Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,541,250	$ 1,473,348
Equity securities	27,011	22,158
Assets, fair value disclosure	1,618,856	1,540,447
Liabilities, fair value disclosure	42,456	52,806
Mutual Funds [Member]
Equity securities	1,047	5,509
Preferred Stock of Government Sponsored Entities [Member]
Equity securities	5,597	1,289
Other Equity Securities [Member]
Equity securities	20,367	15,360
Interest Rate Swap [Member]
Assets, fair value disclosure	49,620	44,443
Liabilities, fair value disclosure	42,027	51,864
Warrant [Member]
Assets, fair value disclosure		50
Foreign Exchange Contract [Member]
Assets, fair value disclosure	975	448
Liabilities, fair value disclosure	429	942
Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	269,698	240,500
Equity securities	27,011	22,158
Assets, fair value disclosure	296,709	262,658
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Equity securities	1,047	5,509
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member]
Equity securities	5,597	1,289
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]
Equity securities	20,367	15,360
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]
Assets, fair value disclosure		0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	1,271,552	1,232,848
Equity securities	0	0
Assets, fair value disclosure	1,322,147	1,277,739
Liabilities, fair value disclosure	42,456	52,806
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Assets, fair value disclosure	49,620	44,443
Liabilities, fair value disclosure	42,027	51,864
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]
Assets, fair value disclosure		0
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	975	448
Liabilities, fair value disclosure	429	942
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Equity securities	0	0
Assets, fair value disclosure	0	50
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] | Preferred Stock of Government Sponsored Entities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] | Other Equity Securities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]
Assets, fair value disclosure		50
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
US Treasury Securities [Member]
Securities available-for-sale	269,698	240,500
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	269,698	240,500
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	0	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
US Government Corporations and Agencies Securities [Member]
Securities available-for-sale	59,931	63,610
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	59,931	63,610
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	40,014	30,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	40,014	30,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale	857,302	867,094
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	857,302	867,094
Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Collateralized Mortgage Obligations [Member]
Securities available-for-sale	30,967	31,061
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	30,967	31,061
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Corporate Debt Securities [Member]
Securities available-for-sale	283,338	241,083
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	283,338	241,083
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0