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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 112,733 $ 94,536
Recorded Investment With No Allowance 23,827 12,120
Recorded Investment With Allowance 65,288 58,101
Total Recorded Investment 89,115 70,221
Related Allowance 19,973 16,235
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 15,281 9,094
Recorded Investment With No Allowance 3,554 2,842
Recorded Investment With Allowance 10,647 4,287
Total Recorded Investment 14,201 7,129
Related Allowance 6,698 2,558
Commercial and industrial, Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 66,754 67,900
Recorded Investment With No Allowance 6,342 6,817
Recorded Investment With Allowance 39,131 39,890
Total Recorded Investment 45,473 46,707
Related Allowance 8,996 9,671
Commercial real estate, Buildings, land and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 27,491 15,774
Recorded Investment With No Allowance 12,236 2,168
Recorded Investment With Allowance 14,086 12,517
Total Recorded Investment 26,322 14,685
Related Allowance 2,855 2,599
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 430 0
Recorded Investment With No Allowance 410 0
Recorded Investment With Allowance 0 0
Total Recorded Investment 410 0
Related Allowance 0 0
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,285 293
Recorded Investment With No Allowance 1,285 293
Recorded Investment With Allowance 0 0
Total Recorded Investment 1,285 293
Related Allowance 0 0
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 1,492 1,475
Recorded Investment With No Allowance 0 0
Recorded Investment With Allowance 1,424 1,407
Total Recorded Investment 1,424 1,407
Related Allowance $ 1,424 $ 1,407