Loans Receivable, Net - Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Summary of Loans Receivable
Loans receivable	$ 11,269,929	$ 11,122,696
Allowance for credit losses	(156,446)	(158,243)	$ (150,190)	$ (124,490)
Loans receivable, net	11,113,483	10,964,453
Net deferred origination (fees) costs included in loans receivable	(37,946)	(26,709)
Net purchase accounting (discounts) premiums included in loans receivable	(15,122)	(17,091)
Accrued interest receivable on loans	50,989	53,538
Residential real estate
Summary of Loans Receivable
Loans receivable	745,097	802,508
Allowance for credit losses	(9,018)	(9,604)	(9,315)	(10,111)
Commercial real estate
Summary of Loans Receivable
Loans receivable	6,474,701	6,315,895
Allowance for credit losses	(95,251)	(86,999)	(71,085)	(69,496)
Other commercial
Summary of Loans Receivable
Loans receivable	3,100,584	3,054,817
Allowance for credit losses	(39,385)	(49,133)	(56,172)	(36,129)
Home equity
Summary of Loans Receivable
Loans receivable	625,369	636,405
Allowance for credit losses	(8,068)	(8,182)	(7,934)	(4,937)
Other consumer
Summary of Loans Receivable
Loans receivable	324,178	313,071
Allowance for credit losses	$ (4,724)	$ (4,325)	$ (5,684)	$ (3,817)