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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 155,364 $ 153,045 $ 135,859
Provision for loan losses 21,613 35,460 51,673
Charge-offs (59,975) (47,804) (48,328)
Recoveries 15,130 14,663 13,841
Net charge-offs (44,845) (33,141) (34,487)
Ending balance 132,132 155,364 153,045
Individually evaluated for impairment 16,235 20,820 9,186
Collectively evaluated for impairment 115,897 134,544 143,859
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 59,614 52,915 42,993
Provision for loan losses 11,354 24,152 22,181
Charge-offs (26,076) (20,619) (15,910)
Recoveries 3,688 3,166 3,651
Net charge-offs (22,388) (17,453) (12,259)
Ending balance 48,580 59,614 52,915
Individually evaluated for impairment 2,558 7,553 5,436
Collectively evaluated for impairment 46,022 52,061 47,479
Commercial And Industrial Energy Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 51,528 60,653 54,696
Provision for loan losses (9,355) 884 24,545
Charge-offs (13,940) (10,595) (18,644)
Recoveries 819 586 56
Net charge-offs (13,121) (10,009) (18,588)
Ending balance 29,052 51,528 60,653
Individually evaluated for impairment 9,671 13,267 3,750
Collectively evaluated for impairment 19,381 38,261 56,903
Commercial Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 30,948 30,213 24,313
Provision for loan losses 8,079 (11) 5,064
Charge-offs (619) (86) (82)
Recoveries 369 832 918
Net charge-offs (250) 746 836
Ending balance 38,777 30,948 30,213
Individually evaluated for impairment 2,599 0 0
Collectively evaluated for impairment 36,178 30,948 30,213
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 5,657 4,238 4,659
Provision for loan losses 1,984 1,925 (164)
Charge-offs (2,143) (925) (814)
Recoveries 605 419 557
Net charge-offs (1,538) (506) (257)
Ending balance 6,103 5,657 4,238
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 6,103 5,657 4,238
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 7,617 5,026 9,198
Provision for loan losses 9,551 8,510 47
Charge-offs (17,197) (15,579) (12,878)
Recoveries 9,649 9,660 8,659
Net charge-offs (7,548) (5,919) (4,219)
Ending balance 9,620 7,617 5,026
Individually evaluated for impairment 1,407 0 0
Collectively evaluated for impairment $ 8,213 $ 7,617 $ 5,026