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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 188,528 $ 89,981
Recorded Investment With No Allowance 80,951 60,944
Recorded Investment With Allowance 90,869 16,534
Total Recorded Investment 171,820 77,478
Related Allowance 30,302 4,378
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 27,980 26,067
Recorded Investment With No Allowance 20,367 18,776
Recorded Investment With Allowance 4,390 4,084
Total Recorded Investment 24,757 22,860
Related Allowance 2,852 2,378
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 122,242 25,240
Recorded Investment With No Allowance 27,612 8,689
Recorded Investment With Allowance 86,479 12,450
Total Recorded Investment 114,091 21,139
Related Allowance 27,450 2,000
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 36,348 37,126
Recorded Investment With No Allowance 31,545 32,425
Recorded Investment With Allowance 0 0
Total Recorded Investment 31,545 32,425
Related Allowance 0 0
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,218 793
Recorded Investment With No Allowance 970 569
Recorded Investment With Allowance 0 0
Total Recorded Investment 970 569
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 740 755
Recorded Investment With No Allowance 457 485
Recorded Investment With Allowance 0 0
Total Recorded Investment 457 485
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