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Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance $ 172,396 $ 113,188 $ 89,981
Recorded Investment With No Allowance 68,726 55,172 60,944
Recorded Investment With Allowance 76,884 38,851 16,534
Total Recorded Investment 145,610 94,023 77,478
Related Allowance 20,820 9,186 4,378
Average Recorded Investment 113,907 102,163 54,768
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 60,781 40,288 26,067
Recorded Investment With No Allowance 28,038 19,862 18,776
Recorded Investment With Allowance 15,722 9,047 4,084
Total Recorded Investment 43,760 28,909 22,860
Related Allowance 7,553 5,436 2,378
Average Recorded Investment 30,073 26,074 27,338
Commercial and Industrial, Energy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 99,606 60,522 25,240
Recorded Investment With No Allowance 33,080 27,759 8,689
Recorded Investment With Allowance 61,162 29,804 12,450
Total Recorded Investment 94,242 57,563 21,139
Related Allowance 13,267 3,750 2,000
Average Recorded Investment 76,492 57,360 7,235
Commercial Real Estate, Buildings, Land and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 10,795 11,369 37,126
Recorded Investment With No Allowance 6,394 6,866 32,425
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 6,394 6,866 32,425
Related Allowance 0 0 0
Average Recorded Investment 6,164 17,729 18,211
Construction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 0 0 793
Recorded Investment With No Allowance 0 0 569
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 0 0 569
Related Allowance 0 0 0
Average Recorded Investment 0 438 1,320
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 1,214 977 755
Recorded Investment With No Allowance 1,214 655 485
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 1,214 655 485
Related Allowance 0 0 0
Average Recorded Investment 1,167 537 664
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 0 32 0
Recorded Investment With No Allowance 0 30 0
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 0 30 0
Related Allowance 0 0 0
Average Recorded Investment $ 11 $ 25 $ 0