Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Summary of Loans Receivable
Loans receivable	$ 10,088,206	$ 9,512,810
Allowance for credit losses	(150,190)	(124,490)	$ (129,786)	$ (131,239)
Loans receivable, net	9,938,016	9,388,320
Net deferred origination (fees) costs included in loans receivable	(6,925)	(6,964)
Net purchase accounting (discounts) premiums included in loans receivable	(19,864)	(21,574)
Accrued interest receivable on loans	43,689	40,962
Residential Real Estate
Summary of Loans Receivable
Loans receivable	957,830	926,388
Allowance for credit losses	(9,315)	(10,111)	(10,711)	(10,631)
Commercial Real Estate
Summary of Loans Receivable
Loans receivable	5,928,303	5,579,307
Allowance for credit losses	(71,085)	(69,496)	(72,328)	(72,448)
Other Commercial
Summary of Loans Receivable
Loans receivable	2,239,878	2,094,254
Allowance for credit losses	(56,172)	(36,129)	(36,849)	(38,160)
Home Equity
Summary of Loans Receivable
Loans receivable	652,942	617,201
Allowance for credit losses	(7,934)	(4,937)	(5,880)	(5,811)
Other Consumer
Summary of Loans Receivable
Loans receivable	309,253	295,660
Allowance for credit losses	$ (5,684)	$ (3,817)	$ (4,018)	$ (4,189)