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Allowance for Credit Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses $ 209,259 $ 225,141 $ 228,775 $ 223,712
Total loan and leases 29,031,700 28,656,355    
Loans acquired with deteriorated credit quality 560,352 558,716    
Commercial | Construction and land development        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses 2,290 33,213 37,476 35,270
Commercial | Mortgage        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses     45,281 43,451
Commercial | Other commercial real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses     2,399 2,481
Commercial | Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses 30,619 61,610 57,025 55,620
Commercial | Other        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses     2,167 2,221
Consumer | Construction and land development        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses 1,140 2,709 2,473 2,350
Consumer | Consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total allowance for loan and lease losses     34,492 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 $ 26,916 7,536 $ 8,980 $ 9,144
PCD Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Acquired loans which have adverse change in expected cash flows   $ 139,400