SECURITIES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Available for sale:
Within one year	$ 5,801
One to five years	86,236
Five to ten years	119,168
Beyond ten years	588,998
Estimated Fair Value	800,203	$ 587,184
Amortized Cost, Available for sale:
Within one year	5,785
One to five years	86,611
Five to ten years	119,949
Beyond ten years	595,823
Total	808,168	592,667
Fair Value, Held to maturity:
Within one year	4,864
One to five years	40,015
Five to ten years	55,319
Beyond ten years	109,805
Estimated Fair Value	210,003	216,289
Amortized Cost, Held to maturity:
Within one year	4,859
One to five years	39,930
Five to ten years	53,951
Beyond ten years	109,611
Total	208,351	214,927
Fair Value, Total securities
Within One Year	10,665
After One But Within Five Years	126,251
After Five But Within Ten Years	174,487
After Ten Years	698,803
Total securities	1,010,206	803,473
Amortized Cost, Total securities
Within One Year	10,644
After One But Within Five Years	126,541
After Five But Within Ten	173,900
After Ten Years	705,434
Amortized Cost	$ 1,016,519	807,594
U.S. GSE securities
Fair Value, Available for sale:
Within one year
One to five years	$ 33,747
Five to ten years	$ 28,927
Beyond ten years
Estimated Fair Value	$ 62,674	95,425
Amortized Cost, Available for sale:
Within one year
One to five years	$ 33,990
Five to ten years	$ 29,248
Beyond ten years
Total	$ 63,238	97,560
Fair Value, Held to maturity:
Within one year
One to five years	$ 7,467
Five to ten years
Beyond ten years
Estimated Fair Value	$ 7,467	11,377
Amortized Cost, Held to maturity:
Within one year
One to five years	$ 7,466
Five to ten years
Beyond ten years
Total	$ 7,466	11,283
State and municipal obligations
Fair Value, Available for sale:
Within one year	4,801
One to five years	46,591
Five to ten years	27,692
Beyond ten years	8,851
Estimated Fair Value	87,935	63,693
Amortized Cost, Available for sale:
Within one year	4,785
One to five years	46,696
Five to ten years	27,478
Beyond ten years	8,871
Total	87,830	63,583
Fair Value, Held to maturity:
Within one year	4,864
One to five years	16,474
Five to ten years	39,098
Beyond ten years	6,044
Estimated Fair Value	66,480	66,424
Amortized Cost, Held to maturity:
Within one year	4,859
One to five years	16,384
Five to ten years	37,616
Beyond ten years	6,019
Total	$ 64,878	64,864
U.S. GSE residential mortgage-backed securities
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	$ 14,369
Beyond ten years	185,895
Estimated Fair Value	$ 200,264	101,425
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	$ 14,441
Beyond ten years	186,856
Total	$ 201,297	100,931
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years
Beyond ten years	$ 7,503
Estimated Fair Value	$ 22,953	6,570
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years	$ 7,609
Beyond ten years	7,609
Total	$ 7,609	6,667
U.S. GSE residential collateralized mortgage obligations
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	$ 4,227
Beyond ten years	313,651
Estimated Fair Value	$ 317,878	258,599
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	$ 4,242
Beyond ten years	317,011
Total	$ 321,253	261,256
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years	$ 1,536
Beyond ten years	59,516
Estimated Fair Value	$ 61,052	59,184
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years	$ 1,494
Beyond ten years	59,439
Total	$ 60,933	59,539
U.S. GSE commercial mortgage-backed securities
Fair Value, Available for sale:
Within one year
One to five years	$ 5,898
Five to ten years	$ 6,520
Beyond ten years
Estimated Fair Value	$ 12,418	2,945
Amortized Cost, Available for sale:
Within one year
One to five years	$ 5,925
Five to ten years	$ 6,566
Beyond ten years
Total	$ 12,491	3,016
Fair Value, Held to maturity:
Within one year
One to five years	$ 5,032
Five to ten years	14,685
Beyond ten years	3,236
Estimated Fair Value	$ 22,953	13,420
Amortized Cost, Held to maturity:
Within one year
One to five years	$ 5,080
Five to ten years	14,841
Beyond ten years	3,135
Total	$ 23,056	13,213
U.S. GSE commercial collateralized mortgage obligations
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years	$ 5,968
Beyond ten years	58,230
Estimated Fair Value	$ 64,198	24,082
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years	$ 5,974
Beyond ten years	58,835
Total	$ 64,809	24,179
Fair Value, Held to maturity:
Within one year
One to five years
Five to ten years
Beyond ten years	$ 33,506
Estimated Fair Value	$ 33,506	36,249
Amortized Cost, Held to maturity:
Within one year
One to five years
Five to ten years
Beyond ten years	$ 33,409
Total	$ 33,409	36,413
Other asset backed securities
Fair Value, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	$ 22,371
Estimated Fair Value	$ 22,371	23,037
Amortized Cost, Available for sale:
Within one year
One to five years
Five to ten years
Beyond ten years	$ 24,250
Total	24,250	24,190
Corporate bonds
Fair Value, Available for sale:
Within one year	$ 1,000
One to five years
Five to ten years	$ 31,465
Beyond ten years
Estimated Fair Value	$ 32,465	17,978
Amortized Cost, Available for sale:
Within one year	$ 1,000
One to five years
Five to ten years	$ 32,000
Beyond ten years
Total	$ 33,000	17,952
Fair Value, Held to maturity:
Within one year
One to five years	$ 11,042
Five to ten years
Beyond ten years
Estimated Fair Value	$ 11,042	23,065
Amortized Cost, Held to maturity:
Within one year
One to five years	$ 11,000
Five to ten years
Beyond ten years
Total	$ 11,000	$ 22,948