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Note 5 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Securities available-for-sale $ 736,944 $ 786,438  
Reported Value Measurement [Member]      
Securities available-for-sale 736,944   $ 786,438
Estimate of Fair Value Measurement [Member]      
Securities available-for-sale 736,944   786,438
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]      
Cash and cash equivalents 90,063   27,884
Interest-bearing time deposits 9,889   14,669
Accrued income receivable 13,794   11,275
Securities sold under agreements to repurchase 60,941   40,676
Accrued interest payable 3,561   666
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]      
Cash and cash equivalents 90,063   27,884
Interest-bearing time deposits 9,221   14,340
Accrued income receivable 13,794   11,275
Securities sold under agreements to repurchase 60,941   40,676
Accrued interest payable 3,561   666
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]      
FHLB and FRB stock 4,000   4,613
Loans receivable 1,231,893   1,226,011
Loans held for sale 428   154
Carrying amount 1,565   1,096
Deposits 1,828,681   1,897,957
Other borrowings 105,942   39,120
Derivative financial instruments 199   0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]      
FHLB and FRB stock 4,000   4,613
Loans receivable 1,173,464   1,170,948
Loans held for sale 428   154
Carrying amount 1,565   1,096
Deposits 1,828,256   1,895,473
Other borrowings 105,117   38,991
Derivative financial instruments $ 199   $ 0