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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Schedule of Maturity of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available for sale, Amortized Cost
Within 1 year	$ 15,204
Over 1 year to 5 years	31,179
Over 5 years to 10 years	71,721
Over 10 years	153,621
Total bonds and obligations	271,725
Mortgage-backed securities	1,125,997
Amortized Cost	1,397,722	$ 1,421,273
Available for sale, Fair Value
Within 1 year	15,245
Over 1 year to 5 years	31,213
Over 5 years to 10 years	72,831
Over 10 years	158,918
Total bonds and obligations	278,207
Mortgage-backed securities	1,131,871
Fair Value	1,410,078	1,399,647
Held to maturity, Amortized Cost
Within 1 year	2,875
Over 1 year to 5 years	14,729
Over 5 years to 10 years	15,086
Over 10 years	243,904
Total bonds and obligations	276,594
Mortgage-backed securities	87,869
Amortized Cost	364,463	373,763
Held to maturity, Fair Value
Within 1 year	2,875
Over 1 year to 5 years	14,844
Over 5 years to 10 years	15,180
Over 10 years	253,439
Total bonds and obligations	286,338
Mortgage-backed securities	90,718
Fair Value	$ 377,056	$ 371,224

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