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Note 12 - Fair Value - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Securities available for sale $ 158,685 $ 165,579    
Securities held to maturity, Fair Value 47,196 47,266    
FDIC indemnification asset 9,931 12,173 $ 18,787 $ 20,844
Interest receivable 5,059 5,553    
Derivative Liabilities 142 167    
Reported Value Measurement [Member]        
Cash and cash equivalents 152,851 76,307    
Securities available for sale 158,685 165,579    
Securities held to maturity, Fair Value 47,092 47,133    
Fair value loans 1,817,325 1,835,000    
FDIC indemnification asset 9,931 12,173    
Interest receivable 5,059 5,553    
Deferred compensation assets 3,345 3,224    
Securities sold under agreements to repurchase 90,653 98,005    
Interest payable 1,131 1,280    
FHLB and other borrowings 65,244 80,708    
Derivative Liabilities 142 167    
Deferred compensation liabilities 3,345 3,224    
Reported Value Measurement [Member] | Demand Deposits [Member]        
Deposits fair value 467,677 427,705    
Reported Value Measurement [Member] | Interest-bearing Deposits [Member]        
Deposits fair value 392,905 378,339    
Reported Value Measurement [Member] | Savings Deposits [Member]        
Deposits fair value 529,155 523,260    
Reported Value Measurement [Member] | Bank Time Deposits [Member]        
Deposits fair value 516,857 512,034    
Estimate of Fair Value Measurement [Member]        
Cash and cash equivalents 152,851 76,307    
Securities available for sale 158,685 165,579    
Securities held to maturity, Fair Value 47,196 47,266    
Fair value loans 1,790,086 1,805,999    
FDIC indemnification asset 6,692 8,112    
Interest receivable 5,059 5,553    
Deferred compensation assets 3,345 3,224    
Securities sold under agreements to repurchase 91,380 98,879    
Interest payable 1,131 1,280    
FHLB and other borrowings 69,102 83,551    
Derivative Liabilities 142 167    
Deferred compensation liabilities 3,345 3,224    
Estimate of Fair Value Measurement [Member] | Demand Deposits [Member]        
Deposits fair value 467,677 427,705    
Estimate of Fair Value Measurement [Member] | Interest-bearing Deposits [Member]        
Deposits fair value 392,905 378,339    
Estimate of Fair Value Measurement [Member] | Savings Deposits [Member]        
Deposits fair value 529,155 523,260    
Estimate of Fair Value Measurement [Member] | Bank Time Deposits [Member]        
Deposits fair value 512,679 507,917    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Cash and cash equivalents 152,851 76,307    
Securities available for sale 55 55    
Securities held to maturity, Fair Value    
Fair value loans    
FDIC indemnification asset    
Interest receivable    
Deferred compensation assets 3,345 3,224    
Securities sold under agreements to repurchase    
Interest payable    
FHLB and other borrowings    
Derivative Liabilities    
Deferred compensation liabilities 3,345 3,224    
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] | 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 1 [Member] | Bank Time Deposits [Member]        
Deposits fair value    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
Cash and cash equivalents    
Securities available for sale 158,630 165,524    
Securities held to maturity, Fair Value 47,196 47,266    
Fair value loans 4,628 4,701    
FDIC indemnification asset    
Interest receivable 5,059 5,553    
Deferred compensation assets    
Securities sold under agreements to repurchase 91,380 98,879    
Interest payable 1,131 1,280    
FHLB and other borrowings 69,102 83,551    
Derivative Liabilities 142 167    
Deferred compensation liabilities    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Demand Deposits [Member]        
Deposits fair value 467,677 427,705    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]        
Deposits fair value 392,905 378,339    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Savings Deposits [Member]        
Deposits fair value 529,155 523,260    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member]        
Deposits fair value 512,679 507,917    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]        
Cash and cash equivalents    
Securities available for sale    
Securities held to maturity, Fair Value    
Fair value loans 1,785,458 1,801,298    
FDIC indemnification asset 6,692 8,112    
Interest receivable    
Deferred compensation assets    
Securities sold under agreements to repurchase    
Interest payable    
FHLB and other borrowings    
Derivative Liabilities    
Deferred compensation 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] | 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    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Time Deposits [Member]        
Deposits fair value