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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 8,376,417	$ 8,299,338
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,266,737	3,264,742
Commercial Real Estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	347,303	354,171
Commercial Real Estate | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	542,220	423,165
Commercial Real Estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,377,214	2,487,406
Commercial and industrial loans | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,818,974	1,803,939
Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,181,807	2,102,807
Residential Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,325	5,410
Residential Mortgages | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,175,482	2,097,397
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,108,899	1,127,850
Consumer Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	400,113	410,181
Consumer Loans | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	708,786	717,669
Business Activities Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	43,111	33,264
Current	6,239,567	6,078,934
Total loans	6,282,678	6,112,198
Past Due 90 days and Accruing	712	1,368
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,361	12,201
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17,917	4,036
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18,833	17,027
Business Activities Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23,001	7,447
Current	2,258,502	2,210,260
Total loans	2,281,503	2,217,707
Past Due 90 days and Accruing	74	457
Business Activities Loans | Commercial Real Estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	255,835	269,206
Total loans	255,835	269,206
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial Real Estate | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	443	451
Current	344,737	216,632
Total loans	345,180	217,083
Past Due 90 days and Accruing	10	0
Business Activities Loans | Commercial Real Estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,558	6,996
Current	1,657,930	1,724,422
Total loans	1,680,488	1,731,418
Past Due 90 days and Accruing	64	457
Business Activities Loans | Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,673	1,925
Business Activities Loans | Commercial Real Estate | 30-59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate | 30-59 Days Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate | 30-59 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,673	1,925
Business Activities Loans | Commercial Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,305	48
Business Activities Loans | Commercial Real Estate | 60-89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate | 60-89 Days Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate | 60-89 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,305	48
Business Activities Loans | Commercial Real Estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,023	5,474
Business Activities Loans | Commercial Real Estate | 90 Days or Greater Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate | 90 Days or Greater Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	443	451
Business Activities Loans | Commercial Real Estate | 90 Days or Greater Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,580	5,023
Business Activities Loans | Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,643	11,966
Current	1,186,999	1,170,603
Total loans	1,195,642	1,182,569
Past Due 90 days and Accruing	4	128
Business Activities Loans | Commercial and industrial loans | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,195,642	1,182,569
Business Activities Loans | Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,492	4,031
Business Activities Loans | Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,275	1,912
Business Activities Loans | Commercial and industrial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,876	6,023
Business Activities Loans | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,869	4,840
Current	1,902,844	1,808,361
Total loans	1,906,713	1,813,201
Past Due 90 days and Accruing	425	520
Business Activities Loans | Residential Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	6,121	5,177
Total loans	6,121	5,177
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential Mortgages | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,869	4,840
Current	1,896,723	1,803,184
Total loans	1,900,592	1,808,024
Past Due 90 days and Accruing	425	520
Business Activities Loans | Residential Mortgages | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	861	2,412
Business Activities Loans | Residential Mortgages | 30-59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential Mortgages | 30-59 Days Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	861	2,412
Business Activities Loans | Residential Mortgages | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	543	242
Business Activities Loans | Residential Mortgages | 60-89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential Mortgages | 60-89 Days Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	543	242
Business Activities Loans | Residential Mortgages | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,465	2,186
Business Activities Loans | Residential Mortgages | 90 Days or Greater Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential Mortgages | 90 Days or Greater Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,465	2,186
Business Activities Loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,598	9,011
Current	891,222	889,710
Total loans	898,820	898,721
Past Due 90 days and Accruing	209	263
Business Activities Loans | Consumer Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,955	3,426
Current	288,139	291,528
Total loans	291,094	294,954
Past Due 90 days and Accruing	97	120
Business Activities Loans | Consumer Loans | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,643	5,585
Current	603,083	598,182
Total loans	607,726	603,767
Past Due 90 days and Accruing	112	143
Business Activities Loans | Consumer Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,335	3,833
Business Activities Loans | Consumer Loans | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	161	444
Business Activities Loans | Consumer Loans | 30-59 Days Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,174	3,389
Business Activities Loans | Consumer Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	794	1,834
Business Activities Loans | Consumer Loans | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99	1,235
Business Activities Loans | Consumer Loans | 60-89 Days Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	695	599
Business Activities Loans | Consumer Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,469	3,344
Business Activities Loans | Consumer Loans | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,695	1,747
Business Activities Loans | Consumer Loans | 90 Days or Greater Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,774	1,597
Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,379	16,667
Acquired Credit Impaired	93,645	97,344
Total loans	2,093,739	2,187,140
Past Due 90 days and Accruing	1,413	200
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,159	4,328
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	641	4,899
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,579	7,440
Acquired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,596	5,721
Acquired Credit Impaired	47,885	53,302
Total loans	985,234	1,047,035
Past Due 90 days and Accruing	1,050	109
Acquired Loans | Commercial Real Estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	7,651	7,655
Total loans	91,468	84,965
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial Real Estate | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	413	874
Acquired Credit Impaired	2,530	2,846
Total loans	197,040	206,082
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial Real Estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,183	4,847
Acquired Credit Impaired	37,704	42,801
Total loans	696,726	755,988
Past Due 90 days and Accruing	1,050	109
Acquired Loans | Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	410	1,487
Acquired Loans | Commercial Real Estate | 30-59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial Real Estate | 30-59 Days Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	185	671
Acquired Loans | Commercial Real Estate | 30-59 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	225	816
Acquired Loans | Commercial Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,875
Acquired Loans | Commercial Real Estate | 60-89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial Real Estate | 60-89 Days Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial Real Estate | 60-89 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,875
Acquired Loans | Commercial Real Estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,186	2,359
Acquired Loans | Commercial Real Estate | 90 Days or Greater Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial Real Estate | 90 Days or Greater Past Due | Single and multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	228	203
Acquired Loans | Commercial Real Estate | 90 Days or Greater Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,958	2,156
Acquired Loans | Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,835	2,959
Acquired Credit Impaired	36,461	34,629
Total loans	623,332	621,370
Past Due 90 days and Accruing	348	23
Acquired Loans | Commercial and industrial loans | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	623,332	621,370
Acquired Loans | Commercial and industrial loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	822	1,252
Acquired Loans | Commercial and industrial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	107	268
Acquired Loans | Commercial and industrial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,906	1,439
Acquired Loans | Residential Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,566	4,785
Acquired Credit Impaired	6,903	6,974
Total loans	275,094	289,606
Past Due 90 days and Accruing	0	30
Acquired Loans | Residential Mortgages | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	0	0
Total loans	204	233
Past Due 90 days and Accruing	0	0
Acquired Loans | Residential Mortgages | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,566	4,785
Acquired Credit Impaired	6,903	6,974
Total loans	274,890	289,373
Past Due 90 days and Accruing	0	30
Acquired Loans | Residential Mortgages | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	434	957
Acquired Loans | Residential Mortgages | 30-59 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Residential Mortgages | 30-59 Days Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	434	957
Acquired Loans | Residential Mortgages | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	396	2,581
Acquired Loans | Residential Mortgages | 60-89 Days Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Residential Mortgages | 60-89 Days Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	396	2,581
Acquired Loans | Residential Mortgages | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,736	1,247
Acquired Loans | Residential Mortgages | 90 Days or Greater Past Due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Residential Mortgages | 90 Days or Greater Past Due | 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,736	1,247
Acquired Loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,382	3,202
Acquired Credit Impaired	2,396	2,439
Total loans	210,079	229,129
Past Due 90 days and Accruing	15	38
Acquired Loans | Consumer Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,548	2,291
Acquired Credit Impaired	1,965	1,956
Total loans	109,019	115,227
Past Due 90 days and Accruing	0	0
Acquired Loans | Consumer Loans | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	834	911
Acquired Credit Impaired	431	483
Total loans	101,060	113,902
Past Due 90 days and Accruing	15	38
Acquired Loans | Consumer Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	493	632
Acquired Loans | Consumer Loans | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	216	286
Acquired Loans | Consumer Loans | 30-59 Days Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	277	346
Acquired Loans | Consumer Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	138	175
Acquired Loans | Consumer Loans | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	81	40
Acquired Loans | Consumer Loans | 60-89 Days Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	57	135
Acquired Loans | Consumer Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,751	2,395
Acquired Loans | Consumer Loans | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,251	1,965
Acquired Loans | Consumer Loans | 90 Days or Greater Past Due | Auto and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 500	$ 430

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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