Note 3 - Debt and Equity Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) $ in Thousands	Jun. 30, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Available-for-Sale Securities, Less than 12 Months, Fair Value	$ 22,311	$ 254,434
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 900	$ 23,233
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	15	215
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 772,021	$ 567,812
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 136,289	$ 126,271
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	519	332
Available-for-Sale Securities, Total, Fair Value	$ 794,332	$ 822,246
Available-for-Sale Securities, Total, Unrealized Losses	137,189	149,504
US Treasury and Other US Government Agencies Debt Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 0
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	0	0
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 6,540	$ 6,497
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 830	$ 856
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	3	0
Available-for-Sale Securities, Total, Fair Value	$ 6,540	$ 6,497
Available-for-Sale Securities, Total, Unrealized Losses	830	856
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	9,747
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 872
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	0	4
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 149,358	$ 135,465
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 27,891	$ 31,177
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	58	54
Available-for-Sale Securities, Total, Fair Value	$ 149,358	$ 145,212
Available-for-Sale Securities, Total, Unrealized Losses	27,891	32,049
Collateralized Mortgage-Backed Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	604	148,441
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 12	$ 14,601
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	5	113
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 413,424	$ 295,431
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 71,127	$ 59,689
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	233	136
Available-for-Sale Securities, Total, Fair Value	$ 414,028	$ 443,872
Available-for-Sale Securities, Total, Unrealized Losses	71,139	74,290
Asset-Backed Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	13,653	35,276
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 757	$ 1,607
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	6	21
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 24,238	$ 9,974
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 1,435	$ 681
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	22	11
Available-for-Sale Securities, Total, Fair Value	$ 37,891	$ 45,250
Available-for-Sale Securities, Total, Unrealized Losses	2,192	2,288
Corporate Debt Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	0	2,403
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 0	$ 97
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included \| item	0	1
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 2,381	$ 0
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 119	$ 0
Available-for-Sale Securities, 12 Months or More, Number of Securities Included \| item	1	0
Available-for-Sale Securities, Total, Fair Value	$ 2,381	$ 2,403
Available-for-Sale Securities, Total, Unrealized Losses	119	97
US States and Political Subdivisions Debt Securities [Member]
Available-for-Sale Securities, Less than 12 Months, Fair Value	8,054	58,567
Available-for-Sale Securities, Less than 12 Months, Unrealized Losses	$ 131	$ 6,056
Available-for-Sale Securities, Less than 12 Months, Number of Securities Included	4	76
Available-for-Sale Securities, 12 Months or More, Fair Value	$ 176,080	$ 120,445
Available-for-Sale Securities, 12 Months or More, Unrealized Losses	$ 34,887	$ 33,868
Available-for-Sale Securities, 12 Months or More, Number of Securities Included	202	128
Available-for-Sale Securities, Total, Fair Value	$ 184,134	$ 179,012
Available-for-Sale Securities, Total, Unrealized Losses	$ 35,018	$ 39,924

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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