Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 96,850	$ 61,409	$ 62,224	$ 60,996
Charge-offs	(68,303)	(2,667)	(79,749)	(8,691)
Recoveries	231	532	520	1,320
Net (Charge-offs)/Recoveries	(68,072)	(2,135)	(79,229)	(7,371)
Provision for credit losses on loans	85,831	2,205	104,262	7,854
Balance at End of Period	$ 114,609	61,479	$ 114,609	61,479
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		34,903		33,707
Charge-offs		(528)		(529)
Recoveries		6		128
Net (Charge-offs)/Recoveries		(522)		(401)
Provision for credit losses on loans		(1,545)		(470)
Balance at End of Period		32,836		32,836
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		11,996		11,596
Charge-offs		(1,435)		(6,912)
Recoveries		91		508
Net (Charge-offs)/Recoveries		(1,344)		(6,404)
Provision for credit losses on loans		2,575		8,035
Balance at End of Period		13,227		13,227
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		6,757		7,983
Charge-offs		0		0
Recoveries		2		3
Net (Charge-offs)/Recoveries		2		3
Provision for credit losses on loans		495		(732)
Balance at End of Period		7,254		7,254
Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		6,178		6,187
Charge-offs		(247)		(410)
Recoveries		344		492
Net (Charge-offs)/Recoveries		97		82
Provision for credit losses on loans		296		302
Balance at End of Period		6,571		6,571
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		1,575		1,523
Charge-offs		(457)		(840)
Recoveries		89		189
Net (Charge-offs)/Recoveries		(368)		(651)
Provision for credit losses on loans		384		719
Balance at End of Period		$ 1,591		$ 1,591