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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | $ 265,880 | $ 278,335 |  |
Charge offs | (27,081) | (56,246) |  |
Recoveries | 9,302 | 16,791 |  |
Net Charge offs | (17,779) | (39,455) |  |
Provision for loan losses | 4,500 | 27,000 |  |
Balance at end of period | 252,601 | 265,880 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | $ 32,497 | $ 25,846
Collectively evaluated |  |  | 220,104 | 240,034
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 265,880 | 265,880 | 252,601 | 265,880
Loans: |  |  |  |
Individually evaluated |  |  | 211,687 | 247,575
Collectively evaluated |  |  | 22,749,199 | 20,537,416
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 15,900 |
Total loans |  |  | 22,976,786 | 20,784,991
Commercial and industrial |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 123,068 | 140,126 |  |
Charge offs | (19,611) | (44,533) |  |
Recoveries | 6,406 | 11,465 |  |
Net Charge offs | (13,205) | (33,068) |  |
Provision for loan losses | 750 | 16,010 |  |
Balance at end of period | 110,613 | 123,068 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 17,628 | 10,838
Collectively evaluated |  |  | 92,985 | 112,230
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 110,613 | 140,126 | 110,613 | 123,068
Loans: |  |  |  |
Individually evaluated |  |  | 110,993 | 142,244
Collectively evaluated |  |  | 6,996,038 | 6,257,449
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 2,765 |
Total loans |  |  | 7,109,796 | 6,399,693
Commercial real estate — owner occupied |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 10,352 | 14,034 |  |
Charge offs | (1,042) | (344) |  |
Recoveries | 287 | 173 |  |
Net Charge offs | (755) | (171) |  |
Provision for loan losses | 1,213 | (3,511) |  |
Balance at end of period | 10,810 | 10,352 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 829 | 2,973
Collectively evaluated |  |  | 9,981 | 7,379
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 10,810 | 14,034 | 10,810 | 10,352
Loans: |  |  |  |
Individually evaluated |  |  | 20,255 | 26,234
Collectively evaluated |  |  | 866,356 | 775,975
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 1,719 |
Total loans |  |  | 888,330 | 802,209
Commercial real estate — investor |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 41,059 | 45,285 |  |
Charge offs | (1,202) | (991) |  |
Recoveries | 21 | 242 |  |
Net Charge offs | (1,181) | (749) |  |
Provision for loan losses | 4,272 | (3,477) |  |
Balance at end of period | 44,150 | 41,059 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 4,132 | 1,597
Collectively evaluated |  |  | 40,018 | 39,462
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 41,059 | 41,059 | 44,150 | 41,059
Loans: |  |  |  |
Individually evaluated |  |  | 16,381 | 19,118
Collectively evaluated |  |  | 3,969,829 | 3,296,136
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 10,205 |
Total loans |  |  | 3,996,415 | 3,315,254
Real estate construction |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 34,370 | 26,932 |  |
Charge offs | (53) | (604) |  |
Recoveries | 290 | 74 |  |
Net Charge offs | 237 | (530) |  |
Provision for loan losses | (5,455) | 7,968 |  |
Balance at end of period | 29,152 | 34,370 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 77 | 86
Collectively evaluated |  |  | 29,075 | 34,284
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 29,152 | 26,932 | 29,152 | 34,370
Loans: |  |  |  |
Individually evaluated |  |  | 448 | 467
Collectively evaluated |  |  | 1,486,464 | 1,451,217
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 247 |
Total loans |  |  | 1,487,159 | 1,451,684
Residential mortgage |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 29,607 | 27,046 |  |
Charge offs | (956) | (2,611) |  |
Recoveries | 690 | 927 |  |
Net Charge offs | (266) | (1,684) |  |
Provision for loan losses | 1,796 | 4,245 |  |
Balance at end of period | 31,137 | 29,607 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 6,208 | 6,512
Collectively evaluated |  |  | 24,929 | 23,095
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 31,137 | 27,046 | 31,137 | 29,607
Loans: |  |  |  |
Individually evaluated |  |  | 51,469 | 47,486
Collectively evaluated |  |  | 8,154,904 | 7,499,048
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 880 |
Total loans |  |  | 8,207,253 | 7,546,534
Home equity |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 22,126 | 20,364 |  |
Charge offs | (1,729) | (2,724) |  |
Recoveries | 1,192 | 3,194 |  |
Net Charge offs | (537) | 470 |  |
Provision for loan losses | (301) | 1,292 |  |
Balance at end of period | 21,288 | 22,126 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 3,514 | 3,718
Collectively evaluated |  |  | 17,774 | 18,408
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | 22,126 | 22,126 | 21,288 | 22,126
Loans: |  |  |  |
Individually evaluated |  |  | 11,092 | 10,891
Collectively evaluated |  |  | 900,187 | 872,913
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 84 |
Total loans |  |  | 911,363 | 883,804
Other consumer |  |  |  |
Changes in the allowance for loan losses by portfolio segment |  |  |  |
Balance at beginning of period | 5,298 | 4,548 |  |
Charge offs | (2,488) | (4,439) |  |
Recoveries | 416 | 716 |  |
Net Charge offs | (2,072) | (3,723) |  |
Provision for loan losses | 2,225 | 4,473 |  |
Balance at end of period | 5,451 | 5,298 |  |
Allowance for loan losses: |  |  |  |
Individually evaluated |  |  | 109 | 122
Collectively evaluated |  |  | 5,342 | 5,176
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total allowance for loan losses | $ 5,451 | $ 4,548 | 5,451 | 5,298
Loans: |  |  |  |
Individually evaluated |  |  | 1,049 | 1,135
Collectively evaluated |  |  | 375,421 | 384,678
Financing Receivable Acquired and Accounted under Modification of Impaired Loans |  |  | 0 |
Total loans |  |  | $ 376,470 | $ 385,813

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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=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: 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 + Details
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