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Note 8 - Deposits (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Deposits and Weighted Average Rate on Deposits [Table Text Block]
    2018   2017   Weighted
Average
Rate
2018
    (Dollars in thousands)
Interest-bearing deposits:                        
Certificate of deposit accounts   $
1,563,310
    $
1,351,933
     
2.10
%
Savings accounts    
210,022
     
290,280
     
0.72
 
Money market accounts    
1,427,992
     
979,958
     
1.93
 
NOW accounts    
1,300,852
     
1,333,232
     
1.53
 
Total interest-bearing deposits    
4,502,176
     
3,955,403
     
 
 
Non-interest bearing demand deposits    
413,747
     
385,269
     
 
 
Total due to depositors    
4,915,923
     
4,340,672
     
 
 
Mortgagors' escrow deposits    
44,861
     
42,606
     
 
 
Total deposits   $
4,960,784
    $
4,383,278
     
 
 
Schedule of Interest Expense on Deposits [Table Text Block]
    2018   2017   2016
    (In thousands)
Certificate of deposit accounts   $
28,310
    $
20,579
    $
20,536
 
Savings accounts    
1,370
     
1,808
     
1,219
 
Money market accounts    
18,707
     
8,151
     
3,592
 
NOW accounts    
15,896
     
9,640
     
7,891
 
Total due to depositors    
64,283
     
40,178
     
33,238
 
Mortgagors' escrow deposits    
214
     
141
     
112
 
Total interest expense on deposits   $
64,497
    $
40,319
    $
33,350
 
Schedule of Remaining Maturities of Certificates of Deposit Accounts [Table Text Block]
    2018   2017
    (In thousands)
Within 12 months   $
1,017,177
    $
759,360
 
More than 12 months to 24 months    
404,930
     
449,293
 
More than 24 months to 36 months    
78,427
     
95,626
 
More than 36 months to 48 months    
10,915
     
42,928
 
More than 48 months to 60 months    
51,365
     
2,648
 
More than 60 months    
496
     
2,078
 
Total certificate of deposit accounts   $
1,563,310
    $
1,351,933