(123)	(129)	(118)
Real Estate Portfolio Segment [Member] \| Home Equity Line of Credit [Member]
Loans, gross	77,492	72,379	69,666
Less: Allowance for loan losses	(981)	(889)	(854)	(731)
Commercial Portfolio Segment [Member]
Loans, gross	189,655	98,265	90,450
Less: Allowance for loan losses	(1,236)	(1,044)	$ (960)	$ (622)
Agricultural Portfolio Segment [Member]
Loans, gross	1,318	1,569
Consumer Portfolio Segment [Member]
Loans, gross	61,249	54,834
Consumer Portfolio Segment [Member] \| Personal Loan [Member]
Loans, gross	57,170	50,532
Consumer Portfolio Segment [Member] \| Credit Card Receivable [Member]
Loans, gross	4,079	4,302
Unallocated Financing Receivables [Member]
Loans, gross	$ 9,474	$ 9,049

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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