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LOANS - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Loans receivable: balance at end of period |  |
Total loans | $ 9,941,828 | $ 9,043,253
Commercial real estate |  |
Loans receivable: balance at end of period |  |
Total loans | 4,005,347 | 3,400,221
Commercial and industrial loans |  |
Loans receivable: balance at end of period |  |
Total loans | 1,987,297 | 1,980,046
Residential mortgages |  |
Loans receivable: balance at end of period |  |
Total loans | 2,882,380 | 2,566,424
Consumer |  |
Loans receivable: balance at end of period |  |
Total loans | 1,066,804 | 1,096,562
Business Activities Loans |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 31,767 | 28,601
Collectively evaluated for impairment | 7,262,638 | 7,338,143
Total loans | 7,294,405 | 7,366,744
Business Activities Loans | Commercial real estate |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 22,035 | 23,345
Collectively evaluated for impairment | 2,637,463 | 2,565,366
Total loans | 2,659,498 | 2,588,711
Business Activities Loans | Commercial and industrial loans |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 6,753 | 2,825
Collectively evaluated for impairment | 1,465,013 | 1,510,713
Total loans | 1,471,766 | 1,513,538
Business Activities Loans | Residential mortgages |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 2,841 | 2,089
Collectively evaluated for impairment | 2,274,774 | 2,325,209
Total loans | 2,277,615 | 2,327,298
Business Activities Loans | Consumer |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 138 | 342
Collectively evaluated for impairment | 885,388 | 936,855
Total loans | 885,526 | 937,197
Acquired Loans |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 5,170 | 5,751
Purchased credit-impaired loans | 74,092 | 47,288
Collectively evaluated for impairment | 2,568,161 | 1,623,470
Total loans | 2,647,423 | 1,676,509
Acquired Loans | Commercial real estate |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 3,709 | 3,980
Purchased credit-impaired loans | 29,623 | 11,994
Collectively evaluated for impairment | 1,312,517 | 795,536
Total loans | 1,345,849 | 811,510
Acquired Loans | Commercial and industrial loans |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 372 | 763
Purchased credit-impaired loans | 31,456 | 29,539
Collectively evaluated for impairment | 483,703 | 436,206
Total loans | 515,531 | 466,508
Acquired Loans | Residential mortgages |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 740 | 362
Purchased credit-impaired loans | 12,050 | 4,888
Collectively evaluated for impairment | 591,975 | 233,876
Total loans | 604,765 | 239,126
Acquired Loans | Consumer |  |
Loans receivable: balance at end of period |  |
Individually evaluated for impairment | 349 | 646
Purchased credit-impaired loans | 963 | 867
Collectively evaluated for impairment | 179,966 | 157,852
Total loans | $ 181,278 | $ 159,365

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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