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Note 12 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Cash and cash equivalents $ 332,981 $ 317,945
Accrued interest receivable 12,998 13,094
Non-interest bearing 1,370,183 1,187,057
Time deposits 367,707 392,404
Accrued interest payable 249 391
Reported Value Measurement [Member]    
Cash and cash equivalents 332,981 317,945
Mortgage loans held for sale 6,579 22,547
Federal Home Loan Bank stock 10,228 11,284
Loans, net 3,584,442 3,479,676
Accrued interest receivable 12,998 13,094
Non-interest bearing 1,370,183 1,187,057
Transaction deposits 2,462,072 2,409,173
Time deposits 367,707 392,404
Securities sold under agreement to repurchase 51,681 47,979
Federal funds purchased 8,642 11,464
Federal Home Loan Bank advances 24,180 31,639
Accrued interest payable 249 391
Federal Home Loan Bank advances 24,180 31,639
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 332,981 317,945
Mortgage loans held for sale 6,726 23,389
Federal Home Loan Bank stock 10,228 11,284
Loans, net 3,618,075 3,513,916
Accrued interest receivable 12,998 13,094
Non-interest bearing 1,370,183 1,187,057
Transaction deposits 2,462,072 2,409,173
Time deposits 370,126 395,734
Securities sold under agreement to repurchase 51,681 47,979
Federal funds purchased 8,642 11,464
Federal Home Loan Bank advances 24,792 33,180
Accrued interest payable 249 391
Federal Home Loan Bank advances 24,792 33,180
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 332,981 317,945
Mortgage loans held for sale 0 0
Federal Home Loan Bank stock 0 0
Loans, net 0 0
Accrued interest receivable 12,998 13,094
Non-interest bearing 1,370,183 1,187,057
Transaction deposits 0 0
Time deposits 0 0
Securities sold under agreement to repurchase 0 0
Federal funds purchased 0 0
Federal Home Loan Bank advances 0 0
Accrued interest payable 249 391
Federal Home Loan Bank advances 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Mortgage loans held for sale 6,726 23,389
Federal Home Loan Bank stock 10,228 11,284
Loans, net 0 0
Accrued interest receivable 0 0
Non-interest bearing 0 0
Transaction deposits 2,462,072 2,409,173
Time deposits 370,126 395,734
Securities sold under agreement to repurchase 51,681 47,979
Federal funds purchased 8,642 11,464
Federal Home Loan Bank advances 24,792 33,180
Accrued interest payable 0 0
Federal Home Loan Bank advances 24,792 33,180
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 3,618,075 3,513,916
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
Federal Home Loan Bank advances 0 0
Accrued interest payable 0 0
Federal Home Loan Bank advances $ 0 $ 0