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Note 6 - Loans and the Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investment in Loans Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Beginning Balance $ 11,220 $ 8,765 $ 8,765  
Charge-offs (57)   (472)  
Recoveries 22   537  
Provision 633 474 2,390  
Ending Balance 11,818   11,220  
Allowance for credit losses, individually evaluated for impairment 1,355   1,280  
Allowance for credit losses, collectively evaluated for impairment 10,463   9,940  
Allowance for credit losses, purchased credit impaired [1]    
Loans receivable 1,586,182   1,528,469  
Loans receivable, individually evaluated for impairment 13,739   12,360  
Loans receivable, collectively evaluated for impairment 1,564,458   1,505,405  
Loans receivable, purchased credit impaired 7,985 [1]   10,704 [1] $ 696
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]        
Beginning Balance 1,590 1,421 1,421  
Charge-offs (2)   (90)  
Recoveries   398  
Provision 12   (139)  
Ending Balance 1,600   1,590  
Allowance for credit losses, individually evaluated for impairment 2    
Allowance for credit losses, collectively evaluated for impairment 1,598   1,590  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 211,888   211,054  
Loans receivable, individually evaluated for impairment 109   32  
Loans receivable, collectively evaluated for impairment 211,779   211,022  
Loans receivable, purchased credit impaired [1]    
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]        
Beginning Balance 104 76 76  
Charge-offs (2)   0  
Recoveries 0   0  
Provision 3   28  
Ending Balance 105   104  
Allowance for credit losses, individually evaluated for impairment 3   0  
Allowance for credit losses, collectively evaluated for impairment 102   104  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 44,066   45,989  
Loans receivable, individually evaluated for impairment 202   112  
Loans receivable, collectively evaluated for impairment 43,700   45,713  
Loans receivable, purchased credit impaired [1] 164   164  
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]        
Beginning Balance 2,715 2,323 2,323  
Charge-offs (10)    
Recoveries   13  
Provision 144   379  
Ending Balance 2,849   2,715  
Allowance for credit losses, individually evaluated for impairment 18   47  
Allowance for credit losses, collectively evaluated for impairment 2,831   2,668  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 550,103   518,660  
Loans receivable, individually evaluated for impairment 4,405   4,155  
Loans receivable, collectively evaluated for impairment 538,682   507,506  
Loans receivable, purchased credit impaired [1] 7,016   6,999  
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member]        
Beginning Balance 1,538 1,284 1,284  
Charge-offs (10)   (294)  
Recoveries 7   18  
Provision 39   530  
Ending Balance 1,574   1,538  
Allowance for credit losses, individually evaluated for impairment 143   96  
Allowance for credit losses, collectively evaluated for impairment 1,431   1,442  
Allowance for credit losses, purchased credit impaired [1]    
Loans receivable 275,610   270,583  
Loans receivable, individually evaluated for impairment 2,958   2,728  
Loans receivable, collectively evaluated for impairment 272,557   267,761  
Loans receivable, purchased credit impaired [1] 95   94  
Residential Portfolio Segment [Member] | Multi-family Residential [Member]        
Beginning Balance 236 144 144  
Charge-offs 0   0  
Recoveries 0   0  
Provision (1)   92  
Ending Balance 235   236  
Allowance for credit losses, individually evaluated for impairment 0   0  
Allowance for credit losses, collectively evaluated for impairment 235   236  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 39,548   39,273  
Loans receivable, individually evaluated for impairment 0   0  
Loans receivable, collectively evaluated for impairment 39,548   39,273  
Loans receivable, purchased credit impaired [1] 0   0  
Commercial Portfolio Segment [Member]        
Beginning Balance 4,453 3,147 3,147  
Charge-offs (20)    
Recoveries 5   28  
Provision 448   1,278  
Ending Balance 4,886   4,453  
Allowance for credit losses, individually evaluated for impairment 1,115   1,112  
Allowance for credit losses, collectively evaluated for impairment 3,771   3,341  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 389,855   363,640  
Loans receivable, individually evaluated for impairment 5,865   5,208  
Loans receivable, collectively evaluated for impairment 383,280   354,985  
Loans receivable, purchased credit impaired [1] 710   3,447  
Consumer Portfolio Segment [Member]        
Beginning Balance 584 $ 370 370  
Charge-offs (13)   (88)  
Recoveries 10   80  
Provision (12)   222  
Ending Balance 569   584  
Allowance for credit losses, individually evaluated for impairment 74   25  
Allowance for credit losses, collectively evaluated for impairment 495   559  
Allowance for credit losses, purchased credit impaired [1] 0   0  
Loans receivable 75,112   79,270  
Loans receivable, individually evaluated for impairment 200   125  
Loans receivable, collectively evaluated for impairment 74,912   79,145  
Loans receivable, purchased credit impaired [1] $ 0   $ 0  
[1] Purchased credit impaired loans are evaluated for impairment on an individual basis.