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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 59,031 $ 69,656
Recorded Investment With No Allowance 46,673 50,473
Recorded Investment With Allowance 2,702 3,118
Total Recorded Investment 49,375 53,591
Related Allowance 1,534 1,680
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 13,206 706
Recorded Investment With No Allowance 13,130 636
Recorded Investment With Allowance 0 0
Total Recorded Investment 13,130 636
Related Allowance 0 0
Commercial and industrial, Other commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 26,763 42,212
Recorded Investment With No Allowance 20,037 29,007
Recorded Investment With Allowance 2,572 2,853
Total Recorded Investment 22,609 31,860
Related Allowance 1,463 1,613
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 17,821 22,919
Recorded Investment With No Allowance 12,741 17,441
Recorded Investment With Allowance 130 265
Total Recorded Investment 12,871 17,706
Related Allowance 71 67
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 467 3,007
Recorded Investment With No Allowance 243 2,793
Recorded Investment With Allowance 0 0
Total Recorded Investment 243 2,793
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 774 812
Recorded Investment With No Allowance 522 596
Recorded Investment With Allowance 0 0
Total Recorded Investment 522 596
Related Allowance 0 0
Consumer and Other [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