INVESTMENT SECURITIES - Summary of Unrealized Losses - Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	$ 165,890	$ 29,437
Securities with losses under 12 months, Gross Unrealized Loss	1,471	158
Securities with losses over 12 months, Fair Value	32,975	68,536
Securities with losses over 12 months, Gross Unrealized Loss	1,134	1,917
Total, Fair Value	198,865	97,973
Total, Gross Unrealized Loss	2,605	2,075
U.S. Government sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value		4,973
Securities with losses under 12 months, Gross Unrealized Loss		32
Securities with losses over 12 months, Fair Value		5,254
Securities with losses over 12 months, Gross Unrealized Loss		80
Total, Fair Value		10,227
Total, Gross Unrealized Loss		112
Obligations of state and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	1,192	2,029
Securities with losses under 12 months, Gross Unrealized Loss	27	29
Securities with losses over 12 months, Fair Value	0	0
Securities with losses over 12 months, Gross Unrealized Loss	0	0
Total, Fair Value	1,192	2,029
Total, Gross Unrealized Loss	27	29
GSE mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	21,607	6,668
Securities with losses under 12 months, Gross Unrealized Loss	229	25
Securities with losses over 12 months, Fair Value	0	21,538
Securities with losses over 12 months, Gross Unrealized Loss	0	263
Total, Fair Value	21,607	28,206
Total, Gross Unrealized Loss	229	288
Collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	140,999	9,366
Securities with losses under 12 months, Gross Unrealized Loss	1,207	53
Securities with losses over 12 months, Fair Value	30,029	37,997
Securities with losses over 12 months, Gross Unrealized Loss	1,069	1,467
Total, Fair Value	171,028	47,363
Total, Gross Unrealized Loss	2,276	1,520
Collateralized mortgage obligations: commercial
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	0	0
Securities with losses under 12 months, Gross Unrealized Loss	0	0
Securities with losses over 12 months, Fair Value	2,946	3,747
Securities with losses over 12 months, Gross Unrealized Loss	65	107
Total, Fair Value	2,946	3,747
Total, Gross Unrealized Loss	65	107
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value	2,092
Securities with losses under 12 months, Gross Unrealized Loss	8
Securities with losses over 12 months, Fair Value	0
Securities with losses over 12 months, Gross Unrealized Loss	0
Total, Fair Value	2,092
Total, Gross Unrealized Loss	$ 8
Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities with losses under 12 months, Fair Value		6,401
Securities with losses under 12 months, Gross Unrealized Loss		19
Securities with losses over 12 months, Fair Value		0
Securities with losses over 12 months, Gross Unrealized Loss		0
Total, Fair Value		6,401
Total, Gross Unrealized Loss		$ 19