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Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | $ 132,132 | $ 155,364 | $ 153,045
Provision for loan losses | 33,759 | 21,613 | 35,460
Charge-offs | (51,032) | (59,975) | (47,804)
Recoveries | 17,308 | 15,130 | 14,663
Net charge-offs | (33,724) | (44,845) | (33,141)
Ending balance | 132,167 | 132,132 | 155,364
Individually evaluated for impairment | 28,483 | 16,235 | 20,820
Collectively evaluated for impairment | 103,684 | 115,897 | 134,544
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 48,580 | 59,614 | 52,915
Provision for loan losses | 13,144 | 11,354 | 24,152
Charge-offs | (14,117) | (26,076) | (20,619)
Recoveries | 3,986 | 3,688 | 3,166
Net charge-offs | (10,131) | (22,388) | (17,453)
Ending balance | 51,593 | 48,580 | 59,614
Individually evaluated for impairment | 7,849 | 2,558 | 7,553
Collectively evaluated for impairment | 43,744 | 46,022 | 52,061
Commercial And Industrial Energy Financing Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 29,052 | 51,528 | 60,653
Provision for loan losses | 14,388 | (9,355) | 884
Charge-offs | (7,500) | (13,940) | (10,595)
Recoveries | 1,442 | 819 | 586
Net charge-offs | (6,058) | (13,121) | (10,009)
Ending balance | 37,382 | 29,052 | 51,528
Individually evaluated for impairment | 20,246 | 9,671 | 13,267
Collectively evaluated for impairment | 17,136 | 19,381 | 38,261
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 38,777 | 30,948 | 30,213
Provision for loan losses | (6,934) | 8,079 | (11)
Charge-offs | (1,025) | (619) | (86)
Recoveries | 219 | 369 | 832
Net charge-offs | (806) | (250) | 746
Ending balance | 31,037 | 38,777 | 30,948
Individually evaluated for impairment | 383 | 2,599 | 0
Collectively evaluated for impairment | 30,654 | 36,178 | 30,948
Total consumer real estate loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 6,103 | 5,657 | 4,238
Provision for loan losses | 467 | 1,984 | 1,925
Charge-offs | (3,665) | (2,143) | (925)
Recoveries | 1,208 | 605 | 419
Net charge-offs | (2,457) | (1,538) | (506)
Ending balance | 4,113 | 6,103 | 5,657
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 4,113 | 6,103 | 5,657
Consumer Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 9,620 | 7,617 | 5,026
Provision for loan losses | 12,694 | 9,551 | 8,510
Charge-offs | (24,725) | (17,197) | (15,579)
Recoveries | 10,453 | 9,649 | 9,660
Net charge-offs | (14,272) | (7,548) | (5,919)
Ending balance | 8,042 | 9,620 | 7,617
Individually evaluated for impairment | 5 | 1,407 | 0
Collectively evaluated for impairment | $ 8,037 | $ 8,213 | $ 7,617

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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