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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | $ 726,377 | $ 532,125
Gross Unrealized Gains | 6,633 | 5,627
Gross Unrealized Losses | 8,786 | 8,896
Available for sale securities | 724,224 | 528,856
Obligations of US Government sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 6,923 | 0
Gross Unrealized Gains | 53 | 0
Gross Unrealized Losses | 0 | 0
Available for sale securities | 6,976 | 0
US Government-sponsored enterprises |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 463,878 | 330,635
Gross Unrealized Gains | 2,993 | 2,682
Gross Unrealized Losses | 5,050 | 4,865
Available for sale securities | 461,821 | 328,452
US Government agency |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 82,371 | 76,722
Gross Unrealized Gains | 748 | 797
Gross Unrealized Losses | 670 | 613
Available for sale securities | 82,449 | 76,906
Private label |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 838 | 936
Gross Unrealized Gains | 193 | 207
Gross Unrealized Losses | 10 | 11
Available for sale securities | 1,021 | 1,132
Obligations of states and political subdivisions thereof |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 149,123 | 123,832
Gross Unrealized Gains | 2,534 | 1,941
Gross Unrealized Losses | 3,034 | 3,407
Available for sale securities | 148,623 | 122,366
Corporate bonds |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis |  |
Available-for-sale securities, amortized cost basis | 23,244 | 0
Gross Unrealized Gains | 112 | 0
Gross Unrealized Losses | 22 | 0
Available for sale securities | $ 23,334 | $ 0

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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