v3.26.1
Note 14 - Disclosure of Financial Instruments Not Reported at Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Cash and cash equivalents $ 666,719 $ 886,376
Accrued interest receivable 28,579 28,783
Non-interest bearing 1,456,324 1,435,846
Time deposits 1,743,513 1,736,534
Accrued interest payable 1,706 1,740
Reported Value Measurement [Member]    
Cash and cash equivalents 666,719 886,376
HTM debt securities 192,956 198,946
Federal Home Loan Bank stock 20,717 20,717
Loans, net 7,132,833 6,949,443
Accrued interest receivable 28,579 28,783
Mortgage servicing rights 9,776 10,189
Non-interest bearing 1,456,324 1,435,846
Transaction deposits 4,557,399 4,618,757
Time deposits 1,743,513 1,736,534
Securities sold under agreement to repurchase 87,513 112,476
Federal funds purchased 7,345 7,289
Subordinated debentures 26,806 26,806
FHLB advances 300,000 300,000
Accrued interest payable 1,706 1,740
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 666,719 886,376
HTM debt securities 175,255 181,203
Federal Home Loan Bank stock 20,717 20,717
Loans, net 7,052,710 6,872,537
Accrued interest receivable 28,579 28,783
Mortgage servicing rights 23,053 22,237
Non-interest bearing 1,456,324 1,435,846
Transaction deposits 4,557,399 4,618,757
Time deposits 1,743,609 1,740,161
Securities sold under agreement to repurchase 87,513 112,476
Federal funds purchased 7,345 7,289
Subordinated debentures 26,438 26,547
FHLB advances 295,886 297,101
Accrued interest payable 1,706 1,740
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 666,719 886,376
HTM debt securities 1,996 1,982
Federal Home Loan Bank stock 0 0
Loans, net 0 0
Accrued interest receivable 0 0
Mortgage servicing rights 0 0
Non-interest bearing 1,456,324 1,435,846
Transaction deposits 0 0
Time deposits 0 0
Securities sold under agreement to repurchase 0 0
Federal funds purchased 0 0
Subordinated debentures 0 0
FHLB advances 0 0
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
HTM debt securities 173,259 179,221
Federal Home Loan Bank stock 20,717 20,717
Loans, net 0 0
Accrued interest receivable 28,579 28,783
Mortgage servicing rights 0 0
Non-interest bearing 0 0
Transaction deposits 4,557,399 4,618,757
Time deposits 1,743,609 1,740,161
Securities sold under agreement to repurchase 87,513 112,476
Federal funds purchased 7,345 7,289
Subordinated debentures 26,438 26,547
FHLB advances 295,886 297,101
Accrued interest payable 1,706 1,740
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
HTM debt securities 0 0
Federal Home Loan Bank stock 0 0
Loans, net 7,052,710 6,872,537
Accrued interest receivable 0 0
Mortgage servicing rights 23,053 22,237
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
Subordinated debentures 0 0
FHLB advances 0 0
Accrued interest payable $ 0 $ 0