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LOAN PORTFOLIO - Corporation's Aging of Loans Held for Investment Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 574,654 $ 848,763  
Financing Receivable, Current 8,136,829 7,843,539  
Loans held for investment 8,858,123 8,850,476 $ 8,886,873
90 days past due and still accruing 129,083 131,420  
Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 3,163,208 3,290,957 3,296,031
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 3,750,202 3,809,622  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 111,520 170,705  
Financing Receivable, Current 1,407,678 1,440,084  
Loans held for investment 1,522,662 1,614,972  
90 days past due and still accruing 946 6,687  
Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 1,944,713 1,749,897 1,716,628
Finance Leases Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 8,193 15,270  
Financing Receivable, Current 325,343 242,192  
Loans held for investment 333,536 257,462  
90 days past due and still accruing 0 0  
Commercial And Industrial Sector [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 2,148,111 2,083,253  
Commercial And Industrial Sector [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 38,001 97,703  
Financing Receivable, Current 2,110,110 1,985,550  
Loans held for investment 2,148,111 2,083,253 2,180,455
90 days past due and still accruing 5,003 2,317  
Other Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 223,928 286,252  
Financing Receivable, Current 2,648,899 2,711,775  
Loans held for investment 3,016,003 3,152,018  
90 days past due and still accruing 14,564 15,459  
Other Loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 26,057 25,189  
Financing Receivable, Current 638,644 622,915  
Loans held for investment 664,701 648,104  
90 days past due and still accruing 3,752 3,991  
Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 79,429 111,397 124,951
Construction Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,102 2,082  
Financing Receivable, Current 9,049 5,828  
Loans held for investment 11,151 7,910  
90 days past due and still accruing 0 0  
Construction Loans [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 35,100  
Financing Receivable, Current 47,965 41,456  
Loans held for investment 47,965 76,556  
90 days past due and still accruing 0 0  
Construction Loans [Member] | Land [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,534 15,301  
Financing Receivable, Current 13,779 11,630  
Loans held for investment 20,313 26,931  
90 days past due and still accruing 67 151  
Auto loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 49,385 91,554  
Financing Receivable, Current 897,091 752,777  
Loans held for investment 946,476 844,331  
90 days past due and still accruing 0 0  
FHA/VA government-guaranteed loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 108,934 109,607  
Financing Receivable, Current 38,271 29,332  
Loans held for investment 147,205 138,939  
90 days past due and still accruing 104,751 102,815  
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 49,020 87,856  
30-59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Loans held for investment 5,100 9,000  
30-59 Days Past Due [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,502 10,549  
30-59 Days Past Due [Member] | Commercial And Industrial Sector [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,550 8,971  
30-59 Days Past Due [Member] | Other Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Loans held for investment 101,400 224,000  
30-59 Days Past Due [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 9,898 10,776  
30-59 Days Past Due [Member] | Construction Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
30-59 Days Past Due [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
30-59 Days Past Due [Member] | Construction Loans [Member] | Land [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Loans held for investment 200 2,500  
30-59 Days Past Due [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 31,070 57,560  
30-59 Days Past Due [Member] | FHA/VA government-guaranteed loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Loans held for investment 5,600 6,000  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 80,578 139,933  
60-89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,038 7,525  
60-89 Days Past Due [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,362 3,484  
60-89 Days Past Due [Member] | Commercial And Industrial Sector [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 66 576  
60-89 Days Past Due [Member] | Other Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 62,077 92,502  
60-89 Days Past Due [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,542 5,052  
60-89 Days Past Due [Member] | Construction Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 95  
60-89 Days Past Due [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
60-89 Days Past Due [Member] | Construction Loans [Member] | Land [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 207 124  
60-89 Days Past Due [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 7,103 23,783  
60-89 Days Past Due [Member] | FHA/VA government-guaranteed loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,183 6,792  
90 days or more Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 445,056 620,974  
90 days or more Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 110,482 163,180  
90 days or more Past Due [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,329 1,237  
90 days or more Past Due [Member] | Commercial And Industrial Sector [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 35,385 88,156  
90 days or more Past Due [Member] | Other Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 161,851 193,750  
90 days or more Past Due [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,617 9,361  
90 days or more Past Due [Member] | Construction Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,102 1,987  
90 days or more Past Due [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 35,100  
90 days or more Past Due [Member] | Construction Loans [Member] | Land [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,327 15,177  
90 days or more Past Due [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,212 10,211  
90 days or more Past Due [Member] | FHA/VA government-guaranteed loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 104,751 102,815  
Financial Asset Acquired with Credit Deterioration [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 36,423 46,260  
Financing Receivable, Current 110,217 111,914  
Loans held for investment 146,640 158,174 165,818
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 33,911 43,071  
Financing Receivable, Current 109,265 110,920  
Loans held for investment 143,176 153,991 162,676
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 3,464 4,183  
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0 0
Financial Asset Acquired with Credit Deterioration [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Commercial And Industrial Sector [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0 0
Financial Asset Acquired with Credit Deterioration [Member] | Other Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 143,176 153,991  
Financial Asset Acquired with Credit Deterioration [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0 $ 0
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member] | Land [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | FHA/VA government-guaranteed loans [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans held for investment 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Financial Asset Acquired with Credit Deterioration [Member] | 30-59 Days Past Due [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Loans held for investment 11,600 28,100  
Financial Asset Acquired with Credit Deterioration [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,979 16,955  
Financial Asset Acquired with Credit Deterioration [Member] | 60-89 Days Past Due [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,979 16,600  
Financial Asset Acquired with Credit Deterioration [Member] | 90 days or more Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 29,444 29,305  
Financial Asset Acquired with Credit Deterioration [Member] | 90 days or more Past Due [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 26,932 $ 26,471