Note 3 - Debt and Equity Securities - Debt and Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale, amortized cost	$ 1,025,584	$ 906,135
Securities, Available-for-sale, Gross Unrealized Gains	125	5,645
Securities, Available-for-sale, Gross Unrealized Losses	109,602	14,195
Debt Securities, Available-for-Sale, Total	916,107	897,585
US Treasury and Other US Government Agencies Debt Securities [Member]
Available-for-sale, amortized cost	26,963	7,320
Securities, Available-for-sale, Gross Unrealized Gains	0	0
Securities, Available-for-sale, Gross Unrealized Losses	797	99
Debt Securities, Available-for-Sale, Total	26,166	7,221
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale, amortized cost	180,271	163,700
Securities, Available-for-sale, Gross Unrealized Gains	0	20
Securities, Available-for-sale, Gross Unrealized Losses	22,191	4,490
Debt Securities, Available-for-Sale, Total	158,080	159,230
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale, amortized cost	545,610	465,588
Securities, Available-for-sale, Gross Unrealized Gains	14	2,726
Securities, Available-for-sale, Gross Unrealized Losses	53,551	6,537
Debt Securities, Available-for-Sale, Total	492,073	461,777
Asset-Backed Securities [Member]
Available-for-sale, amortized cost	43,245	46,583
Securities, Available-for-sale, Gross Unrealized Gains	111	213
Securities, Available-for-sale, Gross Unrealized Losses	1,381	83
Debt Securities, Available-for-Sale, Total	41,975	46,713
Corporate Debt Securities [Member]
Available-for-sale, amortized cost	2,500	2,500
Securities, Available-for-sale, Gross Unrealized Gains	0	75
Securities, Available-for-sale, Gross Unrealized Losses	49	0
Debt Securities, Available-for-Sale, Total	2,451	2,575
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	226,995	220,444
Securities, Available-for-sale, Gross Unrealized Gains	0	2,611
Securities, Available-for-sale, Gross Unrealized Losses	31,633	2,986
Debt Securities, Available-for-Sale, Total	$ 195,362	$ 220,069

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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