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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Investment Securities
   
September 30, 2020
   
   Amortized   

Cost
 
Gross

   Unrealized   

Holding

Gain
 
 
Gross
   Unrealized   

Holding

Loss
 
   Fair Value   
 
  Total Percent  
   
(Dollars in thousands)
Investment securities
available-for-sale:
         
Mortgage-backed securities
    $ 1,710,160       $ 46,713       $ (2)       $ 1,756,871       79.65%  
CMO/REMIC
    404,380       7,326       (212)       411,494       18.66%  
Municipal bonds
    35,011       1,457       -       36,468       1.65%  
Other securities
    813       -       -       813       0.04%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
available-for-sale
securities
    $ 2,150,364       $ 55,496       $ (214)       $ 2,205,646       100.00%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investment securities
held-to-maturity:
         
Government agency/GSE
    $ 103,317       $ 6,627       $ -       $ 109,944       17.88%  
Mortgage-backed securities
    152,285       7,837       -       160,122       26.36%  
CMO/REMIC
    159,676       5,315       -       164,991       27.64%  
Municipal bonds
    162,416       6,387       (338)       168,465       28.12%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
held-to-maturity
securities
    $ 577,694       $ 26,166       $ (338)       $ 603,522       100.00%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
December 31, 2019
   
   Amortized   

Cost
 
Gross

   Unrealized   

Holding

Gain
 
 
Gross
   Unrealized   

Holding

Loss
 
   Fair Value   
 
  Total Percent  
   
(Dollars in thousands)
Investment securities
available-for-sale:
         
Mortgage-backed securities
    $ 1,185,757       $ 21,306       $ (750)       $ 1,206,313       69.32%  
CMO/REMIC
    493,214       1,392       (896)       493,710       28.37%  
Municipal bonds
    38,506       850       (2)       39,354       2.26%  
Other securities
    880       -       -       880       0.05%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
available-for-sale
securities
    $ 1,718,357       $ 23,548       $ (1,648)       $ 1,740,257       100.00%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investment securities
held-to-maturity:
         
Government agency/GSE
    $ 117,366       $ 2,280       $ (657)       $ 118,989       17.40%  
Mortgage-backed securities
    168,479       2,083       (54)       170,508       24.98%  
CMO/REMIC
    192,548       -       (2,458)       190,090       28.55%  
Municipal bonds
    196,059       3,867       (565)       199,361       29.07%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
held-to-maturity
securities
    $ 674,452       $ 8,230       $ (3,734)       $ 678,948       100.00%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Summary of Interest Income Earned on Investment Securities
The following table provides information about the amount of interest income earned on investment securities which is fully taxable and which is exempt from regular federal income tax.
 
    
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
    
     2020     
  
     2019     
  
     2020     
  
     2019     
    
(Dollars in thousands)
Investment securities
available-for-sale:
           
Taxable
     $ 8,244        $ 8,949        $ 26,313        $ 29,079  
Tax-advantaged
     203        273        632        906  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total interest income from
available-for-sale
securities
     8,447        9,222        26,945        29,985  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Investment securities
held-to-maturity:
           
Taxable
     2,265        2,883        7,410        8,725  
Tax-advantaged
     1,110        1,415        3,623        4,524  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total interest income from
held-to-maturity
securities
     3,375        4,298        11,033        13,249  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total interest income from investment securities
     $ 11,822        $ 13,520        $ 37,978        $ 43,234  
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Summary of Continuous Unrealized Loss Position of Securities
The following table presents the Company’s
available-for-sale
investment securities, by investment category, in an unrealized loss position for which an allowance for credit losses has not been recorded as of September 30, 2020.
 
   
September 30, 2020
   
    Less Than 12 Months    
 
    12 Months or Longer    
 
    Total    
   
Fair Value
 
Gross
Unrealized
Holding
Losses
 
Fair Value
 
 
Gross
Unrealized
Holding
Losses
 
Fair Value
 
Gross
Unrealized
Holding
Losses
   
 
(Dollars in thousands)
Investment securities
available-for-sale:
           
Mortgage-backed securities
    $ 30,851       $ (2)       $ -       $ -       $ 30,851       $ (2)  
CMO/REMIC
    71,781       (212)       -       -       71,781       (212)  
Municipal bonds
    -       -       -       -       -       -  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
available-for-sale
securities
    $ 102,632       $ (214)       $ -       $ -       $ 102,632       $ (214)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
December 31, 2019
   
    Less Than 12 Months    
 
    12 Months or Longer    
 
    Total    
   
Fair Value
 
Gross
Unrealized
Holding
Losses
 
Fair Value
 
 
Gross
Unrealized
Holding
Losses
 
Fair Value
 
Gross
Unrealized
Holding
Losses
   
 
(Dollars in thousands)
Investment securities
available-for-sale:
           
Mortgage-backed securities
    $ 20,289       $ (6)       $ 97,964       $ (744)       $ 118,253       $ (750)  
CMO/REMIC
    177,517       (705)       34,565       (191)       212,082       (896)  
Municipal bonds
    -       -       563       (2)       563       (2)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
available-for-sale
securities
    $ 197,806       $ (711)       $ 133,092       $ (937)       $ 330,898       $ (1,648)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investment securities
held-to-maturity:
           
Government agency/GSE
    $ 28,359       $ (252)       $ 19,405       $ (405)       $ 47,764       $ (657)  
Mortgage-backed securities
    10,411       (54)       -             10,411       (54)  
CMO/REMIC
    23,897       (104)       166,193       (2,354)       190,090       (2,458)  
Municipal bonds
    7,583       (32)       29,981       (533)       37,564       (565)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
held-to-maturity
securities
    $ 70,250       $ (442)       $ 215,579       $ (3,292)       $ 285,829       $ (3,734)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Mortgage-backed and CMO/REMIC securities are included in maturity categories based upon estimated average lives, which incorporate estimated prepayment speeds.
   
September 30, 2020
   
Available-for-sale
 
Held-to-maturity
   
  Amortized  
Cost
 
  Fair Value  
 
 
  Amortized  
Cost
 
  Fair Value  
   
 
(Dollars in thousands)
Due in one year or less
    $ 27,816       $ 27,968       $ 2,730       $ 2,764  
Due after one year through five years
    1,960,912       2,012,028       327,785       341,060  
Due after five years through ten years
    119,315       121,652       81,246       84,329  
Due after ten years
    42,321       43,998       165,933       175,369  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total investment securities
    $ 2,150,364       $ 2,205,646       $ 577,694       $ 603,522