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 ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
May 01, 2018
AOCI Attributable to Parent, Net of Tax              
Beginning balance $ 2,459,465,000 $ 1,924,581,000 $ 1,831,077,000 $ 1,046,329,000 $ 1,924,581,000 $ 1,046,329,000  
Other comprehensive income (loss):              
Other comprehensive income (loss) 19,670,000 18,670,000 (1,628,000) (11,426,000) 38,340,000 (13,054,000)  
Ending balance 2,512,295,000 2,459,465,000 1,864,870,000 1,831,077,000 2,512,295,000 1,864,870,000  
Accounting Standards Update 2017-12              
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     400,000        
Cumulative effects from adoption of new accounting standard             $ 400,000
Accumulated Other Comprehensive Income (Loss)              
AOCI Attributable to Parent, Net of Tax              
Beginning balance 8,397,000 (10,273,000) (12,310,000) (884,000) (10,273,000) (884,000)  
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     0     0  
Cumulative effects from adoption of new accounting standard     (107,000)     (107,000)  
Other comprehensive income (loss) before reclassification 19,556,000   (1,911,000)   (38,178,000) (13,138,000)  
Amounts reclassified from AOCI into earnings 114,000   283,000   162,000 84,000  
Other comprehensive income (loss) 19,670,000 18,670,000 (1,628,000) (11,426,000) 38,340,000 (13,054,000)  
Ending balance 28,067,000 8,397,000 (14,045,000) (12,310,000) 28,067,000 (14,045,000)  
Unrealized Gains (Losses) on AFS Securities              
AOCI Attributable to Parent, Net of Tax              
Beginning balance 14,047,000 (5,949,000) (11,485,000) 1,874,000 (5,949,000) 1,874,000  
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     2,785,000     2,785,000  
Cumulative effects from adoption of new accounting standard     404,000     404,000  
Other comprehensive income (loss) before reclassification 22,151,000   (2,586,000)   (42,233,000) (15,777,000)  
Amounts reclassified from AOCI into earnings (73,000)   69,000   (159,000) (99,000)  
Other comprehensive income (loss) 22,078,000   (2,517,000)   42,074,000 (15,876,000)  
Ending balance 36,125,000 14,047,000 (10,813,000) (11,485,000) 36,125,000 (10,813,000)  
Unrealized Gains (Losses) for AFS Securities Transferred to HTM              
AOCI Attributable to Parent, Net of Tax              
Beginning balance 90,000 95,000 2,406,000 2,705,000 95,000 2,705,000  
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     (2,785,000)     (2,785,000)  
Cumulative effects from adoption of new accounting standard     583,000     583,000  
Other comprehensive income (loss) before reclassification 0   0   0 0  
Amounts reclassified from AOCI into earnings (5,000)   (99,000)   (10,000) (398,000)  
Other comprehensive income (loss) (5,000)   (99,000)   (10,000) (398,000)  
Ending balance 85,000 90,000 105,000 2,406,000 85,000 105,000  
Change in Fair Value of Cash Flow Hedge              
AOCI Attributable to Parent, Net of Tax              
Beginning balance (4,733,000) (3,393,000) (2,148,000) (4,361,000) (3,393,000) (4,361,000)  
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     0     0  
Cumulative effects from adoption of new accounting standard     (1,094,000)     (1,094,000)  
Other comprehensive income (loss) before reclassification (2,595,000)   675,000   4,055,000 2,639,000  
Amounts reclassified from AOCI into earnings 173,000   294,000   293,000 543,000  
Other comprehensive income (loss) (2,422,000)   969,000   (3,762,000) 3,182,000  
Ending balance (7,155,000) (4,733,000) (2,273,000) (2,148,000) (7,155,000) (2,273,000)  
Unrealized Gains (Losses) on BOLI              
AOCI Attributable to Parent, Net of Tax              
Beginning balance (1,007,000) (1,026,000) (1,083,000) (1,102,000) (1,026,000) (1,102,000)  
Other comprehensive income (loss):              
Transfers of HTM securities to AFS securities     0     0  
Cumulative effects from adoption of new accounting standard     0     0  
Other comprehensive income (loss) before reclassification 0   0   0 0  
Amounts reclassified from AOCI into earnings 19,000   19,000   38,000 38,000  
Other comprehensive income (loss) 19,000   19,000   38,000 38,000  
Ending balance $ (988,000) $ (1,007,000) $ (1,064,000) $ (1,083,000) $ (988,000) $ (1,064,000)