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Basis of Financial Statement Presentation and Summary of Significant Accounting Policies - Schedule of CECL Standard Adoption Impact (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   $ 0 $ 1,499        
ACL - loans   106,238 325,943 $ 365,489 $ 104,735 $ 104,664 $ 95,677
Liabilities:              
ACL - off-balance sheet credit exposures (recorded in other liabilities)   654 6,700        
Portfolio loans   21,440,212 22,281,940        
Residential mortgage              
Assets:              
ACL - loans   7,598 22,837 33,955 7,372 7,109 7,454
Liabilities:              
Portfolio loans     1,739,563        
Consumer              
Assets:              
ACL - loans   1,955 6,849 $ 7,293 $ 1,948 $ 2,254 $ 2,843
Liabilities:              
Portfolio loans     200,212        
Commercial loans portfolio segment              
Liabilities:              
Portfolio loans   18,995,568 20,342,165        
Residential mortgage portfolio segment              
Assets:              
ACL - loans   7,598          
Liabilities:              
Portfolio loans   2,210,112 1,739,563        
Residential mortgage portfolio segment | Residential mortgage              
Assets:              
ACL - loans   7,598          
Liabilities:              
Portfolio loans   2,210,112          
Consumer portfolio segment              
Assets:              
ACL - loans   1,955          
Liabilities:              
Portfolio loans   234,532 200,212        
Consumer portfolio segment | Consumer              
Assets:              
ACL - loans   1,955          
Liabilities:              
Portfolio loans   234,532          
Commercial and industrial | Commercial loans portfolio segment              
Assets:              
ACL - loans   52,548          
Liabilities:              
Portfolio loans   8,232,719 9,331,717        
Real estate | Commercial loans portfolio segment              
Assets:              
ACL - loans   44,137          
Liabilities:              
Portfolio loans   10,762,849 11,010,448        
Originated              
Liabilities:              
Portfolio loans   15,433,966          
Originated | Residential mortgage portfolio segment | Residential mortgage              
Liabilities:              
Portfolio loans   541,681          
Originated | Consumer portfolio segment | Consumer              
Liabilities:              
Portfolio loans   121,310          
Originated | Commercial and industrial | Commercial loans portfolio segment              
Liabilities:              
Portfolio loans   6,982,226          
Originated | Real estate | Commercial loans portfolio segment              
Liabilities:              
Portfolio loans   7,788,749          
Acquired              
Liabilities:              
Portfolio loans   6,006,246          
Acquired | Residential mortgage portfolio segment | Residential mortgage              
Liabilities:              
Portfolio loans   1,668,431          
Acquired | Consumer portfolio segment | Consumer              
Liabilities:              
Portfolio loans   113,222          
Acquired | Commercial and industrial | Commercial loans portfolio segment              
Liabilities:              
Portfolio loans   1,250,493          
Acquired | Real estate | Commercial loans portfolio segment              
Liabilities:              
Portfolio loans   2,974,100          
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration              
Assets:              
ACL - loans   2,300 3,100        
PCI Loans              
Liabilities:              
Portfolio loans   116,274          
PCI Loans | Residential mortgage portfolio segment              
Liabilities:              
Portfolio loans   63,098          
PCI Loans | Consumer portfolio segment              
Liabilities:              
Portfolio loans   6,815          
Corporate              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   0 70        
State and municipal              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   0 $ 1,384        
As reported under CECL              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   796          
ACL - loans   196,822          
Liabilities:              
ACL - off-balance sheet credit exposures (recorded in other liabilities)   6,749          
As reported under CECL | Residential mortgage portfolio segment | Residential mortgage              
Assets:              
ACL - loans   21,702          
As reported under CECL | Consumer portfolio segment | Consumer              
Assets:              
ACL - loans   4,312          
As reported under CECL | Commercial and industrial | Commercial loans portfolio segment              
Assets:              
ACL - loans   103,847          
As reported under CECL | Real estate | Commercial loans portfolio segment              
Assets:              
ACL - loans   66,961          
As reported under CECL | Corporate              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   108          
As reported under CECL | State and municipal              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   688          
Impact of CECL adoption              
Assets:              
ACL - loans   90,584          
Liabilities:              
ACL - off-balance sheet credit exposures (recorded in other liabilities)   6,100          
Impact of CECL adoption | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total ACL - loans   90,584          
ACL - HTM securities   796          
ACL - off balance sheet credit exposure (recorded in other liabilities)   6,095          
Total impact of CECL adoption   97,475          
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   796          
ACL - loans   90,584          
Liabilities:              
ACL - off-balance sheet credit exposures (recorded in other liabilities)   6,095          
Impact of CECL adoption | Residential mortgage              
Assets:              
ACL - loans   14,104          
Impact of CECL adoption | Consumer              
Assets:              
ACL - loans   2,357          
Impact of CECL adoption | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total ACL - loans $ 49,268            
ACL - HTM securities 576            
ACL - off balance sheet credit exposure (recorded in other liabilities) 4,410            
Total impact of CECL adoption 54,254            
Impact of CECL adoption | Tax effect | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total ACL - loans 18,820            
ACL - HTM securities 220            
ACL - off balance sheet credit exposure (recorded in other liabilities) 1,685            
Total impact of CECL adoption 20,725            
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration              
Assets:              
ACL - loans   68,088          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses (“ACL”) - loans   68,088          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential mortgage portfolio segment | Residential mortgage              
Assets:              
ACL - loans   942          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer portfolio segment | Consumer              
Assets:              
ACL - loans   1,087          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial and industrial | Commercial loans portfolio segment              
Assets:              
ACL - loans   44,675          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Real estate | Commercial loans portfolio segment              
Assets:              
ACL - loans   21,384          
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses (“ACL”) - loans 49,268            
Impact of CECL adoption | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Tax effect | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses (“ACL”) - loans 18,820            
Impact of CECL adoption | PCI Loans              
Assets:              
ACL - loans   22,496          
Impact of CECL adoption | PCI Loans | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
ACL - loans - (adjustment related to purchase credit impaired loan mark)1   22,496          
Impact of CECL adoption | PCI Loans | Residential mortgage portfolio segment | Residential mortgage              
Assets:              
ACL - loans   13,162          
Impact of CECL adoption | PCI Loans | Consumer portfolio segment | Consumer              
Assets:              
ACL - loans   1,270          
Impact of CECL adoption | PCI Loans | Commercial and industrial | Commercial loans portfolio segment              
Assets:              
ACL - loans   6,624          
Impact of CECL adoption | PCI Loans | Real estate | Commercial loans portfolio segment              
Assets:              
ACL - loans   1,440          
Impact of CECL adoption | PCI Loans | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
ACL - loans - (adjustment related to purchase credit impaired loan mark)1 0            
Impact of CECL adoption | PCI Loans | Tax effect | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
ACL - loans - (adjustment related to purchase credit impaired loan mark)1 $ 0            
Impact of CECL adoption | Corporate | Accounting Standards Update 2016-13              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   108          
Impact of CECL adoption | State and municipal              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   688          
Impact of CECL adoption | State and municipal | Accounting Standards Update 2016-13              
Assets:              
Debt securities, held-to-maturity, allowance for credit loss   $ 688