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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
May 01, 2018
AOCI Attributable to Parent, Net of Tax                  
Beginning balance $ 2,512,295,000 $ 2,459,465,000 $ 1,924,581,000 $ 1,864,870,000 $ 1,831,077,000 $ 1,046,329,000 $ 1,924,581,000 $ 1,046,329,000  
Other comprehensive income (loss):                  
Other comprehensive income (loss) 12,302,000 19,670,000 18,670,000 (10,571,000) (1,628,000) (11,426,000) 50,642,000 (23,625,000)  
Ending balance 2,525,031,000 2,512,295,000 2,459,465,000 1,880,029,000 1,864,870,000 1,831,077,000 2,525,031,000 1,880,029,000  
Accounting Standards Update 2017-12                  
Other comprehensive income (loss):                  
Cumulative effects from adoption of new accounting standard                 $ 400,000
Accounting Standards Update 2018-02                  
Other comprehensive income (loss):                  
Amounts reclassified from AOCI into earnings         107,000        
Accumulated Other Comprehensive Income (Loss)                  
AOCI Attributable to Parent, Net of Tax                  
Beginning balance 28,067,000 8,397,000 (10,273,000) (14,045,000) (12,310,000) (884,000) (10,273,000) (884,000)  
Other comprehensive income (loss):                  
Transfers of HTM securities to AFS securities               0  
Cumulative effects from adoption of new accounting standard       (107,000)       (107,000)  
Other comprehensive income (loss) before reclassification 17,742,000     (10,735,000)     (55,921,000) (23,873,000)  
Amounts reclassified from AOCI into earnings (5,440,000)     164,000     (5,279,000) 248,000  
Other comprehensive income (loss) 12,302,000 19,670,000 18,670,000 (10,571,000) (1,628,000) (11,426,000) 50,642,000 (23,625,000)  
Ending balance 40,369,000 28,067,000 8,397,000 (24,616,000) (14,045,000) (12,310,000) 40,369,000 (24,616,000)  
Unrealized Gains (Losses) on AFS Securities                  
AOCI Attributable to Parent, Net of Tax                  
Beginning balance 36,125,000   (5,949,000) (10,813,000)   1,874,000 (5,949,000) 1,874,000  
Other comprehensive income (loss):                  
Transfers of HTM securities to AFS securities               2,785,000  
Cumulative effects from adoption of new accounting standard       404,000       404,000  
Other comprehensive income (loss) before reclassification 12,364,000     (11,310,000)     (54,598,000) (27,087,000)  
Amounts reclassified from AOCI into earnings (5,612,000)     (77,000)     (5,772,000) (176,000)  
Other comprehensive income (loss) 6,752,000     (11,387,000)     48,826,000 (27,263,000)  
Ending balance 42,877,000 36,125,000   (22,200,000) (10,813,000)   42,877,000 (22,200,000)  
Unrealized Gains (Losses) for AFS Securities Transferred to HTM                  
AOCI Attributable to Parent, Net of Tax                  
Beginning balance 85,000   95,000 105,000   2,705,000 95,000 2,705,000  
Other comprehensive income (loss):                  
Transfers of HTM securities to AFS securities               (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)     (5,000)     (15,000) (403,000)  
Other comprehensive income (loss) (5,000)     (5,000)     (15,000) (403,000)  
Ending balance 80,000 85,000   100,000 105,000   80,000 100,000  
Change in Fair Value of Cash Flow Hedge                  
AOCI Attributable to Parent, Net of Tax                  
Beginning balance (7,155,000)   (3,393,000) (2,273,000)   (4,361,000) (3,393,000) (4,361,000)  
Other comprehensive income (loss):                  
Transfers of HTM securities to AFS securities               0  
Cumulative effects from adoption of new accounting standard       (1,094,000)       (1,094,000)  
Other comprehensive income (loss) before reclassification 6,025,000     575,000     (1,970,000) 3,214,000  
Amounts reclassified from AOCI into earnings 158,000     227,000     451,000 770,000  
Other comprehensive income (loss) 6,183,000     802,000     2,421,000 3,984,000  
Ending balance (972,000) (7,155,000)   (1,471,000) (2,273,000)   (972,000) (1,471,000)  
Unrealized Gains (Losses) on BOLI                  
AOCI Attributable to Parent, Net of Tax                  
Beginning balance (988,000)   $ (1,026,000) (1,064,000)   $ (1,102,000) (1,026,000) (1,102,000)  
Other comprehensive income (loss):                  
Transfers of HTM securities to AFS securities               0  
Cumulative effects from adoption of new accounting standard       0       0  
Other comprehensive income (loss) before reclassification (647,000)     0     647,000 0  
Amounts reclassified from AOCI into earnings 19,000     19,000     57,000 57,000  
Other comprehensive income (loss) (628,000)     19,000     (590,000) 57,000  
Ending balance $ (1,616,000) $ (988,000)   $ (1,045,000) $ (1,064,000)   $ (1,616,000) $ (1,045,000)