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Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance $ 94,536 $ 172,396 $ 113,188
Recorded Investment With No Allowance 12,120 68,726 55,172
Recorded Investment With Allowance 58,101 76,884 38,851
Total Recorded Investment 70,221 145,610 94,023
Related Allowance 16,235 20,820 9,186
Average Recorded Investment 108,127 113,907 102,163
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 9,094 60,781 40,288
Recorded Investment With No Allowance 2,842 28,038 19,862
Recorded Investment With Allowance 4,287 15,722 9,047
Total Recorded Investment 7,129 43,760 28,909
Related Allowance 2,558 7,553 5,436
Average Recorded Investment 18,246 30,073 26,074
Commercial and Industrial, Energy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 67,900 99,606 60,522
Recorded Investment With No Allowance 6,817 33,080 27,759
Recorded Investment With Allowance 39,890 61,162 29,804
Total Recorded Investment 46,707 94,242 57,563
Related Allowance 9,671 13,267 3,750
Average Recorded Investment 75,453 76,492 57,360
Commercial Real Estate, Buildings, Land and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 15,774 10,795 11,369
Recorded Investment With No Allowance 2,168 6,394 6,866
Recorded Investment With Allowance 12,517 0 0
Total Recorded Investment 14,685 6,394 6,866
Related Allowance 2,599 0 0
Average Recorded Investment 12,799 6,164 17,729
Construction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 0 0 0
Recorded Investment With No Allowance 0 0 0
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 0 0 0
Related Allowance 0 0 0
Average Recorded Investment 0 0 438
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 293 1,214 977
Recorded Investment With No Allowance 293 1,214 655
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 293 1,214 655
Related Allowance 0 0 0
Average Recorded Investment 704 1,167 537
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 1,475 0 32
Recorded Investment With No Allowance 0 0 30
Recorded Investment With Allowance 1,407 0 0
Total Recorded Investment 1,407 0 30
Related Allowance 1,407 0 0
Average Recorded Investment $ 925 $ 11 $ 25