Deposits - Interest Expense on Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Note 9 - Deposits - Interest Expense on Deposits (Details)
Certificate of deposit accounts	$ 18,096	$ 35,078	$ 28,310
Savings accounts	495	1,378	1,370
Money market accounts	14,368	27,819	18,707
NOW accounts	9,309	23,553	15,896
Total due to depositors	42,268	87,828	64,283
Mortgagors' escrow deposits	44	229	214
Total interest expense on deposits	$ 42,312	$ 88,057	$ 64,497