Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Mortgage servicing rights		$ 1,194
Reported Value Measurement [Member]
Cash and cash equivalents		95,572	$ 453,418
Loans, net		2,928,644	2,444,282
Mortgage servicing rights		1,016
Deposits		3,745,656	3,555,071
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	[1]	95,572	453,418
Loans, net	[1]	2,862,636	2,439,539
Mortgage servicing rights		1,194
Deposits	[1]	3,021,826	3,227,520
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		95,572	453,418
Loans, net		0	0
Mortgage servicing rights		0
Deposits		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		0	0
Loans, net		0	0
Mortgage servicing rights		1,194
Deposits		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		0	0
Loans, net		2,862,636	2,439,539
Mortgage servicing rights		0
Deposits		$ 3,021,826	$ 3,227,520

[1] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.