Allowance for Loan and Lease Losses - Summary of Activity in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Valuation Allowance [Line Items]
Balance, beginning of period	$ 147,638	$ 159,820
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Charge-offs	$ (15,400)	(16,396)
Recoveries	2,321	606
Balance, end of period	188,307	149,433
Cumulative Effect, Period of Adoption, Adjustment
Valuation Allowance [Line Items]
Balance, beginning of period	$ 1,911
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	$ 149,549	159,820
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period	$ 122,695	130,983
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Charge-offs	$ (2)	(1,386)
Recoveries	817	43
Balance, end of period	170,752	122,967
Mortgage Receivable | Cumulative Effect, Period of Adoption, Adjustment
Valuation Allowance [Line Items]
Balance, beginning of period	99
Mortgage Receivable | Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	122,794	130,983
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period	$ 24,943	28,837
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Charge-offs	$ (15,398)	(15,010)
Recoveries	1,504	563
Balance, end of period	17,555	26,466
Other loans | Cumulative Effect, Period of Adoption, Adjustment
Valuation Allowance [Line Items]
Balance, beginning of period	1,812
Other loans | Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	26,755	28,837
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans	51,837	5,403
Non-Covered Loans | Mortgage Receivable
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans	47,143	(6,673)
Non-Covered Loans | Other loans
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans	$ 4,694	$ 12,076