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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
May 01, 2018
AOCI Attributable to Parent, Net of Tax            
Beginning balance     $ 1,046,329,000 $ 1,001,032,000    
Transfer of HTM securities to AFS securities $ 0   0      
Cumulative effects from adoption of new accounting standard (107,000)   (107,000)   $ 0  
Other comprehensive income (loss) before reclassification (10,735,000) $ (2,688,000) (23,873,000) 5,169,000    
Amounts reclassified from AOCI into earnings 164,000 (9,000) 248,000 (49,000)    
Net current period other comprehensive income (loss) (10,571,000) (2,697,000) (23,625,000) 5,120,000    
Ending balance 1,880,029,000 1,041,371,000 1,880,029,000 1,041,371,000    
Accumulated Other Comprehensive Income (Loss)            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (14,045,000) 4,008,000 (884,000) (3,809,000)    
Net current period other comprehensive income (loss)     (23,625,000) 5,120,000    
Ending balance (24,616,000) 1,311,000 (24,616,000) 1,311,000    
Unrealized Gains (Losses) on AFS Securities            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (10,813,000) 7,733,000 1,874,000 (542,000)    
Transfer of HTM securities to AFS securities 0   2,785,000      
Cumulative effects from adoption of new accounting standard 404,000   404,000   0  
Other comprehensive income (loss) before reclassification (11,310,000) (2,729,000) (27,087,000) 5,935,000    
Amounts reclassified from AOCI into earnings (77,000) (119,000) (176,000) (508,000)    
Net current period other comprehensive income (loss) (11,387,000) (2,848,000) (27,263,000) 5,427,000    
Ending balance (22,200,000) 4,885,000 (22,200,000) 4,885,000    
Unrealized Gain for AFS Securities Transferred to HTM            
AOCI Attributable to Parent, Net of Tax            
Beginning balance 105,000 3,033,000 2,705,000 3,377,000    
Transfer of HTM securities to AFS securities 0   (2,785,000)      
Cumulative effects from adoption of new accounting standard 583,000   583,000   0  
Other comprehensive income (loss) before reclassification 0 0 0 0    
Amounts reclassified from AOCI into earnings (5,000) (163,000) (403,000) (507,000)    
Net current period other comprehensive income (loss) (5,000) (163,000) (403,000) (507,000)    
Ending balance 100,000 2,870,000 100,000 2,870,000    
Change in Fair Value of Cash Flow Hedge            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (2,273,000) (5,487,000) (4,361,000) (5,179,000)    
Transfer of HTM securities to AFS securities 0   0      
Cumulative effects from adoption of new accounting standard (1,094,000)   (1,094,000)   0  
Other comprehensive income (loss) before reclassification 575,000 41,000 3,214,000 (766,000)    
Amounts reclassified from AOCI into earnings 227,000 189,000 770,000 688,000    
Net current period other comprehensive income (loss) 802,000 230,000 3,984,000 (78,000)    
Ending balance (1,471,000) (5,257,000) (1,471,000) (5,257,000)    
Unrealized Gains (Losses) on BOLI            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (1,064,000) (1,271,000) (1,102,000) (1,465,000)    
Transfer of HTM securities to AFS securities 0   0      
Cumulative effects from adoption of new accounting standard 0   0   $ 0  
Other comprehensive income (loss) before reclassification 0 0 0 0    
Amounts reclassified from AOCI into earnings 19,000 84,000 57,000 278,000    
Net current period other comprehensive income (loss) 19,000 84,000 57,000 278,000    
Ending balance (1,045,000) $ (1,187,000) $ (1,045,000) $ (1,187,000)    
Accounting Standards Update 2017-12            
AOCI Attributable to Parent, Net of Tax            
Transfer of HTM securities to AFS securities 400,000          
Cumulative effects from adoption of new accounting standard           $ 400,000
Accounting Standards Update 2018-02            
AOCI Attributable to Parent, Net of Tax            
Reclassification from AOCI $ 107,000