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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 175,992 $ 172,396
Recorded Investment With No Allowance 52,375 68,726
Recorded Investment With Allowance 78,979 76,884
Total Recorded Investment 131,354 145,610
Related Allowance 23,410 20,820
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 38,136 60,781
Recorded Investment With No Allowance 1,802 28,038
Recorded Investment With Allowance 13,430 15,722
Total Recorded Investment 15,232 43,760
Related Allowance 7,930 7,553
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 123,351 99,606
Recorded Investment With No Allowance 41,569 33,080
Recorded Investment With Allowance 63,502 61,162
Total Recorded Investment 105,071 94,242
Related Allowance 14,772 13,267
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 13,078 10,795
Recorded Investment With No Allowance 7,577 6,394
Recorded Investment With Allowance 2,047 0
Total Recorded Investment 9,624 6,394
Related Allowance 708 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 1,427 1,214
Recorded Investment With No Allowance 1,427 1,214
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,427 1,214
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