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LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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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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