Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,001,032 $ 995,367 $ 977,169
Unrealized gain transferred from AFS to HTM     0
Other comprehensive income (loss) 2,892 (9,644) (5,034)
Amounts reclassified from accumulated other comprehensive income 33 (417) (969)
Other comprehensive income (loss) 2,925 (10,061) (6,003)
Ending balance 1,046,329 1,001,032 995,367
Unrealized Gains (Losses) on AFS Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (542) 7,777 17,439
Unrealized gain transferred from AFS to HTM     (5,251)
Other comprehensive income (loss) 2,936 (8,186) (3,640)
Amounts reclassified from accumulated other comprehensive income (520) (133) (771)
Other comprehensive income (loss) 2,416 (8,319) (4,411)
Ending balance 1,874 (542) 7,777
Unrealized Gain for AFS Securities Transferred to HTM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 3,377 4,432 0
Unrealized gain transferred from AFS to HTM     5,251
Other comprehensive income (loss) 0 0 0
Amounts reclassified from accumulated other comprehensive income (672) (1,055) (819)
Other comprehensive income (loss) (672) (1,055) (819)
Ending balance 2,705 3,377 4,432
Change in Fair Value of Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (5,179) (5,957) (5,184)
Unrealized gain transferred from AFS to HTM     0
Other comprehensive income (loss) (44) 270 (1,394)
Amounts reclassified from accumulated other comprehensive income 862 508 621
Other comprehensive income (loss) 818 778 (773)
Ending balance (4,361) (5,179) (5,957)
Unrealized Gains (Losses) on BOLI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,465) 0  
Other comprehensive income (loss) 0 (1,728)  
Amounts reclassified from accumulated other comprehensive income 363 263  
Other comprehensive income (loss) 363 (1,465)  
Ending balance (1,102) (1,465) 0
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (3,809) 6,252 12,255
Other comprehensive income (loss) 2,925 (10,061) (6,003)
Ending balance $ (884) $ (3,809) $ 6,252