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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 106,771 $ 89,981
Recorded Investment With No Allowance 74,504 60,944
Recorded Investment With Allowance 15,058 16,534
Total Recorded Investment 89,562 77,478
Related Allowance 7,785 4,378
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 38,174 26,067
Recorded Investment With No Allowance 23,709 18,776
Recorded Investment With Allowance 5,159 4,084
Total Recorded Investment 28,868 22,860
Related Allowance 4,410 2,378
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 54,251 25,240
Recorded Investment With No Allowance 43,080 8,689
Recorded Investment With Allowance 8,298 12,450
Total Recorded Investment 51,378 21,139
Related Allowance 2,500 2,000
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 13,007 37,126
Recorded Investment With No Allowance 6,686 32,425
Recorded Investment With Allowance 1,601 0
Total Recorded Investment 8,287 32,425
Related Allowance 875 0
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 326 793
Recorded Investment With No Allowance 326 569
Recorded Investment With Allowance 0 0
Total Recorded Investment 326 569
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 971 755
Recorded Investment With No Allowance 662 485
Recorded Investment With Allowance 0 0
Total Recorded Investment 662 485
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 42 0
Recorded Investment With No Allowance 41 0
Recorded Investment With Allowance 0 0
Total Recorded Investment 41 0
Related Allowance $ 0 $ 0