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LOAN PORTFOLIO - Corporation's Aging of Loans Held for Investment Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due $ 529,279 $ 574,654    
Financing Receivable, Current 8,323,094 8,136,829    
Loans held for investment 8,996,816 8,858,123 $ 8,695,890  
90 days past due and still accruing 120,204 129,083    
Residential mortgage loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 3,126,562 3,163,208 3,267,868  
Residential mortgage loans [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 214,309 223,928    
Financing Receivable, Current 2,629,619 2,648,899    
Loans held for investment 2,984,907 3,016,003    
90 days past due and still accruing 15,453 14,564    
Residential mortgage loans [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 104,427 108,934    
Financing Receivable, Current 37,228 38,271    
Loans held for investment 141,655 147,205    
90 days past due and still accruing 98,996 104,751    
Commercial loans[Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 3,854,962 3,750,202    
Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 95,783 111,520    
Financing Receivable, Current 1,459,477 1,407,678    
Loans held for investment 1,558,724 1,522,662 1,552,503  
90 days past due and still accruing 1,220 946    
Commercial loans[Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 29,108 38,001    
Financing Receivable, Current 2,182,623 2,110,110    
Loans held for investment 2,211,731 2,148,111 2,061,773  
90 days past due and still accruing 738 5,003    
Commercial loans[Member] | Construction Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 84,507 79,429 79,150  
Commercial loans[Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 1,869 2,102    
Financing Receivable, Current 9,592 9,049    
Loans held for investment 11,461 11,151    
90 days past due and still accruing 0 0    
Commercial loans[Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Financing Receivable, Current 53,384 47,965    
Loans held for investment 53,384 47,965    
90 days past due and still accruing 0 0    
Commercial loans[Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 6,240 6,534    
Financing Receivable, Current 13,422 13,779    
Loans held for investment 19,662 20,313    
90 days past due and still accruing 47 67    
Consumer Portfolio [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 2,015,292 1,944,713 1,734,596  
Consumer Portfolio [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 21,936 26,057    
Financing Receivable, Current 654,473 638,644    
Loans held for investment 676,409 664,701    
90 days past due and still accruing 3,750 3,752    
Consumer Portfolio [Member] | Auto loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 48,668 49,385    
Financing Receivable, Current 937,938 897,091    
Loans held for investment 986,606 946,476    
90 days past due and still accruing 0 0    
Consumer Portfolio [Member] | Finance leases loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 6,939 8,193    
Financing Receivable, Current 345,338 325,343    
Loans held for investment 352,277 333,536    
90 days past due and still accruing 0 0    
PCI loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 35,650 36,423    
Financing Receivable, Current 108,793 110,217    
Loans held for investment 144,443 146,640 155,281 $ 158,174
PCI loans | Residential mortgage loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 33,133 33,911    
Financing Receivable, Current 107,846 109,265    
Loans held for investment 140,979 143,176 151,067  
PCI loans | Residential mortgage loans [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 140,979 143,176    
PCI loans | Residential mortgage loans [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 2,517 2,512    
Financing Receivable, Current 947 952    
Loans held for investment 3,464 3,464 4,214  
PCI loans | Commercial loans[Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0 0  
PCI loans | Commercial loans[Member] | Construction Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0 0  
PCI loans | Commercial loans[Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Commercial loans[Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Commercial loans[Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Consumer Portfolio [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0 $ 0  
PCI loans | Consumer Portfolio [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Consumer Portfolio [Member] | Auto loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
PCI loans | Consumer Portfolio [Member] | Finance leases loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Loans held for investment 0 0    
30-59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 48,902 49,020    
30-59 Days Past Due [Member] | Residential mortgage loans [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 106,600 101,400    
30-59 Days Past Due [Member] | Residential mortgage loans [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 5,800 5,600    
30-59 Days Past Due [Member] | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 6,000 5,100    
30-59 Days Past Due [Member] | Commercial loans[Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 4,520 2,550    
30-59 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 500      
30-59 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 5,200      
30-59 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 100 200    
30-59 Days Past Due [Member] | Consumer Portfolio [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 7,616 9,898    
30-59 Days Past Due [Member] | Consumer Portfolio [Member] | Auto loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 31,584 31,070    
30-59 Days Past Due [Member] | Consumer Portfolio [Member] | Finance leases loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 5,182 5,502    
30-59 Days Past Due [Member] | PCI loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
30-59 Days Past Due [Member] | PCI loans | Residential mortgage loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 12,800 11,600    
30-59 Days Past Due [Member] | PCI loans | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
Loans held for investment 0 0    
60-89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 87,395 80,578    
60-89 Days Past Due [Member] | Residential mortgage loans [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 66,807 62,077    
60-89 Days Past Due [Member] | Residential mortgage loans [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 5,431 4,183    
60-89 Days Past Due [Member] | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 1,371 1,038    
60-89 Days Past Due [Member] | Commercial loans[Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 1,343 66    
60-89 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
60-89 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
60-89 Days Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 362 207    
60-89 Days Past Due [Member] | Consumer Portfolio [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 4,777 4,542    
60-89 Days Past Due [Member] | Consumer Portfolio [Member] | Auto loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 6,556 7,103    
60-89 Days Past Due [Member] | Consumer Portfolio [Member] | Finance leases loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 748 1,362    
60-89 Days Past Due [Member] | PCI loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 7,490 6,979    
60-89 Days Past Due [Member] | PCI loans | Residential mortgage loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 7,490 6,979    
60-89 Days Past Due [Member] | PCI loans | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
90 days or more Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 392,982 445,056    
90 days or more Past Due [Member] | Residential mortgage loans [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 147,502 161,851    
90 days or more Past Due [Member] | Residential mortgage loans [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 98,996 104,751    
90 days or more Past Due [Member] | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 94,412 110,482    
90 days or more Past Due [Member] | Commercial loans[Member] | Commercial And Industrial Sector [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 23,245 35,385    
90 days or more Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Residential [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 1,869 2,102    
90 days or more Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 0 0    
90 days or more Past Due [Member] | Commercial loans[Member] | Construction Loans [Member] | Land [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 5,878 6,327    
90 days or more Past Due [Member] | Consumer Portfolio [Member] | Other Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 9,543 11,617    
90 days or more Past Due [Member] | Consumer Portfolio [Member] | Auto loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 10,528 11,212    
90 days or more Past Due [Member] | Consumer Portfolio [Member] | Finance leases loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 1,009 1,329    
90 days or more Past Due [Member] | PCI loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 28,160 29,444    
90 days or more Past Due [Member] | PCI loans | Residential mortgage loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due 25,643 26,932    
90 days or more Past Due [Member] | PCI loans | Commercial loans[Member] | Mortgage Receivable [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Past Due $ 2,517 $ 2,512