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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($)
INVESTMENT SECURITIES |  |  |  |  |
Available-for-sale Securities, Sold at Par | $ 97,700 | $ 119,400 |  |  |
Held-to-maturity Securities |  |  | $ 191,753 | $ 217,668 |
Held-to-maturity Securities, Fair Value |  |  | 189,201 | 214,366 |
Available for Sale, Amortized Cost |  |  |  |  |
Due in one year or less |  |  | 8,796 |  |
Due after one year through five years |  |  | 165,356 |  |
Due after five years through ten years |  |  | 40,762 |  |
Due after ten years |  |  | 62,836 |  |
Mortgage-backed securities |  |  | 1,307,427 | 1,246,728 |
Other |  |  | 686 |  |
Total |  |  | 1,307,427 |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Due in one year or less |  |  | 8,799 |  |
Due after one year through five years |  |  | 166,447 |  |
Due after five years through ten years |  |  | 41,166 |  |
Due after ten years |  |  | 63,157 |  |
Other |  |  | 825 |  |
Available-for-sale, at fair value |  |  | 1,304,891 | 1,243,847 |
Available for sale |  |  |  |  |
Gross proceeds from sale of available for sale investment securities |  |  | 114,536 | 0 | $ 117,496
Purchases of investment securities available for sale | $ 97,400 | $ 120,600 | 356,887 | 195,456 | $ 344,766
Available-for-sale Securities, Average Term of Securities Sold | 3 years 3 months 24 days |  |  |  |
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 Term of Securities Acquired | 4 years 6 months 24 days |  |  |  |
Available-for-sale Securities, Average Yield of Securities Acquired | 2.57% |  |  |  |
Available-for-sale Securities, Gross Realized Losses | $ 1,600 |  |  |  |
Average net yield of available for sale mortgage backed securities sold |  | 1.35% |  |  |
Weighted average life of available for sale mortgage backed securities sold |  | 4 years 4 months 24 days |  |  |
Net realized gains on the sales of the available for sale investment securities |  | $ 1,900 |  |  |
Investment securities pledged to party with no right to sell or repledge the collateral |  |  | $ 1,080,000 | $ 1,050,000 |
Number of investment securities in an unrealized loss position | security |  |  | 223 | 242 |
Residential-U.S. Government sponsored entities |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Held-to-maturity Securities |  |  | $ 100,279 |  |
Held-to-maturity Securities, Fair Value |  |  | 98,163 | $ 121,700 |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities |  |  | 808,242 | 775,803 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale, at fair value |  |  | 800,683 | 769,986 |
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member] |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Held-to-maturity Securities |  |  |  | 124,082 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities |  |  | 800,683 |  |
Non Agency Commercial Mortgage Backed Securities and Corporate Bond Securities |  |  |  |  |
Available for sale |  |  |  |  |
Average net yield of available for sale mortgage backed securities sold |  | 2.71% |  |  |
Weighted average life of available for sale mortgage backed securities sold |  | 7 years 7 months 6 days |  |  |
Commercial-U.S. Government sponsored entities |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Held-to-maturity Securities |  |  | 91,474 |  |
Held-to-maturity Securities, Fair Value |  |  | 91,038 | 92,666 |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities |  |  | 135,058 | 135,248 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale, at fair value |  |  | 137,326 | 137,224 |
Mortgage-backed Securities, Issued by Private Enterprises, Residential [Member] |  |  |  |  |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities |  |  | 45,679 | 51,681 |
Available for Sale, Estimated Fair Value |  |  |  |  |
Available-for-sale, at fair value |  |  | 46,763 | $ 51,547 |
Commercial-U.S. Government agencies and sponsored entities |  |  |  |  |
Available for Sale, Amortized Cost |  |  |  |  |
Mortgage-backed securities |  |  | 40,012 |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities |  |  | 46,763 |  |
Available-for-sale, at fair value |  |  | 39,725 |  |
Mortgage Backed Securities Residential Non Government Agencies [Member] |  |  |  |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities |  |  | 39,725 |  |
Mortgage Backed Securities Commercial Non Government Agencies [Member] |  |  |  |  |
Available for Sale, Estimated Fair Value |  |  |  |  |
Mortgage-backed securities |  |  | $ 137,326 |  |

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