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Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial assets:        
Investment securities available for sale, at fair value $ 464,430 $ 369,739    
Investment securities held to maturity, at fair value 463,799 425,183    
Fair Value of SBA Servicing Asset 5,243 5,352 $ 4,886 $ 4,099
Reported Value Measurement [Member]        
Financial assets:        
Cash and cash equivalents 61,942 34,554    
Investment securities available for sale, at fair value 464,430 369,739    
Investment securities held to maturity, at fair value 472,213 432,499    
Restricted stock 1,918 1,366    
Loans held for sale 45,700 28,065    
Loans receivable, net 1,153,679 955,817    
Fair Value of SBA Servicing Asset 5,243 5,352    
Accrued interest receivable 7,009 5,497    
Financial liabilities:        
Demand, savings and money market 1,946,558 1,566,506    
Time 116,737 111,164    
Subordinated debt 21,681 21,881    
Accrued interest payable 293 444    
Off-Balance Sheet Data        
Commitments to extend credit    
Standby letters-of-credit    
Reported Value Measurement [Member] | Interest Rate Lock Commitments [Member]        
Financial assets:        
Derivative asset 363 439    
Financial liabilities:        
Derivative liability 1 55    
Reported Value Measurement [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Financial assets:        
Derivative asset 5 103    
Financial liabilities:        
Derivative liability 93 125    
Reported Value Measurement [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Financial assets:        
Derivative asset 19 229    
Financial liabilities:        
Derivative liability 195 38    
Estimate of Fair Value Measurement [Member]        
Financial assets:        
Cash and cash equivalents 61,942 34,554    
Investment securities available for sale, at fair value 464,430 369,739    
Investment securities held to maturity, at fair value 463,799 425,183    
Restricted stock 1,918 1,366    
Loans held for sale 45,714 28,267    
Loans receivable, net 1,120,305 937,944    
Fair Value of SBA Servicing Asset 5,243 5,352    
Accrued interest receivable 7,009 5,497    
Financial liabilities:        
Demand, savings and money market 1,946,558 1,566,506    
Time 115,673 110,988    
Subordinated debt 18,458 16,286    
Accrued interest payable 293 444    
Off-Balance Sheet Data        
Commitments to extend credit    
Standby letters-of-credit    
Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]        
Financial assets:        
Derivative asset 363 439    
Financial liabilities:        
Derivative liability 1 55    
Estimate of Fair Value Measurement [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Financial assets:        
Derivative asset 5 103    
Financial liabilities:        
Derivative liability 93 125    
Estimate of Fair Value Measurement [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Financial assets:        
Derivative asset 19 229    
Financial liabilities:        
Derivative liability 195 38    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Financial assets:        
Cash and cash equivalents 61,942 34,554    
Investment securities available for sale, at fair value    
Investment securities held to maturity, at fair value    
Restricted stock    
Loans held for sale    
Loans receivable, net    
Fair Value of SBA Servicing Asset    
Accrued interest receivable      
Financial liabilities:        
Demand, savings and money market    
Time    
Subordinated debt    
Accrued interest payable      
Off-Balance Sheet Data        
Commitments to extend credit    
Standby letters-of-credit    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Lock Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
Financial assets:        
Cash and cash equivalents    
Investment securities available for sale, at fair value 460,855 364,948    
Investment securities held to maturity, at fair value 463,799 425,183    
Restricted stock 1,918 1,366    
Loans held for sale 43,375 23,911    
Loans receivable, net    
Fair Value of SBA Servicing Asset    
Accrued interest receivable 7,009 5,497    
Financial liabilities:        
Demand, savings and money market 1,946,558 1,566,506    
Time 115,673 110,988    
Subordinated debt    
Accrued interest payable 293 444    
Off-Balance Sheet Data        
Commitments to extend credit    
Standby letters-of-credit    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Lock Commitments [Member]        
Financial assets:        
Derivative asset 363 439    
Financial liabilities:        
Derivative liability 1 55    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Financial assets:        
Derivative asset 5 103    
Financial liabilities:        
Derivative liability 93 125    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Financial assets:        
Derivative asset 19 229    
Financial liabilities:        
Derivative liability 195 38    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]        
Financial assets:        
Cash and cash equivalents    
Investment securities available for sale, at fair value 3,575 4,791    
Investment securities held to maturity, at fair value    
Restricted stock    
Loans held for sale 2,339 4,356    
Loans receivable, net 1,120,305 937,944    
Fair Value of SBA Servicing Asset 5,243 5,352    
Accrued interest receivable      
Financial liabilities:        
Demand, savings and money market    
Time    
Subordinated debt 18,458 16,286    
Accrued interest payable      
Off-Balance Sheet Data        
Commitments to extend credit    
Standby letters-of-credit    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Lock Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Financial assets:        
Derivative asset    
Financial liabilities:        
Derivative liability