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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 116,265 $ 94,536
Recorded Investment With No Allowance 14,505 12,120
Recorded Investment With Allowance 80,265 58,101
Total Recorded Investment 94,770 70,221
Related Allowance 29,160 16,235
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 15,020 9,094
Recorded Investment With No Allowance 4,874 2,842
Recorded Investment With Allowance 7,280 4,287
Total Recorded Investment 12,154 7,129
Related Allowance 5,785 2,558
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 88,531 67,900
Recorded Investment With No Allowance 4,777 6,817
Recorded Investment With Allowance 65,800 39,890
Total Recorded Investment 70,577 46,707
Related Allowance 19,722 9,671
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 9,553 15,774
Recorded Investment With No Allowance 3,864 2,168
Recorded Investment With Allowance 5,015 12,517
Total Recorded Investment 8,879 14,685
Related Allowance 1,483 2,599
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 697 0
Recorded Investment With No Allowance 697 0
Recorded Investment With Allowance 0 0
Total Recorded Investment 697 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 2,171 1,475
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 2,170 1,407
Total Recorded Investment 2,170 1,407
Related Allowance $ 2,170 $ 1,407