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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Investment Securities
The amortized cost and estimated fair value of investment securities are summarized below. The majority of securities held are
available-for-sale
securities with fair value based on quoted prices for similar assets in active markets or quoted prices for identical assets in markets that are not active. Estimated fair values were obtained from an independent pricing service based upon market quotes.
                                         
 
June 30, 2019
 
   Amortized   
Cost
 
Gross
   Unrealized   
Holding
Gain
 
 
Gross
   Unrealized   
Holding
Loss
 
   Fair Value   
 
   Total Percent   
 
 
(Dollars in thousands)
Investment securities
available-for-sale:
   
     
     
     
     
 
Residential mortgage-backed securities
    $
1,348,415
      $
16,251
      $
(2,417
)     $
1,362,249
     
85.14%
 
CMO/REMIC - residential
   
194,094
     
1,216
     
(334
)    
194,976
     
12.19%
 
Municipal bonds
   
41,369
     
658
     
(41
)    
41,986
     
2.62%
 
Other securities
   
809
     
-
     
-
     
809
     
0.05%
 
Total
available-for-sale
securities
    $
1,584,687
      $
18,125
      $
(2,792
)     $
1,600,020
     
100.00%
 
Investment securities
held-to-maturity:
   
     
     
     
     
 
Government agency/GSE
    $
128,721
      $
2,627
      $
(414
)     $
130,934
     
17.68%
 
Residential mortgage-backed securities
   
175,552
     
1,480
     
(415
)    
176,617
     
24.11%
 
CMO
   
211,436
     
5
     
(4,358
)    
207,083
     
29.04%
 
Municipal bonds
   
212,404
     
3,245
     
(1,251
)    
214,398
     
29.17%
 
Total
held-to-maturity
securities
  $
728,113
      $
7,357
      $
(6,438
)     $
729,032
     
100.00%
 
     
 
December 31, 2018
 
   Amortized   
Cost
 
Gross
   Unrealized   
Holding
Gain
 
 
Gross
   Unrealized   
Holding
Loss
 
   Fair Value   
 
  Total Percent  
 
 
(Dollars in thousands)
Investment securities
available-for-sale:
   
     
     
     
     
 
Residential mortgage-backed securities
    $
1,494,106
      $
1,348
      $
(20,946
)     $
1,474,508
     
85.03%
 
CMO/REMIC - residential
   
217,223
     
353
     
(3,525
)    
214,051
     
12.34%
 
Municipal bonds
   
45,621
     
332
     
(1,143
)    
44,810
     
2.59%
 
Other securities
   
716
     
-
     
-  
     
716
     
0.04%
 
Total
available-for-sale
securities
    $
1,757,666
      $
2,033
      $
(25,614
)     $
1,734,085
     
100.00%
 
Investment securities
held-to-maturity:
   
     
     
     
     
 
Government agency/GSE
    $
138,274
      $
572
      $
(2,622
)     $
136,224
     
18.57%
 
Residential mortgage-backed securities
   
153,874
     
-
     
(3,140
)    
150,734
     
20.67%
 
CMO
   
215,336
     
-
     
(12,081
)    
203,255
     
28.93%
 
Municipal bonds
   
236,956
     
556
     
(6,188
)    
231,324
     
31.83%
 
Total
held-to-maturity
securities
    $
744,440
      $
1,128
      $
(24,031
)     $
721,537
     
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.
                                 
 
   For the Three Months Ended   
June 30,
   
   For the Six Months Ended   
June 30,
 
 
     2019     
   
     2018      
   
      2019      
   
      2018      
 
 
(Dollars in thousands)
 
Investment securities
available-for-sale:
   
     
     
     
 
Taxable
    $
9,821
      $
11,290
      $
20,130
      $
22,735
 
Tax-advantaged
   
297
     
407
     
633
     
830
 
                                 
Total interest income from
available-for-sale
securities
   
10,118
     
11,697
     
20,763
     
23,565
 
                                 
Investment securities
held-to-maturity:
   
     
     
     
 
Taxable
   
2,932
     
3,048
     
5,842
     
5,926
 
Tax-advantaged
   
1,494
     
1,759
     
3,109
     
3,646
 
                                 
Total interest income from
held-to-maturity
securities
   
4,426
     
4,807
     
8,951
     
9,572
 
                                 
Total interest income from investment securities
    $
14,544
      $
16,504
      $
29,714
      $
33,137
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Summary of Continuous Unrealized Loss Position of Securities
The tables below show 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 June 30, 2019 and December 31, 2018. Management has 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 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 (“OTTI”).
                                                 
 
June 30, 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:
   
     
     
     
     
     
 
Residential mortgage-backed securities
    $
-  
      $
-  
      $
228,518
      $
(2,417
)     $
228,518
      $
(2,417
)
CMO/REMIC - residential
   
-  
     
-  
     
71,924
     
(334
)    
71,924
     
(334
)
Municipal bonds
   
-  
     
-  
     
3,287
     
(41
)    
3,287
     
(41
)
Total
available-for-sale
securities
    $
-  
      $
-  
      $
303,729 
      $
(2,792
)     $
303,729
      $
(2,792
)
Investment securities
held-to-maturity:
   
     
     
     
     
     
 
Government agency/GSE
    $
-  
      $
-  
      $
39,016
      $
(414
)     $
39,016
      $
(414
)
Residential mortgage-backed securities
   
10,722  
     
(45
)    
75,536
     
(370
)    
86,258
     
(415
)
CMO
   
-  
     
-
     
201,974
     
(4,358
)    
201,974
     
(4,358
)
Municipal bonds
   
-  
     
-  
     
49,102
     
(1,251
)    
49,102
     
(1,251
)
Total
held-to-maturity
securities
    $
10,722  
      $
(45
)     $
365,628 
      $
(6,393
)     $   
376,350
      $   
(6,438
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
                                                 
 
    
December 31, 2018
 
    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:
   
     
     
     
     
     
 
Residential mortgage-backed securities
   $
692,311
      $
(4,864)
      $
593,367
      $  
(16,082)
      $
1,285,678
      $
(20,946)
 
CMO/REMIC - residential
   
36,582
     
(365)
     
135,062
     
(3,160)
     
171,644
     
(3,525)
 
Municipal bonds
   
9,568
     
(188)
     
14,181
     
(955)
     
23,749
     
(1,143)
 
Total
available-for-sale
securities
    $
738,461
      $
(5,417)
      $
742,610
      $
(20,197)
      $
1,481,071
      $
(25,614)
 
Investment securities
held-to-maturity:
   
     
     
     
     
     
 
Government agency/GSE
    $
7,479
      $
(15)
      $
54,944
      $
(2,607)
      $
62,423
      $
(2,622)
 
Residential mortgage-backed securities
   
59,871
     
(484)
     
90,863
     
(2,656)
     
150,734
     
(3,140)
 
CMO
   
-
     
     
203,254
     
(12,081)
     
203,254
     
(12,081)
 
Municipal bonds
   
70,989
     
(778)
     
77,723
     
(5,410)
     
148,712
     
(6,188)
 
Total
held-to-maturity
securities
    $  
138,339
      $
(1,277)
      $
426,784
      $   
(22,754)
      $  
565,123
      $
     (24,031)
 
 
 
 
 
 
 
 
 
 
 
 
 
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, 2019
 
Available-for-sale
 
Held-to-maturity
 
  Amortized  
Cost
 
  Fair Value  
 
 
  Amortized  
Cost
 
  Fair Value  
 
 
(Dollars in thousands)
Due in one year or less
    $
14,715 
      $
14,896 
      $
500 
      $
503 
 
Due after one year through five years
   
1,427,215
     
1,441,490 
     
315,591 
     
311,769 
 
Due after five years through ten years
   
114,977
     
115,535 
     
187,726 
     
189,711 
 
Due after ten years
   
27,780 
     
28,099 
     
224,296 
     
227,049 
 
Total investment securities
    $
1,584,687
      $
1,600,020
      $
728,113 
      $
729,032