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
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax    
Beginning balance $ 1,924,581 $ 1,046,329
Other comprehensive income (loss):    
Other comprehensive income (loss) before reclassification 18,621 (11,227)
Amounts reclassified from AOCI into earnings 49 (199)
Net current period other comprehensive income (loss) 18,670 (11,426)
Ending balance 2,459,465 1,831,077
AOCI Attributable to Parent    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (10,273) (884)
Other comprehensive income (loss):    
Net current period other comprehensive income (loss) 18,670 (11,426)
Ending balance 8,397 (12,310)
Unrealized Gains (Losses) on AFS Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (5,949) 1,874
Other comprehensive income (loss):    
Other comprehensive income (loss) before reclassification 20,081 (13,191)
Amounts reclassified from AOCI into earnings (85) (168)
Net current period other comprehensive income (loss) 19,996 (13,359)
Ending balance 14,047 (11,485)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 95 2,705
Other comprehensive income (loss):    
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from AOCI into earnings (5) (299)
Net current period other comprehensive income (loss) (5) (299)
Ending balance 90 2,406
Change in Fair Value of Cash Flow Hedge    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (3,393) (4,361)
Other comprehensive income (loss):    
Other comprehensive income (loss) before reclassification (1,460) 1,964
Amounts reclassified from AOCI into earnings 120 249
Net current period other comprehensive income (loss) (1,340) 2,213
Ending balance (4,733) (2,148)
Unrealized Gains (Losses) on BOLI    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (1,026) (1,102)
Other comprehensive income (loss):    
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from AOCI into earnings 19 19
Net current period other comprehensive income (loss) 19 19
Ending balance $ (1,007) $ (1,083)