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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Securities available for sale |  |
Amortized Cost | $ 1,397,722 | $ 1,421,273
Gross Unrealized Gains | 16,174 | 4,065
Gross Unrealized Losses | (3,818) | (25,691)
Fair Value | 1,410,078 | 1,399,647
Securities held to maturity |  |
Amortized Cost | 364,463 | 373,763
Gross Unrealized Gains | 14,028 | 4,124
Gross Unrealized Losses | (1,435) | (6,663)
Fair Value | 377,056 | 371,224
Marketable equity securities, amortized cost | 55,831 | 55,471
Marketable equity securities, gross unrealized gains | 4,820 | 4,370
Marketable equity securities, gross unrealized losses | (1,073) | (3,203)
Marketable equity securities, fair value | 59,578 | 56,638
Total, amortized cost basis | 1,818,016 | 1,850,507
Total, gross unrealized gain | 35,022 | 12,559
Total, gross unrealized loss | (6,326) | (35,557)
Total, fair value | 1,846,712 | 1,827,509
Municipal bonds and obligations |  |
Securities available for sale |  |
Amortized Cost | 114,401 | 109,648
Gross Unrealized Gains | 5,477 | 2,272
Gross Unrealized Losses | (5) | (713)
Fair Value | 119,873 | 111,207
Securities held to maturity |  |
Amortized Cost | 257,232 | 264,524
Gross Unrealized Gains | 10,835 | 3,569
Gross Unrealized Losses | 0 | (3,601)
Fair Value | 268,067 | 264,492
Agency collateralized mortgage obligations |  |
Securities available for sale |  |
Amortized Cost | 882,124 | 944,946
Gross Unrealized Gains | 7,419 | 1,130
Gross Unrealized Losses | (581) | (15,192)
Fair Value | 888,962 | 930,884
Securities held to maturity |  |
Amortized Cost | 70,726 | 71,637
Gross Unrealized Gains | 2,975 | 533
Gross Unrealized Losses | (115) | (778)
Fair Value | 73,586 | 71,392
Agency mortgage-backed securities |  |
Securities available for sale |  |
Amortized Cost | 182,598 | 175,406
Gross Unrealized Gains | 739 | 36
Gross Unrealized Losses | (1,079) | (5,121)
Fair Value | 182,258 | 170,321
Securities held to maturity |  |
Amortized Cost | 6,758 | 7,219
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (57) | (297)
Fair Value | 6,701 | 6,922
Agency commercial mortgage-backed securities |  |
Securities available for sale |  |
Amortized Cost | 61,275 | 62,200
Gross Unrealized Gains | 465 | 0
Gross Unrealized Losses | (1,089) | (3,275)
Fair Value | 60,651 | 58,925
Securities held to maturity |  |
Amortized Cost | 10,385 | 10,417
Gross Unrealized Gains | 46 | 0
Gross Unrealized Losses | 0 | (289)
Fair Value | 10,431 | 10,128
Corporate bonds |  |
Securities available for sale |  |
Amortized Cost | 119,917 | 112,404
Gross Unrealized Gains | 880 | 342
Gross Unrealized Losses | (1,054) | (1,256)
Fair Value | 119,743 | 111,490
Trust preferred securities |  |
Securities available for sale |  |
Amortized Cost | 8,323 | 8,314
Gross Unrealized Gains | 231 | 251
Gross Unrealized Losses | (4) | (99)
Fair Value | 8,550 | 8,466
Other bonds and obligations |  |
Securities available for sale |  |
Amortized Cost | 29,084 | 8,355
Gross Unrealized Gains | 963 | 34
Gross Unrealized Losses | (6) | (35)
Fair Value | 30,041 | 8,354
Securities held to maturity |  |
Amortized Cost | 299 | 248
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 299 | 248
Tax advantaged economic development bonds |  |
Securities held to maturity |  |
Amortized Cost | 19,063 | 19,718
Gross Unrealized Gains | 172 | 22
Gross Unrealized Losses | (1,263) | (1,698)
Fair Value | $ 17,972 | $ 18,042

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