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Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) Valuation - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss $ 310,560 $ 165,021 $ 310,560 $ 165,021 $ 310,550 $ 186,925   $ 160,409 $ 152,717
Provision for Loan and Lease Losses (8,204) (4,000) (134,130) (14,500)          
Financing Receivable, Allowance for Credit Loss, Writeoff 8,773 2,099 14,593 6,968          
Financing Receivable, Allowance for Credit Loss, Recovery (579) (2,711) (4,098) (4,772)          
Financing Receivable, Collectively Evaluated for Impairment 25,654,269   25,654,269       $ 20,932,161    
Financing Receivable, Individually Evaluated for Impairment 338,985   338,985       116,303    
Loans and Leases Receivable, Net of Deferred Income 25,993,254   25,993,254       21,101,493    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 300,514   300,514       164,923    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 10,046   10,046       2,776    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             20,979    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             95,324    
Off-Balance Sheet, Credit Loss, Liability 44,400   44,400       8,955    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             24,055    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             99,440    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             123,495    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             20,921,137    
Financing Receivable Unpaid Principal Balance             21,108,472    
Impaired Financing Receivable, Related Allowance             2,776    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance 310,560   310,560       167,797    
Interest Receivable 120,100   120,100            
Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             53,029    
Impaired Financing Receivable, Unpaid Principal Balance             63,840    
Impaired Financing Receivable, Related Allowance             98    
Commercial and industrial [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss   77,419   77,419       79,635 83,118
Provision for Loan and Lease Losses   (2,815)   (3,128)          
Financing Receivable, Allowance for Credit Loss, Writeoff   1,950   6,092          
Financing Receivable, Allowance for Credit Loss, Recovery   (2,549)   (3,521)          
Financing Receivable, Collectively Evaluated for Impairment             9,333,059    
Financing Receivable, Individually Evaluated for Impairment             48,984    
Loans and Leases Receivable, Net of Deferred Income             9,382,043    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment             81,252    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment             1,050    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             6,919    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             42,065    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             9,844    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             43,848    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             53,692    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             9,312,100    
Financing Receivable Unpaid Principal Balance             9,365,792    
Impaired Financing Receivable, Related Allowance             1,050    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             82,302    
Commercial and industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             0    
Impaired Financing Receivable, Unpaid Principal Balance             0    
Impaired Financing Receivable, Related Allowance             0    
Tech & Innovation [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 38,836   38,836   54,559 22,394      
Provision for Loan and Lease Losses (9,359)   (25,556)            
Financing Receivable, Allowance for Credit Loss, Writeoff 6,364   9,114            
Financing Receivable, Allowance for Credit Loss, Recovery 0   0            
Financing Receivable, Collectively Evaluated for Impairment 2,227,995   2,227,995            
Financing Receivable, Individually Evaluated for Impairment 49,894   49,894            
Loans and Leases Receivable, Net of Deferred Income 2,277,889   2,277,889            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 38,836   38,836            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0            
Other commercial and industrial [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 108,753   108,753   109,930 95,784      
Provision for Loan and Lease Losses (621)   (13,653)            
Financing Receivable, Allowance for Credit Loss, Writeoff 748   2,684            
Financing Receivable, Allowance for Credit Loss, Recovery (192)   (2,000)            
Financing Receivable, Collectively Evaluated for Impairment 5,906,731   5,906,731            
Financing Receivable, Individually Evaluated for Impairment 86,981   86,981            
Loans and Leases Receivable, Net of Deferred Income 5,993,712   5,993,712            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 102,011   102,011            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 6,742   6,742            
Commercial Real Estate Owner Occupied [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 19,406   19,406   15,587 10,420      
Provision for Loan and Lease Losses (3,897)   (9,100)            
Financing Receivable, Allowance for Credit Loss, Writeoff 83   126            
Financing Receivable, Allowance for Credit Loss, Recovery (5)   (12)            
Financing Receivable, Collectively Evaluated for Impairment 1,912,127   1,912,127       2,296,342    
Financing Receivable, Individually Evaluated for Impairment 58,036   58,036       17,736    
Loans and Leases Receivable, Net of Deferred Income 1,970,163   1,970,163       2,316,913    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 19,406   19,406       13,842    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0       0    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             0    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             17,736    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             0    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             18,681    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             18,681    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             2,297,168    
Financing Receivable Unpaid Principal Balance             2,319,426    
Impaired Financing Receivable, Related Allowance             0    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             13,842    
Commercial Real Estate Owner Occupied [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             2,835    
Impaired Financing Receivable, Unpaid Principal Balance             3,577    
Impaired Financing Receivable, Related Allowance             0    
Commercial Real Estate Non Owner Occupied [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Collectively Evaluated for Impairment             5,159,921    
Financing Receivable, Individually Evaluated for Impairment             35,538    
Loans and Leases Receivable, Net of Deferred Income             5,245,634    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment             32,114    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment             1,219    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             11,913    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             23,625    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             11,949    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             24,738    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             36,687    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             5,177,477    
Financing Receivable Unpaid Principal Balance             5,274,355    
Impaired Financing Receivable, Related Allowance             1,219    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             33,431    
Commercial Real Estate Non Owner Occupied [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             50,175    
Impaired Financing Receivable, Unpaid Principal Balance             60,191    
Impaired Financing Receivable, Related Allowance             98    
Hotel franchise finance [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 38,027   38,027   35,864 14,104      
Provision for Loan and Lease Losses (2,163)   (23,923)            
Financing Receivable, Allowance for Credit Loss, Writeoff 0   0            
Financing Receivable, Allowance for Credit Loss, Recovery 0   0            
Financing Receivable, Collectively Evaluated for Impairment 1,885,451   1,885,451            
Financing Receivable, Individually Evaluated for Impairment 57,435   57,435            
Loans and Leases Receivable, Net of Deferred Income 1,942,886   1,942,886            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 35,312   35,312            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,715   2,715            
Other Commercial Real Estate Non owner Occupied [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 40,622   40,622   32,672 10,503      
Provision for Loan and Lease Losses (9,196)   (30,684)            
Financing Receivable, Allowance for Credit Loss, Writeoff 1,246   2,131            
Financing Receivable, Allowance for Credit Loss, Recovery 0   (1,566)            
Financing Receivable, Collectively Evaluated for Impairment 3,355,259   3,355,259            
Financing Receivable, Individually Evaluated for Impairment 78,673   78,673            
Loans and Leases Receivable, Net of Deferred Income 3,433,932   3,433,932            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 40,518   40,518            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 104   104            
Residential Real Estate [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 1,789 13,532 1,789 13,532 1,725 3,814   12,606 11,276
Provision for Loan and Lease Losses (16) (804) (2,103) (2,599)          
Financing Receivable, Allowance for Credit Loss, Writeoff 307 9 307 594          
Financing Receivable, Allowance for Credit Loss, Recovery (355) (131) (385) (251)          
Financing Receivable, Collectively Evaluated for Impairment 2,324,676   2,324,676       2,142,045    
Financing Receivable, Individually Evaluated for Impairment 5,388   5,388       5,600    
Loans and Leases Receivable, Net of Deferred Income 2,330,064   2,330,064       2,147,664    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,789   1,789       13,714    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0       0    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             0    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             5,600    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             0    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             5,708    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             5,708    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             2,113,893    
Financing Receivable Unpaid Principal Balance             2,119,673    
Impaired Financing Receivable, Related Allowance             0    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             13,714    
Residential Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             19    
Impaired Financing Receivable, Unpaid Principal Balance             72    
Impaired Financing Receivable, Related Allowance             0    
Construction And Land Development [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 38,781 27,318 38,781 27,318 35,792 6,218   26,091 22,513
Provision for Loan and Lease Losses (2,983) (1,210) (32,540) (4,865)          
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 141          
Financing Receivable, Allowance for Credit Loss, Recovery (6) (17) (23) (81)          
Financing Receivable, Collectively Evaluated for Impairment 2,267,922   2,267,922       1,943,735    
Financing Receivable, Individually Evaluated for Impairment 0   0       8,421    
Loans and Leases Receivable, Net of Deferred Income 2,267,922   2,267,922       1,952,156    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 38,781   38,781       23,387    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0       507    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             2,147    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             6,274    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             2,262    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             6,413    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             8,675    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             1,963,116    
Financing Receivable Unpaid Principal Balance             1,971,791    
Impaired Financing Receivable, Related Allowance             507    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             23,894    
Construction And Land Development [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             0    
Impaired Financing Receivable, Unpaid Principal Balance             0    
Impaired Financing Receivable, Related Allowance             0    
Warehouse lending [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 838   838   743 246      
Provision for Loan and Lease Losses (95)   (592)            
Financing Receivable, Allowance for Credit Loss, Writeoff 0   0            
Financing Receivable, Allowance for Credit Loss, Recovery 0   0            
Financing Receivable, Collectively Evaluated for Impairment 3,926,852   3,926,852            
Financing Receivable, Individually Evaluated for Impairment 0   0            
Loans and Leases Receivable, Net of Deferred Income 3,926,852   3,926,852            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 838   838            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0            
Municipal and nonprofit [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 17,896   17,896   17,128 17,397      
Provision for Loan and Lease Losses (768)   (499)            
Financing Receivable, Allowance for Credit Loss, Writeoff 0   0            
Financing Receivable, Allowance for Credit Loss, Recovery 0   0            
Financing Receivable, Collectively Evaluated for Impairment 1,684,738   1,684,738            
Financing Receivable, Individually Evaluated for Impairment 1,952   1,952            
Loans and Leases Receivable, Net of Deferred Income 1,686,690   1,686,690            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 17,454   17,454            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 442   442            
Other, loan segment                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss 5,612   5,612   $ 6,550 $ 6,045      
Provision for Loan and Lease Losses (934)   (314)            
Financing Receivable, Allowance for Credit Loss, Writeoff 25   231            
Financing Receivable, Allowance for Credit Loss, Recovery (21)   (112)            
Financing Receivable, Collectively Evaluated for Impairment 162,518   162,518            
Financing Receivable, Individually Evaluated for Impairment 626   626            
Loans and Leases Receivable, Net of Deferred Income 163,144   163,144            
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 5,569   5,569            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 43   $ 43            
Commercial Real Estate [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss   45,944   45,944       41,258 34,829
Provision for Loan and Lease Losses   (4,817)   (10,354)          
Financing Receivable, Allowance for Credit Loss, Writeoff   139   139          
Financing Receivable, Allowance for Credit Loss, Recovery   (8)   (900)          
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]                  
Valuation Allowance [Line Items]                  
Loans and Leases Receivable, Net of Deferred Income             2,316,913    
Commercial Real Estate [Member] | Commercial Real Estate Non Owner Occupied [Member]                  
Valuation Allowance [Line Items]                  
Loans and Leases Receivable, Net of Deferred Income             5,024,218    
Consumer Loan [Member]                  
Valuation Allowance [Line Items]                  
Financing Receivable, Allowance for Credit Loss   808   808       $ 819 $ 981
Provision for Loan and Lease Losses   (16)   (190)          
Financing Receivable, Allowance for Credit Loss, Writeoff   1   2          
Financing Receivable, Allowance for Credit Loss, Recovery   $ (6)   $ (19)          
Financing Receivable, Collectively Evaluated for Impairment             57,059    
Financing Receivable, Individually Evaluated for Impairment             24    
Loans and Leases Receivable, Net of Deferred Income             57,083    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment             614    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment             0    
Impaired Financing Receivable, with Related Allowance, Recorded Investment             0    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment             24    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance             0    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance             52    
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment             52    
Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment             57,383    
Financing Receivable Unpaid Principal Balance             57,435    
Impaired Financing Receivable, Related Allowance             0    
Impaired Financing Receivable With No Related Allowance             0    
Loans and Leases Receivable, Allowance             614    
Consumer Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]                  
Valuation Allowance [Line Items]                  
Impaired Financing Receivable, Recorded Investment             0    
Impaired Financing Receivable, Unpaid Principal Balance             0    
Impaired Financing Receivable, Related Allowance             $ 0