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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases $ 291,420   $ 157,629
Reserve For Unfunded Commitments     5,106
Commercial real estate      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 99,778   50,847
Reserve For Unfunded Commitments     534
Commercial      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 146,607   73,820
Reserve For Unfunded Commitments     2,539
Residential      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 34,251   24,714
Reserve For Unfunded Commitments     149
Consumer & other, net      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 10,784   8,248
Reserve For Unfunded Commitments     $ 1,884
Accounting Standards Update 2016-13 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment [1]   $ (40,181)  
Allowance for credit losses on loans and leases 49,999 207,628  
Reserve For Unfunded Commitments   8,344  
$ Increase (decrease)   $ 53,237  
% Increase (decrease)   33.00%  
Accounting Standards Update 2016-13 [Member] | Commercial real estate      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 5,077 $ 55,924  
Reserve For Unfunded Commitments   4,564  
$ Increase (decrease)   $ 9,107  
% Increase (decrease)   18.00%  
Accounting Standards Update 2016-13 [Member] | Commercial      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 44,009 $ 117,829  
Reserve For Unfunded Commitments   2,052  
$ Increase (decrease)   $ 43,522  
% Increase (decrease)   57.00%  
Accounting Standards Update 2016-13 [Member] | Residential      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases 2,099 $ 26,813  
Reserve For Unfunded Commitments   1,416  
$ Increase (decrease)   $ 3,366  
% Increase (decrease)   14.00%  
Accounting Standards Update 2016-13 [Member] | Consumer & other, net      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses on loans and leases $ (1,186) $ 7,062  
Reserve For Unfunded Commitments   312  
$ Increase (decrease)   $ (2,758)  
% Increase (decrease)   (27.00%)  
Accounting Standards Update 2016-13 [Member] | Retained Earnings (Accumulated Deficit)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment [1]   $ (40,181)  
[1] The cumulative effect adjustment relates to the implementation of new accounting guidance for the allowance for credit losses. Refer to Note 1 for discussion of the new accounting guidance.