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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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