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Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities available-for-sale $ 623,629 $ 534,507
Reported Value Measurement [Member]    
Cash and due from banks 333,844 265,536
Securities available-for-sale 623,629 534,507
Restricted investments in bank stocks 45,324 27,826
Equity securities 15,563 13,794
Net loans 7,808,733 6,749,849
Derivatives 54,041 3,347
Accrued interest receivable 38,940 34,152
Noninterest-bearing deposits 1,665,658 1,617,049
Interest-bearing deposits 5,644,852 4,715,904
Borrowings 829,953 468,193
Subordinated debentures 153,179 152,951
Accrued interest payable 5,733 2,716
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 333,844 265,536
Securities available-for-sale 623,629 534,507
Equity securities 15,563 13,794
Net loans 7,524,799 6,800,287
Derivatives 54,041 3,347
Accrued interest receivable 38,940 34,152
Noninterest-bearing deposits 1,665,658 1,617,049
Interest-bearing deposits 5,599,170 4,716,358
Borrowings 826,280 469,671
Subordinated debentures 153,170 163,995
Accrued interest payable 5,733 2,716
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 333,844 265,536
Securities available-for-sale 134 195
Equity securities 9,701 11,081
Net loans 0 0
Derivatives 0 0
Accrued interest receivable 0 0
Noninterest-bearing deposits 1,665,658 1,617,049
Interest-bearing deposits 3,723,617 3,565,795
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Securities available-for-sale 616,118 525,747
Equity securities 5,862 2,713
Net loans 0 0
Derivatives 54,041 3,347
Accrued interest receivable 3,219 1,554
Noninterest-bearing deposits 0 0
Interest-bearing deposits 1,875,553 1,150,563
Borrowings 826,280 469,671
Subordinated debentures 153,170 163,995
Accrued interest payable 5,733 2,716
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Securities available-for-sale 7,377 8,565
Equity securities 0 0
Net loans 7,524,799 6,800,287
Derivatives 0 0
Accrued interest receivable 35,721 32,598
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Subordinated debentures 0 0
Accrued interest payable $ 0 $ 0