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Note 13 - Fair Value - Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Debt securities available for sale $ 164,137 $ 165,525 [1]    
Securities held to maturity, fair value 24,987 25,084    
FDIC indemnification asset 6,884 7,161 [1] $ 9,931 $ 12,173
Interest receivable 5,155 5,778 [1]    
Derivative financial assets 45    
Derivative financial liabilities 90    
Reported Value Measurement [Member]        
Cash and cash equivalents 205,140 157,951    
Debt securities available for sale 164,137 165,525    
Securities held to maturity, fair value 25,115 25,149    
Equity securities 55 55    
Loans held for investment, net of allowance 1,773,609 1,797,908    
FDIC indemnification asset 6,884 7,161    
Interest receivable 5,155 5,778    
Derivative financial assets 45      
Deferred compensation assets 4,070 4,002    
Securities sold under agreements to repurchase 29,115 30,086    
Interest payable 1,072 1,104    
FHLB and other borrowings 50,000 50,000    
Deferred compensation liabilities 4,070 4,002    
Derivative financial liabilities   90    
Reported Value Measurement [Member] | Demand Deposits [Member]        
Deposits fair value   454,143    
Reported Value Measurement [Member] | Bank Time Deposits [Member]        
Deposits fair value 485,648 497,546    
Reported Value Measurement [Member] | Interest-bearing Deposits [Member]        
Deposits fair value   465,407    
Reported Value Measurement [Member] | Savings Deposits [Member]        
Deposits fair value   512,795    
Estimate of Fair Value Measurement [Member]        
Cash and cash equivalents 205,140 157,951    
Debt securities available for sale 164,137 165,525    
Securities held to maturity, fair value 24,987 25,084    
Equity securities 55 55    
Loans held for investment, net of allowance 1,758,212 1,760,606    
FDIC indemnification asset 3,630 3,927    
Interest receivable 5,155 5,778    
Derivative financial assets 45      
Deferred compensation assets 4,070 4,002    
Securities sold under agreements to repurchase 29,300 30,449    
Interest payable 1,072 1,104    
FHLB and other borrowings 51,845 52,702    
Deferred compensation liabilities 4,070 4,002    
Derivative financial liabilities   90    
Estimate of Fair Value Measurement [Member] | Demand Deposits [Member]        
Deposits fair value   454,143    
Estimate of Fair Value Measurement [Member] | Bank Time Deposits [Member]        
Deposits fair value 475,605 490,628    
Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]        
Deposits fair value   465,407    
Estimate of Fair Value Measurement [Member] | Savings Deposits [Member]        
Deposits fair value   512,795    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Cash and cash equivalents 205,140 157,951    
Debt securities available for sale    
Securities held to maturity, fair value    
Equity securities 55 55    
Loans held for investment, net of allowance    
FDIC indemnification asset    
Interest receivable    
Derivative financial assets      
Deferred compensation assets 4,070 4,002    
Securities sold under agreements to repurchase    
Interest payable    
FHLB and other borrowings    
Deferred compensation liabilities 4,070 4,002    
Derivative financial liabilities      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Demand Deposits [Member]        
Deposits fair value      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member]        
Deposits fair value    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest-bearing Deposits [Member]        
Deposits fair value      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Savings Deposits [Member]        
Deposits fair value      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
Cash and cash equivalents    
Debt securities available for sale 164,137 165,525    
Securities held to maturity, fair value 24,987 25,084    
Equity securities    
Loans held for investment, net of allowance 5,739    
FDIC indemnification asset    
Interest receivable 5,155 5,778    
Derivative financial assets 45      
Deferred compensation assets    
Securities sold under agreements to repurchase 29,300 30,449    
Interest payable 1,072 1,104    
FHLB and other borrowings 51,845 52,702    
Deferred compensation liabilities    
Derivative financial liabilities   90    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Demand Deposits [Member]        
Deposits fair value   454,143    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member]        
Deposits fair value 475,605 490,628    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]        
Deposits fair value   465,407    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Savings Deposits [Member]        
Deposits fair value   512,795    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]        
Cash and cash equivalents    
Debt securities available for sale    
Securities held to maturity, fair value    
Equity securities    
Loans held for investment, net of allowance 1,758,212 1,754,867    
FDIC indemnification asset 3,630 3,927    
Interest receivable    
Derivative financial assets      
Deferred compensation assets    
Securities sold under agreements to repurchase    
Interest payable    
FHLB and other borrowings    
Deferred compensation liabilities    
Derivative financial liabilities      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Demand Deposits [Member]        
Deposits fair value      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Time Deposits [Member]        
Deposits fair value    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest-bearing Deposits [Member]        
Deposits fair value      
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Savings Deposits [Member]        
Deposits fair value      
[1] Derived from audited financial statements