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Significant Accounting Policies (Impact Of Adoption Of CECL On Assets, Liabilities And Retained Earnings) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Available-for-sale Securities $ 423,815   $ 1,074,169
Deferred tax asset, net 178,957   176,740
Loans 6,759,927   4,726,493
Allowance for credit losses (235,313)   (116,539)
Total loans 6,579,140   6,641,847
Liabilities 8,954,669   8,252,183
Commercial Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans 2,426,795   1,862,827
Mortgage Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans 2,352,585   899,595
Consumer Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans $ 1,980,547   $ 1,964,071
Accounting Standards Update 2016-13 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Available-for-sale Securities   $ 1,074,169  
Deferred tax asset, net   190,614  
Loans   6,808,908  
Allowance for credit losses   (206,259)  
Total loans   6,602,649  
Allowance for credit losses on off-balance sheet credit exposures   3,858  
Liabilities   7,863,574  
Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   2,264,228  
Allowance for credit losses   (80,591)  
Accounting Standards Update 2016-13 [Member] | Mortgage Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   2,516,651  
Allowance for credit losses   (49,192)  
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   504,688  
Allowance for credit losses   (27,045)  
Accounting Standards Update 2016-13 [Member] | Auto Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   1,523,341  
Allowance for credit losses   (49,431)  
Accounting Standards Update 2016-13 [Member] | Scenario Previously Reported [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Available-for-sale Securities   1,074,169  
Deferred tax asset, net   176,740  
Loans   6,758,386  
Allowance for credit losses   (116,539)  
Total loans   6,641,847  
Allowance for credit losses on off-balance sheet credit exposures   3,688  
Liabilities   7,889,068  
Accounting Standards Update 2016-13 [Member] | Scenario Previously Reported [Member] | Commercial Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   2,222,085  
Allowance for credit losses   (34,886)  
Accounting Standards Update 2016-13 [Member] | Scenario Previously Reported [Member] | Mortgage Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   2,508,821  
Allowance for credit losses   (30,382)  
Accounting Standards Update 2016-13 [Member] | Scenario Previously Reported [Member] | Consumer Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   504,507  
Allowance for credit losses   (18,446)  
Accounting Standards Update 2016-13 [Member] | Scenario Previously Reported [Member] | Auto Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   1,522,973  
Allowance for credit losses   (32,825)  
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Available-for-sale Securities   0  
Deferred tax asset, net   13,874  
Loans   50,522  
Allowance for credit losses   (89,720)  
Total loans   (39,198)  
Allowance for credit losses on off-balance sheet credit exposures   170  
Liabilities   (25,494)  
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment [Member] | Commercial Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   42,143  
Allowance for credit losses   (45,705)  
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment [Member] | Mortgage Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   7,830  
Allowance for credit losses   (18,810)  
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment [Member] | Consumer Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   181  
Allowance for credit losses   (8,599)  
Accounting Standards Update 2016-13 [Member] | Restatement Adjustment [Member] | Auto Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   368  
Allowance for credit losses   (16,606)  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect On Retained Earnings [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Available-for-sale Securities   0  
Deferred tax asset, net   13,874  
Loans   0  
Allowance for credit losses   (39,198)  
Total loans   (39,198)  
Allowance for credit losses on off-balance sheet credit exposures   170  
Liabilities   (25,494)  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect On Retained Earnings [Member] | Commercial Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   0  
Allowance for credit losses   (3,562)  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect On Retained Earnings [Member] | Mortgage Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   0  
Allowance for credit losses   (10,980)  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect On Retained Earnings [Member] | Consumer Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   0  
Allowance for credit losses   (8,418)  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect On Retained Earnings [Member] | Auto Portfolio Segment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Loans   0  
Allowance for credit losses   $ (16,238)