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Loans and Allowance for Credit Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   $ 90,512    
Individually evaluated for impairment   3,280    
Total allowance for loan losses $ 222,465 94,777 $ 87,194 $ 83,575
Collectively evaluated for impairment   19,708,817    
Individually evaluated for impairment 73,850 58,144    
Loans 20,396,853 19,787,876    
Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 60,239      
Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 7,903      
Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 5,708      
Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   20,915    
Commercial real estate – mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   32,134    
Individually evaluated for impairment   1,235    
Total allowance for loan losses   33,369    
Collectively evaluated for impairment   7,681,608    
Individually evaluated for impairment   18,122    
Loans   7,709,218    
Commercial real estate – mortgage | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   9,488    
Commercial real estate- owner occupied        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses 23,634 13,406 12,618 11,297
Individually evaluated for impairment 15,086      
Loans 2,650,170 2,669,766    
Commercial real estate- owner occupied | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 14,951      
Commercial real estate- owner occupied | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 135      
Commercial real estate- owner occupied | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Commercial real estate- Non-owner occupied        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses 32,114 19,963 17,549 15,649
Individually evaluated for impairment 11,259      
Loans 5,070,572 5,039,452    
Commercial real estate- Non-owner occupied | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 11,259      
Commercial real estate- Non-owner occupied | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Commercial real estate- Non-owner occupied | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Consumer real estate – mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   6,762    
Individually evaluated for impairment   1,292    
Total allowance for loan losses 32,998 8,054 8,369 7,670
Collectively evaluated for impairment   3,036,922    
Individually evaluated for impairment 31,247 25,018    
Loans 3,106,465 3,068,625    
Consumer real estate – mortgage | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 31,247      
Consumer real estate – mortgage | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Consumer real estate – mortgage | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Consumer real estate – mortgage | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   6,685    
Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   12,629    
Individually evaluated for impairment   33    
Total allowance for loan losses 38,911 12,662 10,915 11,128
Collectively evaluated for impairment   2,426,901    
Individually evaluated for impairment 2,488 561    
Loans 2,520,937 2,430,483    
Construction and land development | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 2,488      
Construction and land development | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Construction and land development | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Construction and land development | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   3,021    
Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   35,401    
Individually evaluated for impairment   711    
Total allowance for loan losses 88,060 36,112 32,699 31,731
Collectively evaluated for impairment   6,274,280    
Individually evaluated for impairment 13,721 14,295    
Loans 6,752,317 6,290,296    
Commercial and industrial | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 294      
Commercial and industrial | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 7,768      
Commercial and industrial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 5,659      
Commercial and industrial | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   1,721    
Consumer and other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment   3,586    
Individually evaluated for impairment   9    
Total allowance for loan losses 6,748 3,595 4,803 5,423
Collectively evaluated for impairment   289,106    
Individually evaluated for impairment 49 148    
Loans 296,392 289,254    
Consumer and other | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Consumer and other | Business Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 0      
Consumer and other | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 49      
Consumer and other | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses [1]   0    
Loans acquired with deteriorated credit quality   0    
Unallocated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment      
Individually evaluated for impairment      
Total allowance for loan losses $ 0 985 $ 241 $ 677
Unallocated | Loans acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total allowance for loan losses      
[1] Prior to the adoption of ASC 326 on January 1, 2020, an allowance for loan losses was recorded on loans acquired with deteriorated credit quality only in the event of additional credit deterioration subsequent to acquisition.