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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 99,542 $ 92,438 $ 104,453
Provision for loan losses 51,845 16,314 20,582
Charge-offs (29,572) (28,485) (44,797)
Recoveries 14,044 19,275 12,200
Net charge-offs (15,528) (9,210) (32,597)
Ending balance 135,859 99,542 92,438
Individually evaluated for impairment 4,378 1,680 6,926
Collectively evaluated for impairment 131,481 97,862 85,512
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 44,273 46,700 46,585
Provision for loan losses 5,255 484 28,546
Charge-offs (11,092) (12,073) (32,008)
Recoveries 4,557 9,162 3,577
Net charge-offs (6,535) (2,911) (28,431)
Ending balance 42,993 44,273 46,700
Individually evaluated for impairment 2,378 1,613 4,140
Collectively evaluated for impairment 40,615 42,660 42,560
Commercial And Industrial Energy Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 14,919 6,090 7,579
Provision for loan losses 45,774 10,066 (576)
Charge-offs (6,000) (1,747) (924)
Recoveries 3 510 11
Net charge-offs (5,997) (1,237) (913)
Ending balance 54,696 14,919 6,090
Individually evaluated for impairment 2,000 67 0
Collectively evaluated for impairment 52,696 14,852 6,090
Commercial Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 27,163 22,590 29,346
Provision for loan losses (3,182) 6,573 (6,631)
Charge-offs (657) (3,800) (1,329)
Recoveries 989 1,800 1,204
Net charge-offs 332 (2,000) (125)
Ending balance 24,313 27,163 22,590
Individually evaluated for impairment 0 0 2,786
Collectively evaluated for impairment 24,313 27,163 19,804
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 5,178 5,230 5,252
Provision for loan losses (428) 681 697
Charge-offs (577) (1,097) (1,047)
Recoveries 486 364 328
Net charge-offs (91) (733) (719)
Ending balance 4,659 5,178 5,230
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 4,659 5,178 5,230
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 8,009 5,010 3,507
Provision for loan losses 4,426 5,328 3,912
Charge-offs (11,246) (9,768) (9,489)
Recoveries 8,009 7,439 7,080
Net charge-offs (3,237) (2,329) (2,409)
Ending balance 9,198 8,009 5,010
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 9,198 8,009 5,010
Unallocated [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 0 6,818 12,184
Provision for loan losses 0 (6,818) (5,366)
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs 0 0 0
Ending balance 0 0 6,818
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment $ 0 $ 0 $ 6,818