Note 4 - Loans Leases Receivable - Concentration by Industries (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Gross	$ 4,680,132	$ 4,251,129
Lessors of Non-residential Buildings [Member]
Loans and Leases Receivable, Gross	$ 586,672	$ 591,398
Percentage of total loans/leases	13.00%	14.00%
Lessors of Residential Buildings [Member]
Loans and Leases Receivable, Gross	$ 1,706,092	$ 1,134,178
Percentage of total loans/leases	36.00%	27.00%
Administration of Urban Planning and Community and Rural Development [Member]
Loans and Leases Receivable, Gross	$ 120,416	$ 138,514
Percentage of total loans/leases	3.00%	3.00%