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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 133,508 $ 113,188
Recorded Investment With No Allowance 79,450 55,172
Recorded Investment With Allowance 31,089 38,851
Total Recorded Investment 110,539 94,023
Related Allowance 3,601 9,186
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 35,005 40,288
Recorded Investment With No Allowance 18,113 19,862
Recorded Investment With Allowance 5,763 9,047
Total Recorded Investment 23,876 28,909
Related Allowance 2,751 5,436
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 84,912 60,522
Recorded Investment With No Allowance 53,313 27,759
Recorded Investment With Allowance 25,326 29,804
Total Recorded Investment 78,639 57,563
Related Allowance 850 3,750
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 11,635 11,369
Recorded Investment With No Allowance 6,453 6,866
Recorded Investment With Allowance 0 0
Total Recorded Investment 6,453 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 1,881 977
Recorded Investment With No Allowance 1,548 655
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,548 655
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 75 32
Recorded Investment With No Allowance 23 30
Recorded Investment With Allowance 0 0
Total Recorded Investment 23 30
Related Allowance $ 0 $ 0