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Note 13 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Cash and cash equivalents $ 584,941 $ 317,945
Accrued interest receivable 13,749 13,094
Non-interest bearing 1,744,790 1,187,057
Time deposits 449,343 392,404
Accrued interest payable 398 391
Reported Value Measurement [Member]    
Cash and cash equivalents 584,941 317,945
Mortgage loans held for sale 10,201 22,547
Federal Home Loan Bank stock 9,376 11,284
Loans, net 4,132,584 3,479,676
Accrued interest receivable 13,749 13,094
Non-interest bearing 1,744,790 1,187,057
Transaction deposits 3,147,891 2,409,173
Time deposits 449,343 392,404
Securities sold under agreement to repurchase 74,406 47,979
Federal funds purchased 10,908 11,464
Federal Home Loan Bank advances 10,000 31,639
Accrued interest payable 398 391
Federal Home Loan Bank advances 10,000 31,639
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 584,941 317,945
Mortgage loans held for sale 10,490 23,389
Federal Home Loan Bank stock 9,376 11,284
Loans, net 4,158,330 3,513,916
Accrued interest receivable 13,749 13,094
Non-interest bearing 1,744,790 1,187,057
Transaction deposits 3,147,891 2,409,173
Time deposits 451,258 395,734
Securities sold under agreement to repurchase 74,406 47,979
Federal funds purchased 10,908 11,464
Federal Home Loan Bank advances 10,042 33,180
Accrued interest payable 398 391
Federal Home Loan Bank advances 10,042 33,180
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 584,941 317,945
Mortgage loans held for sale 0 0
Federal Home Loan Bank stock 0 0
Loans, net 0 0
Accrued interest receivable 13,749 13,094
Non-interest bearing 1,744,790 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 398 391
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 10,490 23,389
Federal Home Loan Bank stock 9,376 11,284
Loans, net 0 0
Accrued interest receivable 0 0
Non-interest bearing 0 0
Transaction deposits 3,147,891 2,409,173
Time deposits 451,258 395,734
Securities sold under agreement to repurchase 74,406 47,979
Federal funds purchased 10,908 11,464
Federal Home Loan Bank advances 10,042 33,180
Accrued interest payable 0 0
Federal Home Loan Bank advances 10,042 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 4,158,330 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