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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of operating results and key financial measures by operating segments | The following tables present the operating results and other key financial measures for the individual operating segments as of and for the years ended December 31, 2017, 2016 and 2015:
($ in thousands) |  | Retail Banking |  | Commercial Banking |  | Other |  | Total
Year ended December 31, 2017: |  |  |  |  |  |  |  |
Interest income |  | $ | 364,906 |  |  | $ | 844,303 |  |  | $ | 115,910 |  |  | $ | 1,325,119 |
Charge for funds used |  | (142,619 | ) |  | (326,902 | ) |  | (64,256 | ) |  | (533,777 | )
Interest spread on funds used |  | 222,287 |  |  | 517,401 |  |  | 51,654 |  |  | 791,342 |
Interest expense |  | (76,770 | ) |  | (24,603 | ) |  | (38,677 | ) |  | (140,050 | )
Credit on funds provided |  | 445,304 |  |  | 61,019 |  |  | 27,454 |  |  | 533,777 |
Interest spread on funds provided |  | 368,534 |  |  | 36,416 |  |  | (11,223 | ) |  | 393,727 |
Net interest income before provision for credit losses |  | $ | 590,821 |  |  | $ | 553,817 |  |  | $ | 40,431 |  |  | $ | 1,185,069 |
Provision for credit losses |  | $ | 1,812 |  |  | $ | 44,454 |  |  | $ | — |  |  | $ | 46,266 |
Noninterest income |  | $ | 55,093 |  |  | $ | 110,104 |  |  | $ | 93,209 |  |  | $ | 258,406 |
Noninterest expense |  | $ | 320,287 |  |  | $ | 193,176 |  |  | $ | 148,646 |  |  | $ | 662,109 |
Segment income (loss) before income taxes |  | $ | 323,815 |  |  | $ | 426,291 |  |  | $ | (15,006 | ) |  | $ | 735,100 |
Segment income after income taxes |  | $ | 190,404 |  |  | $ | 251,834 |  |  | $ | 63,386 |  |  | $ | 505,624 |
As of December 31, 2017: |  |  |  |  |  |  |  |
Segment assets |  | $ | 9,316,587 |  |  | $ | 21,431,472 |  |  | $ | 6,402,190 |  |  | $ | 37,150,249 |
($ in thousands) |  | Retail Banking |  | Commercial Banking |  | Other |  | Total
Year ended December 31, 2016: |  |  |  |  |  |  |  |
Interest income |  | $ | 315,146 |  |  | $ | 726,013 |  |  | $ | 96,322 |  |  | $ | 1,137,481 |
Charge for funds used |  | (95,970 | ) |  | (216,849 | ) |  | (47,646 | ) |  | (360,465 | )
Interest spread on funds used |  | 219,176 |  |  | 509,164 |  |  | 48,676 |  |  | 777,016 |
Interest expense |  | (60,180 | ) |  | (16,892 | ) |  | (27,771 | ) |  | (104,843 | )
Credit on funds provided |  | 300,446 |  |  | 38,636 |  |  | 21,383 |  |  | 360,465 |
Interest spread on funds provided |  | 240,266 |  |  | 21,744 |  |  | (6,388 | ) |  | 255,622 |
Net interest income before (reversal of) provision for credit losses |  | $ | 459,442 |  |  | $ | 530,908 |  |  | $ | 42,288 |  |  | $ | 1,032,638 |
(Reversal of) provision for credit losses |  | $ | (4,356 | ) |  | $ | 31,835 |  |  | $ | — |  |  | $ | 27,479 |
Noninterest income |  | $ | 51,435 |  |  | $ | 96,010 |  |  | $ | 35,473 |  |  | $ | 182,918 |
Noninterest expense |  | $ | 306,570 |  |  | $ | 172,259 |  |  | $ | 137,060 |  |  | $ | 615,889 |
Segment income (loss) before income taxes |  | $ | 208,663 |  |  | $ | 422,824 |  |  | $ | (59,299 | ) |  | $ | 572,188 |
Segment income after income taxes |  | $ | 122,256 |  |  | $ | 248,474 |  |  | $ | 60,947 |  |  | $ | 431,677 |
As of December 31, 2016: |  |  |  |  |  |  |  |
Segment assets |  | $ | 7,821,610 |  |  | $ | 19,128,510 |  |  | $ | 7,838,720 |  |  | $ | 34,788,840 |
($ in thousands) |  | Retail Banking |  | Commercial Banking |  | Other |  | Total
Year ended December 31, 2015: |  |  |  |  |  |  |  |
Interest income |  | $ | 331,755 |  |  | $ | 654,966 |  |  | $ | 67,094 |  |  | $ | 1,053,815 |
Charge for funds used |  | (86,769 | ) |  | (163,601 | ) |  | (66,773 | ) |  | (317,143 | )
Interest spread on funds used |  | 244,986 |  |  | 491,365 |  |  | 321 |  |  | 736,672 |
Interest expense |  | (53,088 | ) |  | (18,025 | ) |  | (32,263 | ) |  | (103,376 | )
Credit on funds provided |  | 261,117 |  |  | 36,251 |  |  | 19,775 |  |  | 317,143 |
Interest spread on funds provided |  | 208,029 |  |  | 18,226 |  |  | (12,488 | ) |  | 213,767 |
Net interest income (loss) before (reversal of) provision for credit losses |  | $ | 453,015 |  |  | $ | 509,591 |  |  | $ | (12,167 | ) |  | $ | 950,439 |
(Reversal of) provision for credit losses |  | $ | (5,835 | ) |  | $ | 20,052 |  |  | $ | — |  |  | $ | 14,217 |
Noninterest income |  | $ | 46,265 |  |  | $ | 71,867 |  |  | $ | 65,251 |  |  | $ | 183,383 |
Noninterest expense |  | $ | 276,144 |  |  | $ | 159,987 |  |  | $ | 104,753 |  |  | $ | 540,884 |
Segment income (loss) before income taxes |  | $ | 228,971 |  |  | $ | 401,419 |  |  | $ | (51,669 | ) |  | $ | 578,721 |
Segment income after income taxes |  | $ | 134,383 |  |  | $ | 236,459 |  |  | $ | 13,835 |  |  | $ | 384,677 |
As of December 31, 2015: |  |  |  |  |  |  |  |
Segment assets |  | $ | 7,095,737 |  |  | $ | 17,923,319 |  |  | $ | 7,331,866 |  |  | $ | 32,350,922 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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