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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Debt Disclosure [Abstract] |  |
Advances from Federal Home Loan Banks | $ 37,898 | $ 61,800
FHLB interest rate | 2.20% | 2.02%
Advances with fixed maturity dates | $ 28,900 | $ 49,800
Weighted average interest rate on fixed maturity advances | 1.96% | 1.78%
Residential mortgages pledged as collateral for advances | $ 550,000 | $ 468,300
Multifamily mortgage loans pledged as collateral for advances | 1,100,000 | 1,200,000
Callable variable rate advances | $ 9,000 | $ 12,000
Weighted average interest rate on variable advances (in percent) | 2.95% | 3.01%
Investment pledges against advances | $ 13,500 | $ 14,600
Overnight borrowings of debt |  |
Unused commitments from FHLB | 1,200,000 |
Unused short-term or overnight borrowings from correspondent banks | 22,000 |
Unused short-term or overnight borrowings from FRB | $ 785,600 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of Federal Home Loan Bank (FHLB) advances which have fixed interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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