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Note 6 - Allowances for Loan and Lease Losses and Real Estate Losses - Loans Receivable Balances Disaggregated By Impairment Method (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 13, 2014
Dec. 31, 2013
Allowance for Loan and Lease Losses Individually Evaluated for Impairment $ 567 $ 1,061      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 14,424 11,974      
Allowance for Loan and Lease Losses Purchased Credit Impaired 15,584 14,550 $ 13,660   $ 12,711
Loan Balances Individually Evaluated for Impairment 22,180 19,624      
Loan Balances Collectively Evaluated for Impairment 1,521,340 1,422,123      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 12,384 16,347   $ 21,105  
Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 593 1,515 357   0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 12,384 16,347      
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 74 83      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 3,822 3,787      
Allowance for Loan and Lease Losses Purchased Credit Impaired 3,896 3,870 4,488   4,549
Loan Balances Individually Evaluated for Impairment 6,906 6,660      
Loan Balances Collectively Evaluated for Impairment 379,487 391,187      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 2,714 3,189   4,728  
Real Estate Portfolio Segment [Member] | One-to-Four-Family Residential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 277 381      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 2,714 3,189      
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 0 0      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 962 665      
Allowance for Loan and Lease Losses Purchased Credit Impaired 962 665 791   1,001
Loan Balances Individually Evaluated for Impairment 0 230      
Loan Balances Collectively Evaluated for Impairment 92,460 73,996      
Real Estate Portfolio Segment [Member] | Multifamily Residential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 0 0      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0      
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 0 522      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 3,210 3,077      
Allowance for Loan and Lease Losses Purchased Credit Impaired 3,210 3,599 4,243   4,271
Loan Balances Individually Evaluated for Impairment 9,421 6,638      
Loan Balances Collectively Evaluated for Impairment 478,176 471,160      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 7,576 9,886   10,790  
Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 89 552      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 7,576 9,886      
Real Estate Portfolio Segment [Member] | Farmland [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 0 112      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 863 602      
Allowance for Loan and Lease Losses Purchased Credit Impaired 863 714 342   158
Loan Balances Individually Evaluated for Impairment 783 972      
Loan Balances Collectively Evaluated for Impairment 93,182 93,193      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 53 70   95  
Real Estate Portfolio Segment [Member] | Farmland [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 0 0      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 53 70      
Real Estate Portfolio Segment [Member] | Construction Loans [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 0 89      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 1,791 1,367      
Allowance for Loan and Lease Losses Purchased Credit Impaired 1,791 1,456 1,023   1,383
Loan Balances Individually Evaluated for Impairment 539 701      
Loan Balances Collectively Evaluated for Impairment 123,814 113,187      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 1,432 2,127   3,432  
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 0 21      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 1,432 2,127      
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 488 250      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 3,421 2,315      
Allowance for Loan and Lease Losses Purchased Credit Impaired 3,909 2,565 2,315   1,268
Loan Balances Individually Evaluated for Impairment 4,358 4,235      
Loan Balances Collectively Evaluated for Impairment 318,182 241,057      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 556 1,012   1,882  
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 227 561      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 556 1,012      
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses Individually Evaluated for Impairment 5 5      
Allowance for Loan and Lease Losses Collectively Evaluated for Impairment 355 161      
Allowance for Loan and Lease Losses Purchased Credit Impaired 360 166 $ 101   $ 81
Loan Balances Individually Evaluated for Impairment 173 188      
Loan Balances Collectively Evaluated for Impairment 36,039 38,343      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 53 63   $ 178  
Consumer Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses Purchased Credit Impaired 0 0      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 53 $ 63