Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Change in Accumulated Other Comprehensive Income) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Change in Accumulated Other Comprehensive Income) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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)    
Other comprehensive income (loss) before reclassification (1,911,000) $ 4,252,000 (13,138,000) 7,857,000  
Amounts reclassified from AOCI into earnings 283,000 167,000 84,000 (40,000)  
Net current period other comprehensive income (loss) (1,628,000) 4,419,000 (13,054,000) 7,817,000  
Ending balance 1,864,870,000 1,030,869,000 1,864,870,000 1,030,869,000  
Accumulated Other Comprehensive Income (Loss)          
AOCI Attributable to Parent, Net of Tax          
Beginning balance (12,310,000) (411,000) (884,000) (3,809,000)  
Net current period other comprehensive income (loss)     (13,054,000) 7,817,000  
Ending balance (14,045,000) 4,008,000 (14,045,000) 4,008,000  
Unrealized Gains (Losses) on AFS Securities          
AOCI Attributable to Parent, Net of Tax          
Beginning balance (11,485,000) 2,782,000 1,874,000 (542,000)  
Transfer 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 (2,586,000) 5,027,000 (15,777,000) 8,664,000  
Amounts reclassified from AOCI into earnings 69,000 (76,000) (99,000) (389,000)  
Net current period other comprehensive income (loss) (2,517,000) 4,951,000 (15,876,000) 8,275,000  
Ending balance (10,813,000) 7,733,000 (10,813,000) 7,733,000  
Unrealized Gain for AFS Securities Transferred to HTM          
AOCI Attributable to Parent, Net of Tax          
Beginning balance 2,406,000 3,193,000 2,705,000 3,377,000  
Transfer 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 (99,000) (160,000) (398,000) (344,000)  
Net current period other comprehensive income (loss) (99,000) (160,000) (398,000) (344,000)  
Ending balance 105,000 3,033,000 105,000 3,033,000  
Change in Fair Value of Cash Flow Hedge          
AOCI Attributable to Parent, Net of Tax          
Beginning balance (2,148,000) (5,030,000) (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)    
Other comprehensive income (loss) before reclassification 675,000 (775,000) 2,639,000 (807,000)  
Amounts reclassified from AOCI into earnings 294,000 318,000 543,000 499,000  
Net current period other comprehensive income (loss) 969,000 (457,000) 3,182,000 (308,000)  
Ending balance (2,273,000) (5,487,000) (2,273,000) (5,487,000)  
Unrealized Gains (Losses) on BOLI          
AOCI Attributable to Parent, Net of Tax          
Beginning balance (1,083,000) (1,356,000) (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    
Other comprehensive income (loss) before reclassification 0   0 0  
Amounts reclassified from AOCI into earnings 19,000 85,000 38,000 194,000  
Net current period other comprehensive income (loss) 19,000 85,000 38,000 194,000  
Ending balance (1,064,000) $ (1,271,000) $ (1,064,000) $ (1,271,000)  
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