Loans Receivable, Net - ACL Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for credit losses
Balance at beginning of period	$ 158,243	$ 124,490
Impact of adopting CECL		3,720
Acquisitions		49
Provision for credit losses	489	22,744
Charge-offs	(4,246)	(2,567)
Recoveries	1,960	1,754
Balance at end of period	156,446	150,190
Residential real estate
Allowance for credit losses
Balance at beginning of period	9,604	10,111
Impact of adopting CECL		3,584
Acquisitions		0
Provision for credit losses	(582)	(4,369)
Charge-offs	(38)	(20)
Recoveries	34	9
Balance at end of period	9,018	9,315
Commercial real estate
Allowance for credit losses
Balance at beginning of period	86,999	69,496
Impact of adopting CECL		10,533
Acquisitions		49
Provision for credit losses	7,463	(9,433)
Charge-offs	0	(30)
Recoveries	789	470
Balance at end of period	95,251	71,085
Other commercial
Allowance for credit losses
Balance at beginning of period	49,133	36,129
Impact of adopting CECL		(13,759)
Acquisitions		0
Provision for credit losses	(7,265)	34,133
Charge-offs	(2,762)	(785)
Recoveries	279	454
Balance at end of period	39,385	56,172
Home equity
Allowance for credit losses
Balance at beginning of period	8,182	4,937
Impact of adopting CECL		3,400
Acquisitions
Provision for credit losses	(89)	(508)
Charge-offs	(45)	(1)
Recoveries	20	106
Balance at end of period	8,068	7,934
Other consumer
Allowance for credit losses
Balance at beginning of period	4,325	3,817
Impact of adopting CECL		(38)
Acquisitions		0
Provision for credit losses	962	2,921
Charge-offs	(1,401)	(1,731)
Recoveries	838	715
Balance at end of period	$ 4,724	$ 5,684