Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Pascack Bancorp, Inc. [Member]	Harmony Bank [Member]	Common Stock [Member]	Common Stock [Member] Pascack Bancorp, Inc. [Member]	Common Stock [Member] Harmony Bank [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at Dec. 31, 2015	$ 400,516			$ 386,287			$ 13,079	$ 1,150
NET INCOME	29,565						29,565
Other comprehensive income, net of tax	5,209							5,209
Stock based compensation	1,494			1,494
Issuance of stock for acquisition		$ 37,221	$ 36,654		$ 37,221	$ 36,654
Issuance of stock	10			10
Retirement of restricted stock	(206)			(206)
Cash dividends, common stock	(11,741)						(11,741)
BALANCE at Sep. 30, 2016	498,722			461,460			30,903	6,359
BALANCE at Jun. 30, 2016								6,689
NET INCOME	11,327
Other comprehensive income, net of tax	(330)							(330)
BALANCE at Sep. 30, 2016	498,722			461,460			30,903	6,359
BALANCE at Dec. 31, 2016	550,044			510,861			38,590	593
NET INCOME	39,405						39,405
Other comprehensive income, net of tax	188							188
Stock based compensation	1,982			1,982
Exercise of stock options	313			313
Retirement of restricted stock	(773)			(773)
Cash dividends, common stock	(14,078)						(14,078)
BALANCE at Sep. 30, 2017	577,081			512,383			63,917	781
BALANCE at Jun. 30, 2017								609
NET INCOME	13,723
Other comprehensive income, net of tax	172							172
BALANCE at Sep. 30, 2017	$ 577,081			$ 512,383			$ 63,917	$ 781