SECURITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available for sale:
Amortized Cost	$ 623,032	$ 808,168
Gross Unrealized Gains	6,883	1,193
Gross Unrealized Losses	(2,832)	(9,158)
Estimated Fair Value	627,083	800,203
Held to maturity:
Amortized Cost	222,058	208,351
Gross Unrealized Gains	7,253	2,867
Gross Unrealized Losses	(137)	(1,215)
Estimated Fair Value	229,174	210,003
Total securities
Amortized Cost	845,090	1,016,519
Gross Unrealized Gains	14,136	4,060
Gross Unrealized Losses	(2,969)	(10,373)
Total securities	856,257	1,010,206
U.S. GSE securities
Available for sale:
Amortized Cost	58,242	63,238
Gross Unrealized Gains	84
Gross Unrealized Losses	(1)	(564)
Estimated Fair Value	58,325	62,674
Held to maturity:
Amortized Cost		7,466
Gross Unrealized Gains		1
Gross Unrealized Losses
Estimated Fair Value		7,467
State and municipal obligations
Available for sale:
Amortized Cost	108,184	87,830
Gross Unrealized Gains	2,400	427
Gross Unrealized Losses	(28)	(322)
Estimated Fair Value	110,556	87,935
Held to maturity:
Amortized Cost	61,159	64,878
Gross Unrealized Gains	3,294	1,715
Gross Unrealized Losses		(113)
Estimated Fair Value	64,453	66,480
U.S. GSE residential mortgage-backed securities
Available for sale:
Amortized Cost	100,685	201,297
Gross Unrealized Gains	1,393	237
Gross Unrealized Losses	(4)	(1,270)
Estimated Fair Value	102,074	200,264
Held to maturity:
Amortized Cost	11,837	7,609
Gross Unrealized Gains	107
Gross Unrealized Losses		(106)
Estimated Fair Value	11,944	7,503
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Amortized Cost	236,771	321,253
Gross Unrealized Gains	1,962	513
Gross Unrealized Losses	(135)	(3,888)
Estimated Fair Value	238,598	317,878
Held to maturity:
Amortized Cost	66,219	60,933
Gross Unrealized Gains	1,937	617
Gross Unrealized Losses	(33)	(498)
Estimated Fair Value	68,123	61,052
U.S. GSE commercial mortgage-backed securities
Available for sale:
Amortized Cost	6,488	12,491
Gross Unrealized Gains	213	7
Gross Unrealized Losses		(80)
Estimated Fair Value	6,701	12,418
Held to maturity:
Amortized Cost	29,119	23,056
Gross Unrealized Gains	912	210
Gross Unrealized Losses	(53)	(313)
Estimated Fair Value	29,978	22,953
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Amortized Cost	56,412	64,809
Gross Unrealized Gains	546	9
Gross Unrealized Losses	(47)	(620)
Estimated Fair Value	56,911	64,198
Held to maturity:
Amortized Cost	42,724	33,409
Gross Unrealized Gains	974	282
Gross Unrealized Losses	(51)	(185)
Estimated Fair Value	43,647	33,506
Other asset backed securities
Available for sale:
Amortized Cost	24,250	24,250
Gross Unrealized Gains
Gross Unrealized Losses	(1,940)	(1,879)
Estimated Fair Value	22,310	22,371
Corporate bonds
Available for sale:
Amortized Cost	32,000	33,000
Gross Unrealized Gains	285
Gross Unrealized Losses	(677)	(535)
Estimated Fair Value	31,608	32,465
Held to maturity:
Amortized Cost	11,000	11,000
Gross Unrealized Gains	29	42
Gross Unrealized Losses
Estimated Fair Value	$ 11,029	$ 11,042