SECURITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available for sale:
Amortized Cost	$ 808,168	$ 592,667
Gross Unrealized Gains	1,193	1,371
Gross Unrealized Losses	(9,158)	(6,854)
Estimated Fair Value	800,203	587,184
Held to maturity:
Held-to-maturity Securities	208,351	214,927
Gross Unrealized Gains	2,867	2,939
Gross Unrealized Losses	(1,215)	(1,577)
Estimated Fair Value	210,003	216,289
Total securities
Amortized Cost	1,016,519	807,594
Gross Unrealized Gains	4,060	4,310
Gross Unrealized Losses	(10,373)	(8,431)
Investments, Fair Value Disclosure	1,010,206	803,473
U.S. GSE securities
Available for sale:
Amortized Cost	$ 63,238	97,560
Gross Unrealized Gains		4
Gross Unrealized Losses	$ (564)	(2,139)
Estimated Fair Value	62,674	95,425
Held to maturity:
Held-to-maturity Securities	7,466	11,283
Gross Unrealized Gains	$ 1	135
Gross Unrealized Losses		(41)
Estimated Fair Value	$ 7,467	11,377
State and municipal obligations
Available for sale:
Amortized Cost	87,830	63,583
Gross Unrealized Gains	427	318
Gross Unrealized Losses	(322)	(208)
Estimated Fair Value	87,935	63,693
Held to maturity:
Held-to-maturity Securities	64,878	64,864
Gross Unrealized Gains	1,715	1,658
Gross Unrealized Losses	(113)	(98)
Estimated Fair Value	66,480	66,424
U.S. GSE residential mortgage-backed securities
Available for sale:
Amortized Cost	201,297	100,931
Gross Unrealized Gains	237	534
Gross Unrealized Losses	(1,270)	(40)
Estimated Fair Value	200,264	101,425
Held to maturity:
Held-to-maturity Securities	$ 7,609	$ 6,667
Gross Unrealized Gains
Gross Unrealized Losses	$ (106)	$ (97)
Estimated Fair Value	22,953	6,570
U.S. GSE Residential collateralized mortgage Obligations
Available for sale:
Amortized Cost	321,253	261,256
Gross Unrealized Gains	513	310
Gross Unrealized Losses	(3,888)	(2,967)
Estimated Fair Value	317,878	258,599
Held to maturity:
Held-to-maturity Securities	60,933	59,539
Gross Unrealized Gains	617	507
Gross Unrealized Losses	(498)	(862)
Estimated Fair Value	61,052	59,184
U.S. GSE commercial mortgage-backed securities
Available for sale:
Amortized Cost	12,491	$ 3,016
Gross Unrealized Gains	7
Gross Unrealized Losses	(80)	$ (71)
Estimated Fair Value	12,418	2,945
Held to maturity:
Held-to-maturity Securities	23,056	13,213
Gross Unrealized Gains	210	233
Gross Unrealized Losses	(313)	(26)
Estimated Fair Value	22,953	13,420
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Amortized Cost	64,809	24,179
Gross Unrealized Gains	9	44
Gross Unrealized Losses	(620)	(141)
Estimated Fair Value	64,198	24,082
Held to maturity:
Held-to-maturity Securities	33,409	36,413
Gross Unrealized Gains	282	267
Gross Unrealized Losses	(185)	(431)
Estimated Fair Value	33,506	36,249
Other asset backed securities
Available for sale:
Amortized Cost	$ 24,250	$ 24,190
Gross Unrealized Gains
Gross Unrealized Losses	$ (1,879)	$ (1,153)
Estimated Fair Value	22,371	23,037
Corporate bonds
Available for sale:
Amortized Cost	$ 33,000	17,952
Gross Unrealized Gains		161
Gross Unrealized Losses	$ (535)	(135)
Estimated Fair Value	32,465	17,978
Held to maturity:
Held-to-maturity Securities	11,000	22,948
Gross Unrealized Gains	$ 42	139
Gross Unrealized Losses		(22)
Estimated Fair Value	$ 11,042	$ 23,065