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Business Segments (Tables)
 12 Months Ended
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