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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 105,793 $ 172,396
Recorded Investment With No Allowance 13,697 68,726
Recorded Investment With Allowance 64,659 76,884
Total Recorded Investment 78,356 145,610
Related Allowance 21,488 20,820
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 19,857 60,781
Recorded Investment With No Allowance 3,153 28,038
Recorded Investment With Allowance 6,574 15,722
Total Recorded Investment 9,727 43,760
Related Allowance 4,622 7,553
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 68,087 99,606
Recorded Investment With No Allowance 7,942 33,080
Recorded Investment With Allowance 43,614 61,162
Total Recorded Investment 51,556 94,242
Related Allowance 12,672 13,267
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 15,961 10,795
Recorded Investment With No Allowance 2,309 6,394
Recorded Investment With Allowance 12,876 0
Total Recorded Investment 15,185 6,394
Related Allowance 2,599 0
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 0 0
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 0 0
Total Recorded Investment 0 0
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 293 1,214
Recorded Investment With No Allowance 293 1,214
Recorded Investment With Allowance 0 0
Total Recorded Investment 293 1,214
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,595 0
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 1,595 0
Total Recorded Investment 1,595 0
Related Allowance $ 1,595 $ 0