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LOANS - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for loan losses |  |
Total loans | $ 6,549,787 | $ 5,725,236
Business Activities Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 36,732 | 23,373
Collectively evaluated | 5,184,575 | 4,537,310
Total loans | 5,221,307 | 4,560,683
Acquired Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 5,605 | 4,806
Purchased credit-impaired loans | 46,816 | 21,362
Collectively evaluated | 1,276,059 | 1,138,385
Total loans | 1,328,480 | 1,164,553
Commercial real estate |  |
Allowance for loan losses |  |
Total loans | 2,616,438 | 2,059,767
Commercial real estate | Business Activities Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 25,549 | 11,560
Collectively evaluated | 1,900,795 | 1,622,467
Total loans | 1,926,344 | 1,634,027
Commercial real estate | Acquired Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 4,256 | 3,749
Purchased credit-impaired loans | 34,820 | 15,765
Collectively evaluated | 651,018 | 406,226
Total loans | 690,094 | 425,740
Commercial and industrial |  |
Allowance for loan losses |  |
Total loans | 1,062,038 | 1,048,263
Commercial and industrial | Business Activities Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 5,705 | 7,191
Collectively evaluated | 902,397 | 820,041
Total loans | 908,102 | 827,232
Commercial and industrial | Acquired Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 635 | 0
Purchased credit-impaired loans | 3,369 | 2,775
Collectively evaluated | 149,932 | 218,256
Total loans | 153,936 | 221,031
Residential mortgages |  |
Allowance for loan losses |  |
Total loans | 1,893,131 | 1,815,035
Residential mortgages | Business Activities Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 2,775 | 2,812
Collectively evaluated | 1,592,197 | 1,478,125
Total loans | 1,594,972 | 1,480,937
Residential mortgages | Acquired Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 308 | 570
Purchased credit-impaired loans | 7,283 | 2,572
Collectively evaluated | 290,568 | 330,956
Total loans | 298,159 | 334,098
Consumer |  |
Allowance for loan losses |  |
Total loans | 978,180 | 802,171
Consumer | Business Activities Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 2,703 | 1,810
Collectively evaluated | 789,186 | 616,677
Total loans | 791,889 | 618,487
Consumer | Acquired Loans |  |
Allowance for loan losses |  |
Individually evaluated for impairment | 406 | 487
Purchased credit-impaired loans | 1,344 | 250
Collectively evaluated | 184,541 | 182,947
Total loans | $ 186,291 | $ 183,684

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- Definition Financing Receivable, Purchased Credit-Impaired Loans + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&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://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=65884687&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=66008989&loc=d3e5074-111524 + Details
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