Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details)

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STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 2,425,450 $ 2,513,102 $ 2,459,465 $ 1,924,581 $ 2,513,102 $ 1,924,581
Other comprehensive income (loss) 12,975 12,754 19,670 18,670 25,729 38,340
Ending balance 2,618,226 2,425,450 2,512,295 2,459,465 2,618,226 2,512,295
Unrealized Gains (Losses) on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 51,035 37,877 14,047 (5,949) 37,877 (5,949)
Other comprehensive income (loss) before reclassification 21,019   22,151   35,706 42,233
Amounts reclassified from AOCI into earnings (8,168)   (73)   (9,697) (159)
Other comprehensive income (loss) 12,851   22,078   26,009 42,074
Ending balance 63,886 51,035 36,125 14,047 63,886 36,125
Unrealized Gains (Losses) for AFS Securities Transferred to HTM            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 70 75 90 95 75 95
Other comprehensive income (loss) before reclassification 0   0   0 0
Amounts reclassified from AOCI into earnings (5)   (5)   (10) (10)
Other comprehensive income (loss) (5)   (5)   (10) (10)
Ending balance 65 70 85 90 65 85
Change in Fair Value of Cash Flow Hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 0 (782) (4,733) (3,393) (782) (3,393)
Other comprehensive income (loss) before reclassification 0   (2,595)   (699) (4,055)
Amounts reclassified from AOCI into earnings 0   173   1,481 293
Other comprehensive income (loss) 0   (2,422)   782 (3,762)
Ending balance 0 0 (7,155) (4,733) 0 (7,155)
Unrealized Gains (Losses) on BOLI            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (2,776) (1,595) (1,007) (1,026) (1,595) (1,026)
Other comprehensive income (loss) before reclassification 0   0   (1,289) 0
Amounts reclassified from AOCI into earnings 129   19   237 38
Other comprehensive income (loss) 129   19   (1,052) 38
Ending balance (2,647) (2,776) (988) (1,007) (2,647) (988)
Accumulated Other Comprehensive Income (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 48,329 35,575 8,397 (10,273) 35,575 (10,273)
Other comprehensive income (loss) before reclassification 21,019   19,556   33,718 38,178
Amounts reclassified from AOCI into earnings (8,044)   114   (7,989) 162
Other comprehensive income (loss) 12,975 12,754 19,670 18,670 25,729 38,340
Ending balance $ 61,304 $ 48,329 $ 28,067 $ 8,397 $ 61,304 $ 28,067