SECURITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available for sale:
Amortized Cost	$ 637,731	$ 592,667
Gross Unrealized Gains	3,776	1,371
Gross Unrealized Losses	(4,037)	(6,854)
Estimated Fair Value	637,470	587,184
Held to maturity:
Amortized Cost	220,233	214,927
Gross Unrealized Gains	4,555	2,939
Gross Unrealized Losses	(501)	(1,577)
Estimated Fair Value	224,287	216,289
Total securities
Amortized Cost	857,964	807,594
Gross Unrealized Gains	8,331	4,310
Gross Unrealized Losses	(4,538)	(8,431)
Total securities	861,757	803,473
U.S. GSE securities
Available for sale:
Amortized Cost	67,868	97,560
Gross Unrealized Gains	145	4
Gross Unrealized Losses	(71)	(2,139)
Estimated Fair Value	67,942	95,425
Held to maturity:
Amortized Cost	11,306	11,283
Gross Unrealized Gains	$ 202	135
Gross Unrealized Losses		(41)
Estimated Fair Value	$ 11,508	11,377
State and municipal obligations
Available for sale:
Amortized Cost	86,351	63,583
Gross Unrealized Gains	775	318
Gross Unrealized Losses	(29)	(208)
Estimated Fair Value	87,097	63,693
Held to maturity:
Amortized Cost	64,220	64,864
Gross Unrealized Gains	2,085	1,658
Gross Unrealized Losses	(56)	(98)
Estimated Fair Value	66,249	66,424
U.S. GSE residential mortgage-backed securities
Available for sale:
Amortized Cost	154,546	100,931
Gross Unrealized Gains	1,093	534
Gross Unrealized Losses	(123)	(40)
Estimated Fair Value	155,516	101,425
Held to maturity:
Amortized Cost	7,932	$ 6,667
Gross Unrealized Gains	5
Gross Unrealized Losses	(45)	$ (97)
Estimated Fair Value	7,892	6,570
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Amortized Cost	235,025	261,256
Gross Unrealized Gains	1,456	310
Gross Unrealized Losses	(1,485)	(2,967)
Estimated Fair Value	234,996	258,599
Held to maturity:
Amortized Cost	63,163	59,539
Gross Unrealized Gains	1,066	507
Gross Unrealized Losses	(157)	(862)
Estimated Fair Value	64,072	59,184
U.S. GSE commercial mortgage-backed securities
Available for sale:
Amortized Cost	12,551	$ 3,016
Gross Unrealized Gains	179
Gross Unrealized Losses	(24)	$ (71)
Estimated Fair Value	12,706	2,945
Held to maturity:
Amortized Cost	23,151	13,213
Gross Unrealized Gains	468	233
Gross Unrealized Losses	(119)	(26)
Estimated Fair Value	23,500	13,420
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Amortized Cost	29,185	24,179
Gross Unrealized Gains	124	44
Gross Unrealized Losses	(72)	(141)
Estimated Fair Value	29,237	24,082
Held to maturity:
Amortized Cost	33,466	36,413
Gross Unrealized Gains	668	267
Gross Unrealized Losses	(119)	(431)
Estimated Fair Value	34,015	36,249
Other asset backed securities
Available for sale:
Amortized Cost	$ 24,247	$ 24,190
Gross Unrealized Gains
Gross Unrealized Losses	$ (1,937)	$ (1,153)
Estimated Fair Value	22,310	23,037
Corporate bonds
Available for sale:
Amortized Cost	27,958	17,952
Gross Unrealized Gains	4	161
Gross Unrealized Losses	(296)	(135)
Estimated Fair Value	27,666	17,978
Held to maturity:
Amortized Cost	16,995	22,948
Gross Unrealized Gains	61	139
Gross Unrealized Losses	(5)	(22)
Estimated Fair Value	$ 17,051	$ 23,065