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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 167,824 $ 113,188
Recorded Investment With No Allowance 72,740 55,172
Recorded Investment With Allowance 65,742 38,851
Total Recorded Investment 138,482 94,023
Related Allowance 14,932 9,186
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 48,751 40,288
Recorded Investment With No Allowance 31,065 19,862
Recorded Investment With Allowance 3,937 9,047
Total Recorded Investment 35,002 28,909
Related Allowance 1,665 5,436
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 107,883 60,522
Recorded Investment With No Allowance 34,834 27,759
Recorded Investment With Allowance 61,805 29,804
Total Recorded Investment 96,639 57,563
Related Allowance 13,267 3,750
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 9,976 11,369
Recorded Investment With No Allowance 5,627 6,866
Recorded Investment With Allowance 0 0
Total Recorded Investment 5,627 6,866
Related Allowance 0 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 1,214 977
Recorded Investment With No Allowance 1,214 655
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,214 655
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 0 32
Recorded Investment With No Allowance 0 30
Recorded Investment With Allowance 0 0
Total Recorded Investment 0 30
Related Allowance $ 0 $ 0