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COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Commitments and Contingencies [Line Items] |  |  |
Rental expenses under leases | $ 6,800 | $ 5,300 | $ 3,400
Federal funds purchased | 100,000 | $ 120,000 |
Bridgehampton National Bank |  |  |
Commitments and Contingencies [Line Items] |  |  |
Required cash balance with Federal Reserve Bank of New York | 7,300 |  |
Average balance maintained | 23,100 |  |
Federal funds purchased | 100,000 |  |
Amount available for transactions under Master Repurchase Agreement | 1,220,000 |  |
Bridgehampton National Bank | Overnight line of credit with the Federal Home Loan Bank of New York |  |  |
Commitments and Contingencies [Line Items] |  |  |
Lines of credit with unaffiliated correspondent banks to provide short-term credit | 349,500 |  |
Lines of credit available on an unsecured basis | $ 329,500 |  |

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- Definition Represents the amount available for transactions under Master Repurchase agreement with FHLB whereby FHLB agrees to purchase securities from the entity upon the entity's request, with the simultaneous agreement to sell the same or similar securities back to the entity at a future date. + References No definition available. + Details
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- Definition Represents amount of average balance invested with Federal Reserve Bank. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility on an unsecured basis. + References No definition available. + Details
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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
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- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Details
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- Details
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