Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Time Deposits [Line Items]
Interest-bearing demand	$ 1,720,383	$ 1,219,381
Aggregate amount of certificates of deposit exceeding threshold amount	1,100,000	$ 885,300
Stewardship Financial Corporation
Time Deposits [Line Items]
Interest-bearing demand	$ 31,600