Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery [Abstract]
PPP loans originated [Line Items]	$ 387,000	$ 331,600
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	7,058,054	7,058,225
Loan balance	7,168,745	7,177,785
Financing Receivable, Allowance for Credit Loss	86,886	85,675	$ 61,503	$ 56,679
Off-Balance Sheet, Credit Loss, Liability	4,066	116
Deferred Tax Liabilities, Net		2,892
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,041,271	1,040,256
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		6,090
Off-Balance Sheet, Credit Loss, Liability		3,866
Deferred Tax Liabilities, Net		(2,115)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ (7,956)
7000 Hotels, Rooming Houses, Camps and Other Lodging Places
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	116,076
Additional Reserve Pandemic Risk	1,745
Loan balance	189,000
7000 Hotels, Rooming Houses, Camps and Other Lodging Places | Financial Asset Originated
Financing Receivable, Allowance for Credit Loss [Line Items]
Additional Reserve Pandemic Risk	1,900
722110 Full-Service Restaurants
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	30,414
Additional Reserve Pandemic Risk	687
5331 Retail, Variety Stores
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	185,159
Additional Reserve Pandemic Risk	2,045
Hotels, Restaurants, Strip Shopping Total
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans collectively evaluated for impairment	331,649
Additional Reserve Pandemic Risk	$ 4,477