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Note 8 - Deposits - Total Deposits and the Weighted Average Rate on Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Interest-bearing deposits:    
Certificate of deposit accounts $ 1,351,933 $ 1,372,115
Certificate of deposit accounts 1.57%  
Savings accounts $ 290,280 254,283
Savings accounts 0.64%  
Money market accounts $ 979,958 843,370
Money market accounts 1.05%  
NOW accounts $ 1,333,232 1,362,484
NOW accounts 0.83%  
Total interest-bearing deposits $ 3,955,403 3,832,252
Non-interest bearing demand deposits 385,269 333,163
Total due to depositors 4,340,672 4,165,415
Mortgagors' escrow deposits $ 42,606 40,216
Mortgagors' escrow deposits 0.25%  
Deposits $ 4,383,278 $ 4,205,631