SECURITIES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Available for sale:
Within one year	$ 14,635
One to five years	77,557
Five to ten years	141,968
Beyond ten years	585,562
Estimated Fair Value	819,722	$ 800,203
Amortized Cost, Available for sale:
Within one year	14,638
One to five years	78,467
Five to ten years	145,385
Beyond ten years	596,074
Total	834,564	808,168
Fair Value, Held to maturity:
Within one year	20,657
One to five years	21,998
Five to ten years	67,708
Beyond ten years	112,515
Estimated Fair Value	222,878	210,003
Amortized Cost, Held to maturity:
Within one year	20,635
One to five years	21,881
Five to ten years	67,206
Beyond ten years	113,515
Total	223,237	208,351
Fair Value, Total securities
Within One Year	35,292
After One But Within Five Years	99,555
After Five But Within Ten Years	209,676
After Ten Years	698,077
Total securities	1,042,600	1,010,206
Amortized Cost, Total securities
Within One Year	35,273
After One But Within Five Years	100,348
After Five But Within Ten	212,591
After Ten Years	709,589
Amortized Cost	1,057,801	1,016,519
U.S. GSE securities
Fair Value, Available for sale:
Within one year
One to five years	26,593
Five to ten years	37,056
Beyond ten years
Estimated Fair Value	63,649	62,674
Amortized Cost, Available for sale:
Within one year
One to five years	26,994
Five to ten years	37,999
Beyond ten years
Total	64,993	63,238
Fair Value, Held to maturity:
Estimated Fair Value		7,467
Amortized Cost, Held to maturity:
Total		7,466
State and municipal obligations
Fair Value, Available for sale:
Within one year	14,635
One to five years	50,964
Five to ten years	42,921
Beyond ten years	7,645
Estimated Fair Value	116,165	87,935
Amortized Cost, Available for sale:
Within one year	14,638
One to five years	51,473
Five to ten years	43,461
Beyond ten years	7,720
Total	117,292	87,830
Fair Value, Held to maturity:
Within one year	9,631
One to five years	16,982
Five to ten years	39,133
Beyond ten years	1,875
Estimated Fair Value	67,621	66,480
Amortized Cost, Held to maturity:
Within one year	9,635
One to five years	16,818
Five to ten years	38,361
Beyond ten years	1,852
Total	66,666	64,878
U.S. GSE residential mortgage-backed securities
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	16,124
Beyond ten years	141,924
Estimated Fair Value	158,048	200,264
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	16,227
Beyond ten years	144,219
Total	160,446	201,297
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years	1,688
Beyond ten years	11,468
Estimated Fair Value	13,156	7,503
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years	1,701
Beyond ten years	11,742
Total	13,443	7,609
U.S. GSE residential collateralized mortgage Obligations
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	9,263
Beyond ten years	358,248
Estimated Fair Value	367,511	317,878
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	9,361
Beyond ten years	363,737
Total	373,098	321,253
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years	7,389
Beyond ten years	54,050
Estimated Fair Value	61,439	61,052
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years	7,394
Beyond ten years	54,245
Total	61,639	60,933
U.S. GSE commercial mortgage-backed securities
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	6,307
Beyond ten years
Estimated Fair Value	6,307	12,418
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	6,337
Beyond ten years
Total	6,337	12,491
Fair Value, Held to maturity:
Within one year
One to five years	5,016
Five to ten years	14,568
Beyond ten years	8,815
Estimated Fair Value	28,399	22,953
Amortized Cost, Held to maturity:
Within one year
One to five years	5,063
Five to ten years	14,621
Beyond ten years	9,088
Total	28,772	23,056
U.S. GSE commercial collateralized mortgage Obligations
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	55,192
Estimated Fair Value	55,192	64,198
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	56,148
Total	56,148	64,809
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years	4,930
Beyond ten years	36,307
Estimated Fair Value	41,237	33,506
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years	5,129
Beyond ten years	36,588
Total	41,717	33,409
Other asset backed securities
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	22,553
Estimated Fair Value	22,553	22,371
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	24,250
Total	24,250	24,250
Corporate bonds
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	30,297
Beyond ten years
Estimated Fair Value	30,297	32,465
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	32,000
Beyond ten years
Total	32,000	33,000
Fair Value, Held to maturity:
Within one year	11,026
One to five years
Five to ten years
Beyond ten years
Estimated Fair Value	11,026	11,042
Amortized Cost, Held to maturity:
Within one year	11,000
One to five years
Five to ten years
Beyond ten years
Total	$ 11,000	$ 11,000