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Investments Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments Securities [Abstract] |
Investment Securities |
| December 31, 2019
|  |  | Gross |  | Gross |  |  |  | Weighted
| Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Average
| Cost |  | Gains |  | Losses |  | Value |  | Yield
| (In thousands)
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 403,227 |  | $ | 846 |  | $ | 1,417 |  | $ | 402,656 |  | 2.00%
GNMA certificates |  | 215,755 |  |  | 718 |  |  | 4 |  |  | 216,469 |  | 2.33%
CMOs issued by US government-sponsored agencies |  | 55,235 |  |  | 16 |  |  | 490 |  |  | 54,761 |  | 1.97%
Total mortgage-backed securities |  | 674,217 |  |  | 1,580 |  |  | 1,911 |  |  | 673,886 |  | 2.11%
Investment securities |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | 397,183 |  |  | - |  |  | - |  |  | 397,183 |  | 1.60%
Obligations of US government-sponsored agencies |  | 1,967 |  |  | - |  |  | 6 |  |  | 1,961 |  | 1.38%
Other debt securities |  | 1,108 |  |  | 31 |  |  | - |  |  | 1,139 |  | 3.00%
Total investment securities |  | 400,258 |  |  | 31 |  |  | 6 |  |  | 400,283 |  | 1.60%
Total securities available for sale | $ | 1,074,475 |  | $ | 1,611 |  | $ | 1,917 |  | $ | 1,074,169 |  | 1.92%
| December 31, 2018
|  |  | Gross |  | Gross |  |  |  | Weighted
| Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Average
| Cost |  | Gains |  | Losses |  | Value |  | Yield
| (In thousands)
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 561,878 |  | $ | 404 |  | $ | 8,951 |  | $ | 553,331 |  | 2.59%
GNMA certificates |  | 211,947 |  |  | 1,050 |  |  | 2,827 |  |  | 210,170 |  | 3.10%
CMOs issued by US government-sponsored agencies |  | 66,230 |  |  | - |  |  | 2,166 |  |  | 64,064 |  | 1.90%
Total mortgage-backed securities |  | 840,055 |  |  | 1,454 |  |  | 13,944 |  |  | 827,565 |  | 2.66%
Investment securities |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | 10,924 |  |  | - |  |  | 119 |  |  | 10,805 |  | 1.36%
Obligations of US government-sponsored agencies |  | 2,325 |  |  | - |  |  | 60 |  |  | 2,265 |  | 1.38%
Other debt securities |  | 1,207 |  |  | 15 |  |  | - |  |  | 1,222 |  | 2.99%
Total investment securities |  | 14,456 |  |  | 15 |  |  | 179 |  |  | 14,292 |  | 1.50%
Total securities available-for-sale | $ | 854,511 |  | $ | 1,469 |  | $ | 14,123 |  | $ | 841,857 |  | 2.64%
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 424,740 |  | $ | - |  | $ | 14,387 |  | $ | 410,353 |  | 2.07%
| December 31, 2019
| Available-for-sale
| Amortized Cost |  | Fair Value
| (In thousands)
Mortgage-backed securities |  |  |  |  |
Due from 1 to 5 years |  |  |  |  |
FNMA and FHLMC certificates | $ | 1,611 |  | $ | 1,640
GNMA certificates |  | 785 |  |  | 785
Total due from 1 to 5 years |  | 2,396 |  |  | 2,425
Due after 5 to 10 years |  |  |  |  |
CMOs issued by US government-sponsored agencies | $ | 45,481 |  | $ | 45,003
FNMA and FHLMC certificates |  | 111,923 |  |  | 111,916
GNMA certificates |  | 80,675 |  |  | 80,676
Total due after 5 to 10 years |  | 238,079 |  |  | 237,595
Due after 10 years |  |  |  |  |
FNMA and FHLMC certificates | $ | 289,693 |  | $ | 289,100
GNMA certificates |  | 134,295 |  |  | 135,008
CMOs issued by US government-sponsored agencies |  | 9,754 |  |  | 9,758
Total due after 10 years |  | 433,742 |  |  | 433,866
Total mortgage-backed securities |  | 674,217 |  |  | 673,886
Investment securities |  |  |  |  |
Due less than one year |  |  |  |  |
US Treasury securities | $ | 377,153 |  | $ | 377,153
Other debt securities |  | 250 |  |  | 250
Total due in less than one year |  | 377,403 |  |  | 377,403
Due from 1 to 5 years |  |  |  |  |
Obligations of US government-sponsored agencies | $ | 1,967 |  | $ | 1,961
US Treasury securities |  | 20,030 |  |  | 20,030
Total due from 1 to 5 years |  | 21,997 |  |  | 21,991
Due from 5 to 10 years |  |  |  |  |
Other debt securities |  | 858 |  |  | 889
Total due after 5 to 10 years |  | 858 |  |  | 889
Total investment securities |  | 400,258 |  |  | 400,283
Total | $ | 1,074,475 |  | $ | 1,074,169
Gross Realized Gains and Losses by Category |
| Year Ended December 31, 2019
|  |  | Book Value |  |  |  |
Description | Sale Price |  | at Sale |  | Gross Gains |  | Gross Losses
| (In thousands)
Sale of securities available-for-sale |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 451,081 |  | $ | 447,305 |  | $ | 3,776 |  | $ | -
GNMA certificates |  | 229,385 |  |  | 224,887 |  |  | 4,498 |  |  | -
Total | $ | 680,466 |  | $ | 672,192 |  | $ | 8,274 |  | $ | -
| Year Ended December 31, 2018
|  |  | Book Value |  |  |  |
Description | Sale Price |  | at Sale |  | Gross Gains |  | Gross Losses
| (In thousands)
Sale of securities available-for-sale |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |
GNMA certificates | $ | 17,837 |  | $ | 17,837 |  | $ | - |  | $ | -
Total | $ | 17,837 |  | $ | 17,837 |  | $ | - |  | $ | -
| Year Ended December 31, 2017
|  |  | Book Value |  |  |  |
Description | Sale Price |  | at Sale |  | Gross Gains |  | Gross Losses
| (In thousands)
Sale of securities available-for-sale |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 107,510 |  | $ | 102,311 |  | $ | 5,199 |  | $ | -
GNMA certificates |  | 65,284 |  |  | 63,704 |  |  | 1,580 |  |  | -
Investment securities |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | 84,202 |  |  | 84,085 |  |  | 117 |  |  | -
Total mortgage-backed securities | $ | 256,996 |  | $ | 250,100 |  | $ | 6,896 |  | $ | -
Unrealized Gains and Losses by Category |
| December 31, 2019
| 12 months or more
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
CMOs issued by US Government-sponsored agencies | $ | 35,417 |  | $ | 387 |  | $ | 35,030
FNMA and FHLMC certificates |  | 259,099 |  |  | 1,415 |  |  | 257,684
Obligations of US Government and sponsored agencies |  | 1,967 |  |  | 6 |  |  | 1,961
GNMA certificates |  | 19 |  |  | - |  |  | 19
| $ | 296,502 |  | $ | 1,808 |  | $ | 294,694
| Less than 12 months
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
CMOs issued by US Government-sponsored agencies |  | 11,503 |  |  | 103 |  |  | 11,400
FNMA and FHLMC certificates |  | 4,919 |  |  | 2 |  |  | 4,917
GNMA certificates |  | 3,549 |  |  | 4 |  |  | 3,545
US Treasury Securities |  | 627 |  |  | - |  |  | 627
| $ | 20,598 |  | $ | 109 |  | $ | 20,489
| Total
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
CMOs issued by US government-sponsored agencies | $ | 46,920 |  | $ | 490 |  | $ | 46,430
FNMA and FHLMC certificates |  | 264,018 |  |  | 1,417 |  |  | 262,601
Obligations of US government and sponsored agencies |  | 1,967 |  |  | 6 |  |  | 1,961
GNMA certificates |  | 3,568 |  |  | 4 |  |  | 3,564
US Treasury Securities |  | 627 |  |  | - |  |  | 627
| $ | 317,100 |  | $ | 1,917 |  | $ | 315,183
| December 31, 2018
| 12 months or more
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
CMOs issued by US Government-sponsored agencies | $ | 66,230 |  | $ | 2,166 |  | $ | 64,064
FNMA and FHLMC certificates |  | 357,955 |  |  | 8,603 |  |  | 349,352
Obligations of US Government and sponsored agencies |  | 2,325 |  |  | 60 |  |  | 2,265
GNMA certificates |  | 131,044 |  |  | 2,739 |  |  | 128,305
US Treasury Securities |  | 9,977 |  |  | 119 |  |  | 9,858
| $ | 567,531 |  | $ | 13,687 |  | $ | 553,844
Securities held-to-maturity |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 424,740 |  | $ | 14,387 |  | $ | 410,353
| Less than 12 months
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
FNMA and FHLMC certificates |  | 109,772 |  |  | 348 |  |  | 109,424
GNMA certificates |  | 17,126 |  |  | 88 |  |  | 17,038
US Treasury Securities |  | 323 |  |  | - |  |  | 323
| $ | 127,221 |  | $ | 436 |  | $ | 126,785
| Total
| Amortized |  | Unrealized |  | Fair
| Cost |  | Loss |  | Value
| (In thousands)
Securities available-for-sale |  |  |  |  |  |  |  |
CMOs issued by US Government-sponsored agencies |  | 66,230 |  |  | 2,166 |  |  | 64,064
FNMA and FHLMC certificates |  | 467,727 |  |  | 8,951 |  |  | 458,776
Obligations of US government and sponsored agencies |  | 2,325 |  |  | 60 |  |  | 2,265
GNMA certificates |  | 148,170 |  |  | 2,827 |  |  | 145,343
US Treasury Securities |  | 10,300 |  |  | 119 |  |  | 10,181
| $ | 694,752 |  | $ | 14,123 |  | $ | 680,629
Securities held-to-maturity |  |  |  |  |  |  |  |
FNMA and FHLMC certificates | $ | 424,740 |  | $ | 14,387 |  | $ | 410,353

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