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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 134,554 $ 172,396
Recorded Investment With No Allowance 25,976 68,726
Recorded Investment With Allowance 89,121 76,884
Total Recorded Investment 115,097 145,610
Related Allowance 24,662 20,820
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 23,510 60,781
Recorded Investment With No Allowance 3,710 28,038
Recorded Investment With Allowance 11,671 15,722
Total Recorded Investment 15,381 43,760
Related Allowance 7,667 7,553
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 90,744 99,606
Recorded Investment With No Allowance 19,461 33,080
Recorded Investment With Allowance 60,228 61,162
Total Recorded Investment 79,689 94,242
Related Allowance 14,371 13,267
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 18,382 10,795
Recorded Investment With No Allowance 2,512 6,394
Recorded Investment With Allowance 15,597 0
Total Recorded Investment 18,109 6,394
Related Allowance 999 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 293 1,214
Recorded Investment With No Allowance 293 1,214
Recorded Investment With Allowance 0 0
Total Recorded Investment 293 1,214
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,625 0
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 1,625 0
Total Recorded Investment 1,625 0
Related Allowance $ 1,625 $ 0