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Note 11 - Assets and Liabilities Measured and Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Cash and cash equivalents $ 254,511 $ 249,724
Accrued interest receivable 8,563 8,534
Non-interest bearing 858,883 810,475
Time deposits 422,986 432,217
Accrued interest payable 419 640
Reported Value Measurement [Member]    
Cash and cash equivalents 254,511 249,724
Mortgage loans held for sale 8,141 8,748
Federal Home Loan Bank stock 11,284 11,284
Loans, net 2,895,223 2,818,225
Accrued interest receivable 8,563 8,534
Non-interest bearing 858,883 810,475
Transaction deposits 1,917,009 1,891,246
Time deposits 422,986 432,217
Securities sold under agreement to repurchase 32,366 31,895
Federal funds purchased 9,747 10,887
FHLB advances 69,191 79,953
Accrued interest payable 419 640
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 254,511 249,724
Mortgage loans held for sale 8,353 8,923
Federal Home Loan Bank stock 11,284 11,284
Loans, net 2,929,957 2,841,767
Accrued interest receivable 8,563 8,534
Non-interest bearing 858,883 810,475
Transaction deposits 1,917,009 1,891,246
Time deposits 429,930 434,927
Securities sold under agreement to repurchase 32,366 31,895
Federal funds purchased 9,747 10,887
FHLB advances 71,362 80,906
Accrued interest payable 419 640
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 254,511 249,724
Mortgage loans held for sale 0 0
Federal Home Loan Bank stock 0 0
Loans, net 0 0
Accrued interest receivable 8,563 8,534
Non-interest bearing 858,883 810,475
Transaction deposits 0 0
Time deposits 0 0
Securities sold under agreement to repurchase 0 0
Federal funds purchased 0 0
FHLB advances 0 0
Accrued interest payable 419 640
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Mortgage loans held for sale 8,353 8,923
Federal Home Loan Bank stock 11,284 11,284
Loans, net 0 0
Accrued interest receivable 0 0
Non-interest bearing 0 0
Transaction deposits 1,917,009 1,891,246
Time deposits 429,930 434,927
Securities sold under agreement to repurchase 32,366 31,895
Federal funds purchased 9,747 10,887
FHLB advances 71,362 80,906
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Mortgage loans held for sale 0 0
Federal Home Loan Bank stock 0 0
Loans, net 2,929,957 2,841,767
Accrued interest receivable 0 0
Non-interest bearing 0 0
Transaction deposits 0 0
Time deposits 0 0
Securities sold under agreement to repurchase 0 0
Federal funds purchased 0 0
FHLB advances 0 0
Accrued interest payable $ 0 $ 0