Deposits - Total Deposits and the Weighted Average Rate on Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Note 9 - Deposits - Total Deposits and the Weighted Average Rate on Deposits (Details)
Certificate of deposit accounts	$ 946,575	$ 1,138,361
Certificate of deposit accounts	0.57%
Savings accounts	$ 156,554	168,183
Savings accounts	0.13%
Money market accounts	$ 2,342,003	1,682,345
Money market accounts	0.22%
NOW accounts	$ 1,920,779	2,323,172
NOW accounts	0.11%
Total interest-bearing deposits	$ 5,365,911	5,312,061
Non-interest bearing demand deposits	967,621	778,672
Total due to depositors	6,333,532	6,090,733
Mortgagors' escrow deposits	$ 51,913	45,622
Mortgagors' escrow deposits	0.01%
Deposits, Total	$ 6,385,445	$ 6,136,355