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Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance $ 113,188 $ 89,981 $ 69,656
Recorded Investment With No Allowance 55,172 60,944 50,473
Recorded Investment With Allowance 38,851 16,534 3,118
Total Recorded Investment 94,023 77,478 53,591
Related Allowance 9,186 4,378 1,680
Average Recorded Investment 102,163 54,768 49,636
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 40,288 26,067 42,212
Recorded Investment With No Allowance 19,862 18,776 29,007
Recorded Investment With Allowance 9,047 4,084 2,853
Total Recorded Investment 28,909 22,860 31,860
Related Allowance 5,436 2,378 1,613
Average Recorded Investment 26,074 27,338 27,154
Commercial and Industrial, Energy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 60,522 25,240 706
Recorded Investment With No Allowance 27,759 8,689 636
Recorded Investment With Allowance 29,804 12,450 0
Total Recorded Investment 57,563 21,139 636
Related Allowance 3,750 2,000 0
Average Recorded Investment 57,360 7,235 571
Commercial Real Estate, Buildings, Land and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 11,369 37,126 22,919
Recorded Investment With No Allowance 6,866 32,425 17,441
Recorded Investment With Allowance 0 0 265
Total Recorded Investment 6,866 32,425 17,706
Related Allowance 0 0 67
Average Recorded Investment 17,729 18,211 20,339
Construction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 0 793 3,007
Recorded Investment With No Allowance 0 569 2,793
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 0 569 2,793
Related Allowance 0 0 0
Average Recorded Investment 438 1,320 739
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 977 755 812
Recorded Investment With No Allowance 655 485 596
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 655 485 596
Related Allowance 0 0 0
Average Recorded Investment 537 664 674
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 32 0 0
Recorded Investment With No Allowance 30 0 0
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 30 0 0
Related Allowance 0 0 0
Average Recorded Investment $ 25 $ 0 $ 159