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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 52,310 $ 69,656
Recorded Investment With No Allowance 36,739 50,473
Recorded Investment With Allowance 6,799 3,118
Total Recorded Investment 43,538 53,591
Related Allowance 2,508 1,680
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 706 706
Recorded Investment With No Allowance 636 636
Recorded Investment With Allowance 0 0
Total Recorded Investment 636 636
Related Allowance 0 0
Commercial and industrial, Other commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 31,782 42,212
Recorded Investment With No Allowance 21,728 29,007
Recorded Investment With Allowance 6,636 2,853
Total Recorded Investment 28,364 31,860
Related Allowance 2,437 1,613
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 17,959 22,919
Recorded Investment With No Allowance 12,972 17,441
Recorded Investment With Allowance 163 265
Total Recorded Investment 13,135 17,706
Related Allowance 71 67
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 469 3,007
Recorded Investment With No Allowance 254 2,793
Recorded Investment With Allowance 0 0
Total Recorded Investment 254 2,793
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,394 812
Recorded Investment With No Allowance 1,149 596
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,149 596
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