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Loans and Allowance for Credit Losses - Schedule of Allowance for Credit Losses and Amortized Cost Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for loan losses:            
Total allowance for loan losses $ 131,388 [1]   $ 54,619 [1]   $ 55,461 $ 50,381
Loans and leases outstanding:            
Individually evaluated for impairment     104,767      
Collectively evaluated for impairment     11,978,895      
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance     33,862      
Total loans 13,786,479   12,117,524      
Previously Reported            
Allowance for loan losses:            
Individually evaluated for impairment     8,897      
Collectively evaluated for impairment     45,527      
Allowance for loan losses, Loans acquired with deteriorated credit quality     195      
Total allowance for loan losses   $ 54,619 54,619 $ 54,619 55,461  
Loans and leases outstanding:            
Total loans   12,117,524 12,117,524 12,117,524    
Commercial            
Allowance for loan losses:            
Total allowance for loan losses 30,567   21,359   21,742 19,246
Loans and leases outstanding:            
Individually evaluated for impairment     41,479      
Collectively evaluated for impairment     2,843,536      
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance     5,281      
Total loans 3,956,422   2,890,296      
Commercial | Previously Reported            
Allowance for loan losses:            
Individually evaluated for impairment     7,891      
Collectively evaluated for impairment     14,692      
Allowance for loan losses, Loans acquired with deteriorated credit quality     2      
Total allowance for loan losses   21,359 22,585 21,359 21,742  
Loans and leases outstanding:            
Total loans   2,815,154 2,890,296 2,815,154    
Commercial real estate            
Allowance for loan losses:            
Total allowance for loan losses 75,810   20,535   23,470 21,436
Loans and leases outstanding:            
Individually evaluated for impairment     63,288      
Collectively evaluated for impairment     5,084,737      
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance     18,767      
Total loans 5,946,512   5,166,792      
Commercial real estate | Previously Reported            
Allowance for loan losses:            
Individually evaluated for impairment     1,006      
Collectively evaluated for impairment     20,582      
Allowance for loan losses, Loans acquired with deteriorated credit quality     0      
Total allowance for loan losses   20,535 21,588 20,535 23,470  
Loans and leases outstanding:            
Total loans   4,889,253 5,166,792 4,889,253    
Residential real estate            
Allowance for loan losses:            
Total allowance for loan losses 12,608   2,299   2,277 1,763
Loans and leases outstanding:            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     2,326,907      
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance     7,382      
Total loans 2,248,422   2,334,289      
Residential real estate | Previously Reported            
Allowance for loan losses:            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     2,299      
Allowance for loan losses, Loans acquired with deteriorated credit quality     0      
Total allowance for loan losses   2,299 2,299 2,299 2,277  
Loans and leases outstanding:            
Total loans   $ 2,334,289 2,334,289 $ 2,334,289    
Consumer            
Allowance for loan losses:            
Total allowance for loan losses         7,972 $ 7,936
Loans and leases outstanding:            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     1,723,715      
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance     2,432      
Total loans $ 1,635,123   1,726,147      
Consumer | Previously Reported            
Allowance for loan losses:            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     7,954      
Allowance for loan losses, Loans acquired with deteriorated credit quality     193      
Total allowance for loan losses     8,147   $ 7,972  
Loans and leases outstanding:            
Total loans     $ 1,726,147      
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.