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	Jun. 30, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,487,321	$ 1,473,348
Equity securities	37,674	22,158
Assets, fair value disclosure	1,607,402	1,540,447
Liabilities, fair value disclosure	50,649	52,806
Mutual Funds [Member]
Equity securities	5,509	5,509
Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,391	1,289
Other Equity Securities [Member]
Equity securities	30,774	15,360
Warrant [Member]
Assets, fair value disclosure		50
Interest Rate Swap [Member]
Assets, fair value disclosure	81,759	44,443
Liabilities, fair value disclosure	50,017	51,864
Foreign Exchange Contract [Member]
Assets, fair value disclosure	648	448
Liabilities, fair value disclosure	632	942
Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	272,038	240,500
Equity securities	37,674	22,158
Assets, fair value disclosure	309,712	262,658
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Equity securities	5,509	5,509
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,391	1,289
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]
Equity securities	30,774	15,360
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]
Assets, fair value disclosure		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	1,215,283	1,232,848
Equity securities	0	0
Assets, fair value disclosure	1,297,690	1,277,739
Liabilities, fair value disclosure	50,649	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
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Assets, fair value disclosure	81,759	44,443
Liabilities, fair value disclosure	50,017	51,864
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Assets, fair value disclosure	648	448
Liabilities, fair value disclosure	632	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] | Warrant [Member]
Assets, fair value disclosure		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	272,038	240,500
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	272,038	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	55,543	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	55,543	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	33,614	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	33,614	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	822,244	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	822,244	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	29,503	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	29,503	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	251,928	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	251,928	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	22,451
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	22,451
Debt Security, Corporate, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0