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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Investment Securities
   
June 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
      $ 1,191,431       $ 46,868       $ -       $ 1,238,299       73.88%  
CMO/REMIC
    391,586       8,962       (12)       400,536       23.90%  
Municipal bonds
    35,015       1,438       -       36,453       2.17%  
Other securities
    779       -       -       779       0.05%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
available-for-sale
securities
    $ 1,618,811       $ 57,268       $ (12)       $ 1,676,067       100.00%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investment securities
held-to-maturity:
         
Government agency/GSE
    $ 106,981       $ 6,285       $ -       $ 113,266       17.45%  
Mortgage-backed securities
    164,174       8,135       -       172,309       26.77%  
CMO/REMIC
    171,821       5,283       -       177,104       28.02%  
Municipal bonds
    170,193       6,418       (340)       176,271       27.76%  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
held-to-maturity
securities
    $ 613,169       $ 26,121       $ (340)       $ 638,950       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    

June 30,
    
    Six Months Ended    

June 30,
 
    
2020
    
2019
    
2020
    
2019
 
    
 
(Dollars in thousands)
 
Investment securities
available-for-sale:
           
Taxable
     $ 8,244        $ 9,821        $ 18,069        $ 20,130  
Tax-advantaged
     205        297        429        633  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total interest income from
available-for-sale
securities
     8,449        10,118        18,498        20,763  
  
 
 
    
 
 
    
 
 
    
 
 
 
Investment securities
held-to-maturity:
           
Taxable
     2,447        2,932        5,145        5,842  
Tax-advantaged
     1,213        1,494        2,513        3,109  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total interest income from
held-to-maturity
securities
     3,660        4,426        7,658        8,951  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total interest income from investment securities
     $ 12,109        $ 14,544        $ 26,156        $ 29,714  
  
 
 
    
 
 
    
 
 
    
 
 
 
Summary of Continuous Unrealized Loss Position of Securities
The table below presents the Company’s investment securities’ gross unrealized losses and fair value by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2019, prior to adoption of ASU
2016-13.
Management previously reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. The unrealized losses on these securities were primarily attributed to changes in interest rates. The issuers of these securities have not, to our knowledge, evidenced any cause for default on these securities. These securities have fluctuated in value since their purchase dates as market interest rates have fluctuated. However, we have the ability and the intention to hold these securities until their fair values recover to cost or maturity. As such, management does not deem these securities to be other-than-temporarily-impaired.
   
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.
   
June 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
    $ 40,755       $ 41,076       $ 2,075       $ 2,113  
Due after one year through five years
    1,224,722       1,275,526       341,272       354,456  
Due after five years through ten years
    154,864       159,124       96,738       100,064  
Due after ten years
    198,470       200,341       173,084       182,317  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total investment securities
    $ 1,618,811       $ 1,676,067       $ 613,169       $ 638,950