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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Advances from Federal Home Loan Banks	$ 84,000	$ 37,900
FHLB interest rate	2.93%	2.20%
Advances with fixed maturity dates	$ 84,000	$ 28,900
Weighted average interest rate on fixed maturity advances	2.93%	1.96%
Residential mortgages pledged as collateral for advances	$ 497,100	$ 1,000,000
Multifamily mortgage loans pledged as collateral for advances	550,000	1,100,000
Callable variable rate advances		$ 9,000
Weighted average interest rate on variable advances (in percent)		2.95%
Overnight borrowings of debt	$ 95,190	$ 0
Average interest rate of FHLB advances	2.38%
Unused commitments from FHLB	$ 1,300,000
Unused short-term or overnight borrowings from correspondent banks	22,000
Unused short-term or overnight borrowings from FRB	$ 903,700

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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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.

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