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LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Credit quality information
Total Loans	$ 8,376,417	$ 8,299,338
Special mention
Credit quality information
Total Loans	52,477	55,189
Substandard
Credit quality information
Total Loans	121,193	110,258
Non Accrual
Credit quality information
Total Loans	29,287	22,899
Classified
Credit quality information
Total Loans	150,480	133,157
Criticized
Credit quality information
Total Loans	202,957	188,346
Commercial Real Estate
Credit quality information
Total Loans	3,266,737	3,264,742
Commercial Real Estate | Construction
Credit quality information
Total Loans	347,303	354,171
Commercial Real Estate | Single and multi-family
Credit quality information
Total Loans	542,220	423,165
Commercial Real Estate | Other
Credit quality information
Total Loans	2,377,214	2,487,406
Commercial and industrial loans | Other
Credit quality information
Total Loans	1,818,974	1,803,939
Residential Mortgages
Credit quality information
Total Loans	2,181,807	2,102,807
Residential Mortgages | Construction
Credit quality information
Total Loans	6,325	5,410
Residential Mortgages | 1-4 family
Credit quality information
Total Loans	2,175,482	2,097,397
Consumer Loans
Credit quality information
Total Loans	1,108,899	1,127,850
Consumer Loans | Home equity
Credit quality information
Total Loans	400,113	410,181
Consumer Loans | Auto and other
Credit quality information
Total Loans	708,786	717,669
Business Activities Loans
Credit quality information
Total Loans	6,282,678	6,112,198
Business Activities Loans | Special mention
Credit quality information
Total Loans	34,267	28,387
Business Activities Loans | Substandard
Credit quality information
Total Loans	39,344	36,846
Business Activities Loans | Non Accrual
Credit quality information
Total Loans	18,121	15,659
Business Activities Loans | Classified
Credit quality information
Total Loans	57,465	52,505
Business Activities Loans | Criticized
Credit quality information
Total Loans	91,732	80,892
Business Activities Loans | Commercial Real Estate
Credit quality information
Total Loans	2,281,503	2,217,707
Business Activities Loans | Commercial Real Estate | Pass
Credit quality information
Total Loans	2,225,581	2,170,751
Business Activities Loans | Commercial Real Estate | Special mention
Credit quality information
Total Loans	49,973	13,503
Business Activities Loans | Commercial Real Estate | Substandard
Credit quality information
Total Loans	5,949	33,453
Business Activities Loans | Commercial Real Estate | Construction
Credit quality information
Total Loans	255,835	269,206
Business Activities Loans | Commercial Real Estate | Construction | Pass
Credit quality information
Total Loans	255,835	269,206
Business Activities Loans | Commercial Real Estate | Construction | Special mention
Credit quality information
Total Loans	0	0
Business Activities Loans | Commercial Real Estate | Construction | Substandard
Credit quality information
Total Loans	0	0
Business Activities Loans | Commercial Real Estate | Single and multi-family
Credit quality information
Total Loans	345,180	217,083
Business Activities Loans | Commercial Real Estate | Single and multi-family | Pass
Credit quality information
Total Loans	342,683	214,289
Business Activities Loans | Commercial Real Estate | Single and multi-family | Special mention
Credit quality information
Total Loans	2,064	504
Business Activities Loans | Commercial Real Estate | Single and multi-family | Substandard
Credit quality information
Total Loans	433	2,290
Business Activities Loans | Commercial Real Estate | Other
Credit quality information
Total Loans	1,680,488	1,731,418
Business Activities Loans | Commercial Real Estate | Other | Pass
Credit quality information
Total Loans	1,627,063	1,687,256
Business Activities Loans | Commercial Real Estate | Other | Special mention
Credit quality information
Total Loans	47,909	12,999
Business Activities Loans | Commercial Real Estate | Other | Substandard
Credit quality information
Total Loans	5,516	31,163
Business Activities Loans | Commercial and industrial loans
Credit quality information
Total Loans	1,195,642	1,182,569
Business Activities Loans | Commercial and industrial loans | Other
Credit quality information
Total Loans	1,195,642	1,182,569
Business Activities Loans | Commercial and industrial loans | Commercial Loan
Credit quality information
Total Loans	1,195,642	1,182,569
Business Activities Loans | Commercial and industrial loans | Commercial Loan | Pass
Credit quality information
Total Loans	1,168,102	1,156,240
Business Activities Loans | Commercial and industrial loans | Commercial Loan | Special mention
Credit quality information
Total Loans	21,668	12,806
Business Activities Loans | Commercial and industrial loans | Commercial Loan | Substandard
Credit quality information
Total Loans	3,517	11,123
Business Activities Loans | Commercial and industrial loans | Commercial Loan | Doubtful
Credit quality information
Total Loans	2,355	2,400
Business Activities Loans | Residential Mortgages
Credit quality information
Total Loans	1,906,713	1,813,201
Business Activities Loans | Residential Mortgages | Construction
Credit quality information
Total Loans	6,121	5,177
Business Activities Loans | Residential Mortgages | 1-4 family
Credit quality information
Total Loans	1,900,592	1,808,024
Business Activities Loans | Residential Mortgages | Mortgages
Credit quality information
Total Loans	1,906,713	1,813,201
Business Activities Loans | Residential Mortgages | Mortgages | Pass
Credit quality information
Total Loans	1,903,705	1,810,773
Business Activities Loans | Residential Mortgages | Mortgages | Special mention
Credit quality information
Total Loans	968	242
Business Activities Loans | Residential Mortgages | Mortgages | Substandard
Credit quality information
Total Loans	2,040	2,186
Business Activities Loans | Residential Mortgages | Mortgages | Construction
Credit quality information
Total Loans	6,121	5,177
Business Activities Loans | Residential Mortgages | Mortgages | Construction | Pass
Credit quality information
Total Loans	6,121	5,177
Business Activities Loans | Residential Mortgages | Mortgages | Construction | Special mention
Credit quality information
Total Loans	0	0
Business Activities Loans | Residential Mortgages | Mortgages | Construction | Substandard
Credit quality information
Total Loans	0	0
Business Activities Loans | Residential Mortgages | Mortgages | 1-4 family
Credit quality information
Total Loans	1,900,592	1,808,024
Business Activities Loans | Residential Mortgages | Mortgages | 1-4 family | Pass
Credit quality information
Total Loans	1,897,584	1,805,596
Business Activities Loans | Residential Mortgages | Mortgages | 1-4 family | Special mention
Credit quality information
Total Loans	968	242
Business Activities Loans | Residential Mortgages | Mortgages | 1-4 family | Substandard
Credit quality information
Total Loans	2,040	2,186
Business Activities Loans | Consumer Loans
Credit quality information
Total Loans	898,820	898,721
Business Activities Loans | Consumer Loans | Performing
Credit quality information
Total Loans	894,560	895,640
Business Activities Loans | Consumer Loans | Nonperforming
Credit quality information
Total Loans	4,260	3,081
Business Activities Loans | Consumer Loans | Home equity
Credit quality information
Total Loans	291,094	294,954
Business Activities Loans | Consumer Loans | Home equity | Performing
Credit quality information
Total Loans	288,496	293,327
Business Activities Loans | Consumer Loans | Home equity | Nonperforming
Credit quality information
Total Loans	2,598	1,627
Business Activities Loans | Consumer Loans | Auto and other
Credit quality information
Total Loans	607,726	603,767
Business Activities Loans | Consumer Loans | Auto and other | Performing
Credit quality information
Total Loans	606,064	602,313
Business Activities Loans | Consumer Loans | Auto and other | Nonperforming
Credit quality information
Total Loans	1,662	1,454
Acquired Loans
Credit quality information
Total Loans	2,093,739	2,187,140
Acquired Loans | Special mention
Credit quality information
Total Loans	18,210	26,802
Acquired Loans | Substandard
Credit quality information
Total Loans	81,849	73,412
Acquired Loans | Non Accrual
Credit quality information
Total Loans	11,166	7,240
Acquired Loans | Classified
Credit quality information
Total Loans	93,015	80,652
Acquired Loans | Criticized
Credit quality information
Total Loans	111,225	107,454
Acquired Loans | Commercial Real Estate
Credit quality information
Total Loans	985,234	1,047,035
Acquired Loans | Commercial Real Estate | Pass
Credit quality information
Total Loans	902,994	965,081
Acquired Loans | Commercial Real Estate | Special mention
Credit quality information
Total Loans	78,104	22,673
Acquired Loans | Commercial Real Estate | Substandard
Credit quality information
Total Loans	4,136	59,281
Acquired Loans | Commercial Real Estate | Construction
Credit quality information
Total Loans	91,468	84,965
Acquired Loans | Commercial Real Estate | Construction | Pass
Credit quality information
Total Loans	83,117	76,611
Acquired Loans | Commercial Real Estate | Construction | Special mention
Credit quality information
Total Loans	8,351	0
Acquired Loans | Commercial Real Estate | Construction | Substandard
Credit quality information
Total Loans	0	8,354
Acquired Loans | Commercial Real Estate | Single and multi-family
Credit quality information
Total Loans	197,040	206,082
Acquired Loans | Commercial Real Estate | Single and multi-family | Pass
Credit quality information
Total Loans	191,691	203,624
Acquired Loans | Commercial Real Estate | Single and multi-family | Special mention
Credit quality information
Total Loans	5,121	603
Acquired Loans | Commercial Real Estate | Single and multi-family | Substandard
Credit quality information
Total Loans	228	1,855
Acquired Loans | Commercial Real Estate | Other
Credit quality information
Total Loans	696,726	755,988
Acquired Loans | Commercial Real Estate | Other | Pass
Credit quality information
Total Loans	628,186	684,846
Acquired Loans | Commercial Real Estate | Other | Special mention
Credit quality information
Total Loans	64,632	22,070
Acquired Loans | Commercial Real Estate | Other | Substandard
Credit quality information
Total Loans	3,908	49,072
Acquired Loans | Commercial and industrial loans
Credit quality information
Total Loans	623,332	621,370
Acquired Loans | Commercial and industrial loans | Other
Credit quality information
Total Loans	623,332	621,370
Acquired Loans | Commercial and industrial loans | Commercial Loan
Credit quality information
Total Loans	623,332	621,370
Acquired Loans | Commercial and industrial loans | Commercial Loan | Pass
Credit quality information
Total Loans	604,890	606,922
Acquired Loans | Commercial and industrial loans | Commercial Loan | Special mention
Credit quality information
Total Loans	16,884	1,241
Acquired Loans | Commercial and industrial loans | Commercial Loan | Substandard
Credit quality information
Total Loans	1,558	13,207
Acquired Loans | Residential Mortgages
Credit quality information
Total Loans	275,094	289,606
Acquired Loans | Residential Mortgages | Construction
Credit quality information
Total Loans	204	233
Acquired Loans | Residential Mortgages | 1-4 family
Credit quality information
Total Loans	274,890	289,373
Acquired Loans | Residential Mortgages | Mortgages
Credit quality information
Total Loans	275,094	289,606
Acquired Loans | Residential Mortgages | Mortgages | Pass
Credit quality information
Total Loans	266,718	281,393
Acquired Loans | Residential Mortgages | Mortgages | Special mention
Credit quality information
Total Loans	4,640	2,704
Acquired Loans | Residential Mortgages | Mortgages | Substandard
Credit quality information
Total Loans	3,736	5,509
Acquired Loans | Residential Mortgages | Mortgages | Construction
Credit quality information
Total Loans	204	233
Acquired Loans | Residential Mortgages | Mortgages | Construction | Pass
Credit quality information
Total Loans	204	233
Acquired Loans | Residential Mortgages | Mortgages | Construction | Special mention
Credit quality information
Total Loans	0	0
Acquired Loans | Residential Mortgages | Mortgages | Construction | Substandard
Credit quality information
Total Loans	0	0
Acquired Loans | Residential Mortgages | Mortgages | 1-4 family
Credit quality information
Total Loans	274,890	289,373
Acquired Loans | Residential Mortgages | Mortgages | 1-4 family | Pass
Credit quality information
Total Loans	266,514	281,160
Acquired Loans | Residential Mortgages | Mortgages | 1-4 family | Special mention
Credit quality information
Total Loans	4,640	2,704
Acquired Loans | Residential Mortgages | Mortgages | 1-4 family | Substandard
Credit quality information
Total Loans	3,736	5,509
Acquired Loans | Consumer Loans
Credit quality information
Total Loans	210,079	229,129
Acquired Loans | Consumer Loans | Performing
Credit quality information
Total Loans	208,343	226,772
Acquired Loans | Consumer Loans | Nonperforming
Credit quality information
Total Loans	1,736	2,357
Acquired Loans | Consumer Loans | Home equity
Credit quality information
Total Loans	109,019	115,227
Acquired Loans | Consumer Loans | Home equity | Performing
Credit quality information
Total Loans	107,768	113,262
Acquired Loans | Consumer Loans | Home equity | Nonperforming
Credit quality information
Total Loans	1,251	1,965
Acquired Loans | Consumer Loans | Auto and other
Credit quality information
Total Loans	101,060	113,902
Acquired Loans | Consumer Loans | Auto and other | Performing
Credit quality information
Total Loans	100,575	113,510
Acquired Loans | Consumer Loans | Auto and other | Nonperforming
Credit quality information
Total Loans	$ 485	$ 392

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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