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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
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 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 $ 288,645 $ 285,372 94,777 $ 93,647 $ 90,253 $ 83,575
Collectively evaluated for impairment     19,708,817      
Individually evaluated for impairment 88,543   58,144      
Loans and Leases Receivable, Net of Deferred Income 22,477,409   19,787,876      
Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 59,785          
Business Assets            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 28,692          
Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 66          
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 and Leases Receivable, Net of Deferred Income     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 36,426 38,803 13,406 12,157 12,174 11,297
Individually evaluated for impairment 14,955          
Loans and Leases Receivable, Net of Deferred Income 2,748,075   2,669,766      
Commercial real estate- owner occupied | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 14,955          
Commercial real estate- owner occupied | Business Assets            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 0          
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 69,859 68,426 19,963 20,460 18,652 15,649
Individually evaluated for impairment 11,294          
Loans and Leases Receivable, Net of Deferred Income 5,220,452   5,039,452      
Commercial real estate- Non-owner occupied | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 11,294          
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 31,949 29,358 8,054 7,770 8,489 7,670
Collectively evaluated for impairment     3,036,922      
Individually evaluated for impairment 27,122   25,018      
Loans and Leases Receivable, Net of Deferred Income 3,041,019   3,068,625      
Consumer real estate – mortgage | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 27,122          
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 41,222 41,897 12,662 11,874 11,206 11,128
Collectively evaluated for impairment     2,426,901      
Individually evaluated for impairment 4,362   561      
Loans and Leases Receivable, Net of Deferred Income 2,728,439   2,430,483      
Construction and land development | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 4,362          
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 102,208 100,610 36,112 34,575 37,436 31,731
Collectively evaluated for impairment     6,274,280      
Individually evaluated for impairment 30,789   14,295      
Loans and Leases Receivable, Net of Deferred Income 8,395,963   6,290,296      
Commercial and industrial | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 2,052          
Commercial and industrial | Business Assets            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 28,692          
Commercial and industrial | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 45          
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 6,981 6,278 3,595 4,304 2,114 5,423
Collectively evaluated for impairment     289,106      
Individually evaluated for impairment 21   148      
Loans and Leases Receivable, Net of Deferred Income 343,461   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 21          
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 $ 0 985 $ 2,507 $ 182 $ 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.