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	Sep. 30, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,508,798	$ 1,473,348
Equity securities	31,456	22,158
Assets, fair value disclosure	1,624,588	1,540,447
Liabilities, fair value disclosure	56,997	52,806
Mutual Funds [Member]
Equity securities	5,337	5,509
Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,378	1,289
Other Equity Securities [Member]
Equity securities	24,741	15,360
Warrant [Member]
Assets, fair value disclosure	42	50
Interest Rate Swap [Member]
Assets, fair value disclosure	83,434	44,443
Liabilities, fair value disclosure	56,058	51,864
Foreign Exchange Contract [Member]
Assets, fair value disclosure	858	448
Liabilities, fair value disclosure	939	942
Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	392,842	240,500
Equity securities	31,456	22,158
Assets, fair value disclosure	424,298	262,658
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Equity securities	5,337	5,509
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,378	1,289
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]
Equity securities	24,741	15,360
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]
Assets, fair value disclosure	0	0
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] | 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	1,115,956	1,232,848
Equity securities	0	0
Assets, fair value disclosure	1,200,248	1,277,739
Liabilities, fair value disclosure	56,997	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] | Warrant [Member]
Assets, fair value disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Assets, fair value disclosure	83,434	44,443
Liabilities, fair value disclosure	56,058	51,864
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	858	448
Liabilities, fair value disclosure	939	942
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Equity securities	0	0
Assets, fair value disclosure	42	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] | Warrant [Member]
Assets, fair value disclosure	42	50
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] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
US Treasury Securities [Member]
Securities available-for-sale	392,842	240,500
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	392,842	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	51,001	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	51,001	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	33,620	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	33,620	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	761,803	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	761,803	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	27,698	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	27,698	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	231,872	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	231,872	241,083
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	$ 0
Debt Security, Corporate, Non-US [Member]
Securities available-for-sale	9,962
Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0
Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	9,962
Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0