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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 8,376,417	$ 8,299,338
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	6,282,678	6,112,198
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,093,739	2,187,140
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,085,711	5,068,681
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,477,145	3,400,276
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,608,566	1,668,405
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,266,737	3,264,742
Commercial Real Estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,281,503	2,217,707
Commercial Real Estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	985,234	1,047,035
Commercial Real Estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	347,303	354,171
Commercial Real Estate | Construction | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	255,835	269,206
Commercial Real Estate | Construction | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	91,468	84,965
Commercial Real Estate | Single and multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	542,220	423,165
Commercial Real Estate | Single and multi-family | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	345,180	217,083
Commercial Real Estate | Single and multi-family | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	197,040	206,082
Commercial Real Estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,377,214	2,487,406
Commercial Real Estate | Other | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,680,488	1,731,418
Commercial Real Estate | Other | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	696,726	755,988
Commercial and industrial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,195,642	1,182,569
Commercial and industrial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	623,332	621,370
Commercial and industrial loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,818,974	1,803,939
Commercial and industrial loans | Other | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,195,642	1,182,569
Commercial and industrial loans | Other | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	623,332	621,370
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,181,807	2,102,807
Residential Mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,906,713	1,813,201
Residential Mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	275,094	289,606
Residential Mortgages | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	6,325	5,410
Residential Mortgages | Construction | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	6,121	5,177
Residential Mortgages | Construction | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	204	233
Residential Mortgages | 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,175,482	2,097,397
Residential Mortgages | 1-4 family | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,900,592	1,808,024
Residential Mortgages | 1-4 family | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	274,890	289,373
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,108,899	1,127,850
Consumer Loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	898,820	898,721
Consumer Loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	210,079	229,129
Consumer Loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	400,113	410,181
Consumer Loans | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	291,094	294,954
Consumer Loans | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	109,019	115,227
Consumer Loans | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	708,786	717,669
Consumer Loans | Auto and other | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	607,726	603,767
Consumer Loans | Auto and other | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 101,060	$ 113,902

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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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