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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($)
INVESTMENT SECURITIES |  |  |  |  |
Available-for-sale Securities, Sold at Par |  | $ 97,700 |  |  |
Held-to-maturity Securities | $ 148,508 |  | $ 148,508 | $ 191,753 |
Held-to-maturity Securities, Fair Value | 144,272 |  | 144,272 | 189,201 |
Available for Sale, Amortized Cost |  |  |  |  |
Due in one year or less | 65,470 |  | 65,470 |  |
Due after one year through five years | 95,013 |  | 95,013 |  |
Due after five years through ten years | 48,081 |  | 48,081 |  |
Due after ten years | 54,066 |  | 54,066 |  |
Mortgage-backed securities | 1,227,931 |  | 1,227,931 | 1,306,741 |
Total | 1,227,931 |  | 1,227,931 |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Due in one year or less | 65,485 |  | 65,485 |  |
Due after one year through five years | 94,653 |  | 94,653 |  |
Due after five years through ten years | 47,809 |  | 47,809 |  |
Due after ten years | 53,150 |  | 53,150 |  |
Available-for-sale investment securities, at fair value | 1,205,478 |  | 1,205,478 | 1,304,066 |
Available for sale |  |  |  |  |
Gross proceeds from sale of available for sale investment securities | 10,000 |  | 10,014 | 114,536 | $ 0
Purchases of investment securities available for sale |  | $ 97,400 | 85,366 | 356,887 | $ 195,456
Available-for-sale Securities, Average Yield of Securities Sold |  | 1.91% |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds |  | $ 96,000 |  |  |
Available-for-sale Securities, Average Yield of Securities Acquired |  | 2.57% |  |  |
Available-for-sale Securities, Gross Realized Losses | 300 | $ 1,600 |  |  |
Investment securities pledged to party with no right to sell or repledge the collateral | $ 980,000 |  | $ 980,000 | $ 1,080,000 |
Number of investment securities in an unrealized loss position | security | 336 |  | 336 | 223 |
Available-for-sale Securities, Equity Securities | $ 826 |  | $ 826 | $ 825 |
Residential - U.S. Government-sponsored entities (GSEs) |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Held-to-maturity Securities | 83,436 |  | 83,436 | 100,279 |
Held-to-maturity Securities, Fair Value | 80,281 |  | 80,281 | 98,163 |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities | 736,175 |  | 736,175 | 808,242 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale investment securities, at fair value | 717,052 |  | 717,052 | 800,683 |
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member] |  |  |  |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities | 717,052 |  | 717,052 |  |
Commercial - U.S. GSEs |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Held-to-maturity Securities | 65,072 |  | 65,072 | 91,474 |
Held-to-maturity Securities, Fair Value | 63,991 |  | 63,991 | 91,038 |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities | 134,867 |  | 134,867 | 135,058 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale investment securities, at fair value | 134,728 |  | 134,728 | 137,326 |
Mortgage-backed Securities, Issued by Private Enterprises, Residential [Member] |  |  |  |  |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities | 41,245 |  | 41,245 | 45,679 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale investment securities, at fair value | 41,118 |  | 41,118 | 46,763 |
Commercial - U.S. GSEs and agencies |  |  |  |  |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities | 53,014 |  | 53,014 | 40,012 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities | 41,118 |  | 41,118 |  |
Available-for-sale investment securities, at fair value | 51,483 |  | 51,483 | 39,725 |
Mortgage Backed Securities Residential Non Government Agencies [Member] |  |  |  |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities | 51,483 |  | 51,483 |  |
Mortgage Backed Securities Commercial Non Government Agencies [Member] |  |  |  |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities | 134,728 |  | 134,728 |  |
Equity securities |  |  |  |  |
Available for sale |  |  |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 826 |  | 826 | 825 |
Available-for-sale Securities, Equity Securities | $ 826 |  | $ 826 | $ 825 |

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