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Allowance for Credit Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses $ 223,936 $ 222,450 $ 225,141 $ 226,825 $ 226,583 $ 223,712
Total loan and leases 32,621,208   28,656,355      
Loans acquired with deteriorated credit quality 495,878   558,716      
Commercial | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses 7,290 6,906 33,213 32,088 31,944 35,270
Commercial | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses       47,850 48,962 43,451
Commercial | Other commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses       2,252 2,342 2,481
Commercial | Commercial and industrial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses 26,772 24,633 61,610 59,179 56,901 55,620
Commercial | Other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses       2,215 2,183 2,221
Consumer | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses 1,609 1,640 2,709 2,898 2,750 2,350
Consumer | Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses       35,130 35,105 35,841
Non-PCD Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     12,915      
ALLL for loans and leases collectively evaluated for impairment     204,690      
Total allowance for loan and lease losses     217,605      
Loans and leases individually evaluated for impairment     185,599      
Loans and leases collectively evaluated for impairment     28,137,181      
Total loan and leases     28,322,780      
Non-PCD Loans | Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     5,634      
Loans and leases individually evaluated for impairment     88,893      
Non-PCD Loans | Commercial | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     463      
ALLL for loans and leases collectively evaluated for impairment     32,750      
Total allowance for loan and lease losses     33,213      
Loans and leases individually evaluated for impairment     4,655      
Loans and leases collectively evaluated for impairment     1,008,799      
Total loan and leases     1,013,454      
Non-PCD Loans | Commercial | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     3,650      
ALLL for loans and leases collectively evaluated for impairment     41,685      
Total allowance for loan and lease losses     45,335      
Loans and leases individually evaluated for impairment     70,149      
Loans and leases collectively evaluated for impairment     12,212,486      
Total loan and leases     12,282,635      
Non-PCD Loans | Commercial | Other commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     39      
ALLL for loans and leases collectively evaluated for impairment     2,172      
Total allowance for loan and lease losses     2,211      
Loans and leases individually evaluated for impairment     1,268      
Loans and leases collectively evaluated for impairment     540,760      
Total loan and leases     542,028      
Non-PCD Loans | Commercial | Commercial and industrial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     1,379      
ALLL for loans and leases collectively evaluated for impairment     57,995      
Total allowance for loan and lease losses     59,374      
Loans and leases individually evaluated for impairment     12,182      
Loans and leases collectively evaluated for impairment     4,391,610      
Total loan and leases     4,403,792      
Non-PCD Loans | Commercial | Other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     103      
ALLL for loans and leases collectively evaluated for impairment     2,133      
Total allowance for loan and lease losses     2,236      
Loans and leases individually evaluated for impairment     639      
Loans and leases collectively evaluated for impairment     309,454      
Total loan and leases     310,093      
Non-PCD Loans | Consumer | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     174      
ALLL for loans and leases collectively evaluated for impairment     2,535      
Total allowance for loan and lease losses     2,709      
Loans and leases individually evaluated for impairment     3,882      
Loans and leases collectively evaluated for impairment     353,503      
Total loan and leases     357,385      
Non-PCD Loans | Consumer | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     3,278      
ALLL for loans and leases collectively evaluated for impairment     14,954      
Total allowance for loan and lease losses     18,232      
Loans and leases individually evaluated for impairment     60,442      
Loans and leases collectively evaluated for impairment     5,233,475      
Total loan and leases     5,293,917      
Non-PCD Loans | Consumer | Revolving mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     2,722      
ALLL for loans and leases collectively evaluated for impairment     16,980      
Total allowance for loan and lease losses     19,702      
Loans and leases individually evaluated for impairment     28,869      
Loans and leases collectively evaluated for impairment     2,310,203      
Total loan and leases     2,339,072      
Non-PCD Loans | Consumer | Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
ALLL for loans and leases individually evaluated for impairment     1,107      
ALLL for loans and leases collectively evaluated for impairment     33,486      
Total allowance for loan and lease losses     34,593      
Loans and leases individually evaluated for impairment     3,513      
Loans and leases collectively evaluated for impairment     1,776,891      
Total loan and leases     1,780,404      
PCD Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Total allowance for loan and lease losses $ 25,127 $ 26,928 7,536 $ 6,867 $ 8,343 $ 9,144
PCD Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Acquired loans which have adverse change in expected cash flows     $ 139,400