Annual report pursuant to Section 13 and 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 ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,046,329 $ 1,001,032 $ 995,367
Other comprehensive income (loss) before reclassification   2,892 (9,644)
Amounts reclassified from accumulated other comprehensive income   33 (417)
Other comprehensive income (loss) (9,343) 2,925 (10,061)
Ending balance 1,924,581 1,046,329 1,001,032
Unrealized Gains (Losses) on AFS Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1,874 (542) 7,777
Transfer of HTM securities to AFS securities 2,785    
Cumulative effects from adoption of new accounting standards 465    
Other comprehensive income (loss) before reclassification (10,711) 2,936 (8,186)
Amounts reclassified from accumulated other comprehensive income (362) (520) (133)
Other comprehensive income (loss) (11,073) 2,416 (8,319)
Ending balance (5,949) 1,874 (542)
Unrealized Gains (Losses) for AFS Securities Transferred to HTM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 2,705 3,377 4,432
Transfer of HTM securities to AFS securities (2,785)    
Cumulative effects from adoption of new accounting standards 583    
Other comprehensive income (loss) before reclassification 0 0 0
Amounts reclassified from accumulated other comprehensive income (408) (672) (1,055)
Other comprehensive income (loss) (408) (672) (1,055)
Ending balance 95 2,705 3,377
Change in Fair Value of Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (4,361) (5,179) (5,957)
Transfer of HTM securities to AFS securities 0    
Cumulative effects from adoption of new accounting standards (1,094)    
Other comprehensive income (loss) before reclassification 1,087 (44) 270
Amounts reclassified from accumulated other comprehensive income 975 862 508
Other comprehensive income (loss) 2,062 818 778
Ending balance (3,393) (4,361) (5,179)
Unrealized Gains (Losses) on BOLI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,102) (1,465) 0
Transfer of HTM securities to AFS securities 0    
Cumulative effects from adoption of new accounting standards 0    
Other comprehensive income (loss) before reclassification 0 0 (1,728)
Amounts reclassified from accumulated other comprehensive income 76 363 263
Other comprehensive income (loss) 76 363 (1,465)
Ending balance (1,026) (1,102) (1,465)
AOCI Attributable to Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (884) (3,809) 6,252
Transfer of HTM securities to AFS securities 0    
Cumulative effects from adoption of new accounting standards (46)    
Other comprehensive income (loss) before reclassification (9,624)    
Amounts reclassified from accumulated other comprehensive income 281    
Other comprehensive income (loss) (9,343) 2,925 (10,061)
Ending balance $ (10,273) $ (884) $ (3,809)