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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 98,412 $ 113,188
Recorded Investment With No Allowance 57,620 55,172
Recorded Investment With Allowance 23,255 38,851
Total Recorded Investment 80,875 94,023
Related Allowance 2,130 9,186
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 27,709 40,288
Recorded Investment With No Allowance 14,777 19,862
Recorded Investment With Allowance 4,040 9,047
Total Recorded Investment 18,817 28,909
Related Allowance 1,780 5,436
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 59,771 60,522
Recorded Investment With No Allowance 36,162 27,759
Recorded Investment With Allowance 19,215 29,804
Total Recorded Investment 55,377 57,563
Related Allowance 350 3,750
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 9,729 11,369
Recorded Investment With No Allowance 5,478 6,866
Recorded Investment With Allowance 0 0
Total Recorded Investment 5,478 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 1,203 977
Recorded Investment With No Allowance 1,203 655
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,203 655
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