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 ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax    
Beginning balance $ 1,046,329 $ 1,001,032
Other comprehensive income (loss) (11,227) 3,606
Amounts reclassified from accumulated other comprehensive income (199) (208)
Net current period other comprehensive income (loss) (11,426) 3,398
Ending balance 1,831,077 1,015,631
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (884) (3,809)
Net current period other comprehensive income (loss) (11,426) 3,398
Ending balance (12,310) (411)
Unrealized Gains (Losses) on AFS Securities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 1,874 (542)
Other comprehensive income (loss) (13,191) 3,637
Amounts reclassified from accumulated other comprehensive income (168) (313)
Net current period other comprehensive income (loss) (13,359) 3,324
Ending balance (11,485) 2,782
Unrealized Gain for AFS Securities Transferred to HTM    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 2,705 3,377
Other comprehensive income (loss) 0 0
Amounts reclassified from accumulated other comprehensive income (299) (184)
Net current period other comprehensive income (loss) (299) (184)
Ending balance 2,406 3,193
Change in Fair Value of Cash Flow Hedge    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (4,361) (5,179)
Other comprehensive income (loss) 1,964 (31)
Amounts reclassified from accumulated other comprehensive income 249 180
Net current period other comprehensive income (loss) 2,213 149
Ending balance (2,148) (5,030)
Unrealized Gains (Losses) on BOLI    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (1,102) (1,465)
Other comprehensive income (loss) 0 0
Amounts reclassified from accumulated other comprehensive income 19 109
Net current period other comprehensive income (loss) 19 109
Ending balance $ (1,083) $ (1,356)