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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     $ 163,225
Balance sheet reclassification $ 5,987    
Total pre-tax effect 88,306    
Tax effect 20,701    
Decrease to retained earnings $ 67,605    
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   $ 245,544  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   82,319 82,300
Residential mortgage      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     10,209
Residential mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   81,473  
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   71,264  
Real estate - construction | Commercial Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     9,993
Real estate - construction | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   13,325  
Real estate - construction | Commercial Loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   3,332  
Real estate - owner-occupied | Commercial Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     16,115
Real estate - owner-occupied | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   8,579  
Real estate - owner-occupied | Commercial Loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   (7,536)  
Real estate - non-owner-occupied | Commercial Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     38,170
Real estate - non-owner-occupied | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   67,029  
Real estate - non-owner-occupied | Commercial Loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   28,859  
Commercial and industrial | Commercial Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     62,112
Commercial and industrial | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   47,456  
Commercial and industrial | Commercial Loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   (14,656)  
Consumer - Home equity | Consumer and other loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     14,231
Consumer - Home equity | Consumer and other loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   17,039  
Consumer - Home equity | Consumer and other loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   2,808  
Other | Consumer and other loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses     $ 12,395
Other | Consumer and other loans | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   10,643  
Other | Consumer and other loans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses   $ (1,752)