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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment securities available for sale, at fair value $ 321,014 $ 464,430    
Investment securities held to maturity, at fair value 747,323 463,799    
Fair Value of SBA Servicing Asset 4,785 5,243 $ 5,352 $ 4,886
Reported Value Measurement [Member]        
Cash and cash equivalents 72,473 61,942    
Investment securities available for sale, at fair value 321,014 464,430    
Investment securities held to maturity, at fair value 761,563 472,213    
Restricted stock 5,754 1,918    
Loans held for sale 26,291 45,700    
Loans receivable, net 1,427,983 1,153,679    
Fair Value of SBA Servicing Asset 4,785 5,243    
Accrued interest receivable 9,025 7,009    
Demand, savings and money market 2,238,610 1,946,558    
Time 154,257 116,737    
Subordinated debt 11,259 21,681    
Accrued interest payable 558 293    
Commitments to extend credit    
Standby letters-of-credit    
Reported Value Measurement [Member] | Interest Rate Lock Commitments [Member]        
Derivative asset 410 363    
Derivative liability 1    
Reported Value Measurement [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Derivative asset 5 5    
Derivative liability 138 93    
Reported Value Measurement [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Derivative asset 10 19    
Derivative liability 230 195    
Estimate of Fair Value Measurement [Member]        
Cash and cash equivalents 72,473 61,942    
Investment securities available for sale, at fair value 321,014 464,430    
Investment securities held to maturity, at fair value 747,323 463,799    
Restricted stock 5,754 1,918    
Loans held for sale 26,291 45,714    
Loans receivable, net 1,410,945 1,120,305    
Fair Value of SBA Servicing Asset 4,785 5,243    
Accrued interest receivable 9,025 7,009    
Demand, savings and money market 2,238,610 1,946,558    
Time 152,989 115,673    
Subordinated debt 8,279 18,458    
Accrued interest payable 558 293    
Commitments to extend credit    
Standby letters-of-credit    
Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]        
Derivative asset 410 363    
Derivative liability 1    
Estimate of Fair Value Measurement [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Derivative asset 5 5    
Derivative liability 138 93    
Estimate of Fair Value Measurement [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Derivative asset 10 19    
Derivative liability 230 195    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Cash and cash equivalents 72,473 61,942    
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      
Demand, savings and money market    
Time    
Subordinated debt    
Accrued interest payable      
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]        
Derivative asset    
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Derivative asset    
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Derivative asset    
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
Cash and cash equivalents    
Investment securities available for sale, at fair value 317,945 460,855    
Investment securities held to maturity, at fair value 747,323 463,799    
Restricted stock 5,754 1,918    
Loans held for sale 20,887 43,375    
Loans receivable, net    
Fair Value of SBA Servicing Asset    
Accrued interest receivable 9,025 7,009    
Demand, savings and money market 2,238,610 1,946,558    
Time 152,989 115,673    
Subordinated debt    
Accrued interest payable 558 293    
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]        
Derivative asset 410 363    
Derivative liability 1    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Derivative asset 5 5    
Derivative liability 138 93    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Derivative asset 10 19    
Derivative liability 230 195    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]        
Cash and cash equivalents    
Investment securities available for sale, at fair value 3,069 3,575    
Investment securities held to maturity, at fair value    
Restricted stock    
Loans held for sale 5,404 2,339    
Loans receivable, net 1,410,945 1,120,305    
Fair Value of SBA Servicing Asset 4,785 5,243    
Accrued interest receivable      
Demand, savings and money market    
Time    
Subordinated debt 8,279 18,458    
Accrued interest payable      
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]        
Derivative asset    
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Best Efforts Forward Loan sales Commitments [Member]        
Derivative asset    
Derivative liability    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Mandatory Forward Loan Sales Commitments [Member]        
Derivative asset    
Derivative liability