STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | $ 2,618,226 | $ 2,425,450 | $ 2,513,102 | $ 2,512,295 | $ 2,459,465 | $ 1,924,581 | $ 2,513,102 | $ 1,924,581 |
| Total stockholders' equity | 2,618,226 | 2,618,226 | 2,425,450 | 2,525,031 | 2,512,295 | 2,459,465 | 2,513,102 | 2,525,031 |
| Other comprehensive income (loss) | 1,358 | 12,975 | 12,754 | 12,302 | 19,670 | 18,670 | 27,087 | 50,642 |
| Ending balance | 2,660,885 | 2,618,226 | 2,425,450 | 2,525,031 | 2,512,295 | 2,459,465 | 2,660,885 | 2,525,031 |
| Unrealized Gains (Losses) on AFS Securities | ||||||||
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | 63,886 | 37,877 | 36,125 | (5,949) | 37,877 | (5,949) | ||
| Total stockholders' equity | 65,122 | 63,886 | 37,877 | 42,877 | 36,125 | (5,949) | 37,877 | 42,877 |
| Other comprehensive income (loss) before reclassification | 1,250 | 12,364 | 36,956 | 54,598 | ||||
| Amounts reclassified from AOCI into earnings | (14) | (5,612) | (9,711) | (5,772) | ||||
| Other comprehensive income (loss) | 1,236 | 6,752 | 27,245 | 48,826 | ||||
| Ending balance | 65,122 | 63,886 | 42,877 | 36,125 | 65,122 | 42,877 | ||
| Unrealized Gains (Losses) for AFS Securities Transferred to HTM | ||||||||
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | 65 | 75 | 85 | 95 | 75 | 95 | ||
| Total stockholders' equity | 60 | 65 | 75 | 80 | 85 | 95 | 75 | 95 |
| Other comprehensive income (loss) before reclassification | 0 | 0 | 0 | 0 | ||||
| Amounts reclassified from AOCI into earnings | (5) | (5) | (15) | (15) | ||||
| Other comprehensive income (loss) | (5) | (5) | (15) | (15) | ||||
| Ending balance | 60 | 65 | 80 | 85 | 60 | 80 | ||
| Change in Fair Value of Cash Flow Hedges | ||||||||
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | 0 | (782) | (7,155) | (3,393) | (782) | (3,393) | ||
| Total stockholders' equity | 0 | 0 | (782) | (972) | (7,155) | (3,393) | 0 | (972) |
| Other comprehensive income (loss) before reclassification | 0 | 6,025 | (699) | 1,970 | ||||
| Amounts reclassified from AOCI into earnings | 0 | 158 | 1,481 | 451 | ||||
| Other comprehensive income (loss) | 0 | 6,183 | 782 | 2,421 | ||||
| Ending balance | 0 | 0 | (972) | (7,155) | 0 | (972) | ||
| Unrealized Gains (Losses) on BOLI | ||||||||
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | (2,647) | (1,595) | (988) | (1,026) | (1,595) | (1,026) | ||
| Total stockholders' equity | (2,520) | (2,647) | (1,595) | (1,616) | (988) | (1,026) | (2,520) | (1,026) |
| Other comprehensive income (loss) before reclassification | 0 | (647) | (1,289) | (647) | ||||
| Amounts reclassified from AOCI into earnings | 127 | 19 | 364 | 57 | ||||
| Other comprehensive income (loss) | 127 | (628) | (925) | (590) | ||||
| Ending balance | (2,520) | (2,647) | (1,616) | (988) | (2,520) | (1,616) | ||
| Accumulated Other Comprehensive Income (Loss) | ||||||||
| AOCI Attributable to Parent, Net of Tax [Roll Forward] | ||||||||
| Beginning balance | 61,304 | 48,329 | 35,575 | 28,067 | 8,397 | (10,273) | 35,575 | (10,273) |
| Total stockholders' equity | 62,662 | 61,304 | 48,329 | 40,369 | 28,067 | 8,397 | 62,662 | 40,369 |
| Other comprehensive income (loss) before reclassification | 1,250 | 17,742 | 34,968 | 55,921 | ||||
| Amounts reclassified from AOCI into earnings | 108 | (5,440) | (7,881) | (5,279) | ||||
| Other comprehensive income (loss) | 1,358 | 12,975 | 12,754 | 12,302 | 19,670 | 18,670 | 27,087 | 50,642 |
| Ending balance | $ 62,662 | $ 61,304 | $ 48,329 | $ 40,369 | $ 28,067 | $ 8,397 | $ 62,662 | $ 40,369 |