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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 85,733 $ 94,536
Recorded Investment With No Allowance 15,810 12,120
Recorded Investment With Allowance 52,392 58,101
Total Recorded Investment 68,202 70,221
Related Allowance 18,836 16,235
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 18,536 9,094
Recorded Investment With No Allowance 4,455 2,842
Recorded Investment With Allowance 12,267 4,287
Total Recorded Investment 16,722 7,129
Related Allowance 6,276 2,558
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 55,043 67,900
Recorded Investment With No Allowance 5,866 6,817
Recorded Investment With Allowance 33,946 39,890
Total Recorded Investment 39,812 46,707
Related Allowance 9,721 9,671
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 10,329 15,774
Recorded Investment With No Allowance 5,196 2,168
Recorded Investment With Allowance 4,760 12,517
Total Recorded Investment 9,956 14,685
Related Allowance 1,420 2,599
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 293 293
Recorded Investment With No Allowance 293 293
Recorded Investment With Allowance 0 0
Total Recorded Investment 293 293
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,532 1,475
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 1,419 1,407
Total Recorded Investment 1,419 1,407
Related Allowance $ 1,419 $ 1,407