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Deposits - Total Deposits and the Weighted Average Rate on Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Note 8 - Deposits - Total Deposits and the Weighted Average Rate on Deposits (Details)    
Certificate of deposit accounts $ 1,437,890 $ 1,563,310
Certificate of deposit accounts 2.22%  
Savings accounts $ 191,485 210,022
Savings accounts 0.67%  
Money market accounts $ 1,592,011 1,427,992
Money market accounts 1.87%  
NOW accounts $ 1,365,591 1,300,852
NOW accounts 1.47%  
Total interest-bearing deposits $ 4,586,977 4,502,176
Non-interest bearing demand deposits 435,072 413,747
Total due to depositors 5,022,049 4,915,923
Mortgagors' escrow deposits 44,375 44,861
Deposits, Total $ 5,066,424 $ 4,960,784