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Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of investment securities
The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of available-for-sale investment securities, which are carried at fair value, and the held-to-maturity investment security, which is carried at amortized cost, as of December 31, 2017 and 2016:
 
($ in thousands)
 
As of December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
651,395

 
$
—

 
$
(11,115
)
 
$
640,280

U.S. government agency and U.S. government sponsored enterprise debt securities
 
206,815

 
62

 
(3,485
)
 
203,392

U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
328,348

 
141

 
(9,532
)
 
318,957

Residential mortgage-backed securities
 
1,199,869

 
3,964

 
(13,562
)
 
1,190,271

Municipal securities
 
99,636

 
655

 
(309
)
 
99,982

Non-agency residential mortgage-backed securities:
 
 
 
 
 
 
 
 
Investment grade (1)
 
9,136

 
3

 
(22
)
 
9,117

Corporate debt securities:
 
 
 
 
 
 
 
 
Investment grade (1)
 
37,585

 
164

 
(746
)
 
37,003

Foreign bonds:
 
 
 
 
 
 
 
 
Investment grade (1) (2)
 
505,396

 
24

 
(19,012
)
 
486,408

Other securities
 
31,887

 
—

 
(545
)
 
31,342

Total available-for-sale investment securities
 
3,070,067

 
5,013

 
(58,328
)
 
3,016,752

Held-to-maturity investment security:
 
 
 
 
 
 
 
 
Non-agency commercial mortgage-backed security
 
—

 
—

 
—

 
—

Total investment securities
 
$
3,070,067

 
$
5,013

 
$
(58,328
)
 
$
3,016,752

 
 
 
 
 
 
 
 
 
 
($ in thousands)
 
As of December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
730,287

 
$
21

 
$
(9,829
)
 
$
720,479

U.S. government agency and U.S. government sponsored enterprise debt securities
 
277,891

 
224

 
(3,249
)
 
274,866

U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
272,672

 
345

 
(6,218
)
 
266,799

Residential mortgage-backed securities
 
1,266,372

 
3,924

 
(11,549
)
 
1,258,747

Municipal securities
 
148,302

 
1,252

 
(1,900
)
 
147,654

Non-agency residential mortgage-backed securities:
 
 
 
 
 
 
 
 
Investment grade (1)
 
11,592

 
—

 
(115
)
 
11,477

Corporate debt securities:
 
 
 
 
 
 
 
 
Investment grade (1)
 
222,190

 
562

 
(375
)
 
222,377

Non-investment grade (1)
 
10,191

 
—

 
(1,018
)
 
9,173

Foreign bonds:
 
 
 
 
 
 
 
 
Investment grade (1) (2)
 
405,443

 
30

 
(21,579
)
 
383,894

Other securities
 
40,501

 
337

 
(509
)
 
40,329

Total available-for-sale investment securities
 
3,385,441

 
6,695

 
(56,341
)
 
3,335,795

Held-to-maturity investment security:
 
 
 
 
 
 
 
 
Non-agency commercial mortgage-backed security
 
143,971

 
622

 
—

 
144,593

Total investment securities
 
$
3,529,412

 
$
7,317

 
$
(56,341
)
 
$
3,480,388

 
(1)
Available-for-sale investment securities rated BBB- or higher by Standard & Poor’s (“S&P”) or Baa3 or higher by Moody’s are considered investment grade.  Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade. Classifications are based on the lower of the credit ratings by S&P or Moody’s.
(2)
Fair value of foreign bonds include $456.1 million and $353.6 million of multilateral development bank bonds as of December 31, 2017 and 2016, respectively.
Schedule of gross unrealized losses and related fair values of investment securities
Unrealized Losses

The following tables present the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of December 31, 2017 and 2016:
 
($ in thousands)
 
As of December 31, 2017
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
168,061

 
$
(1,005
)
 
$
472,219

 
$
(10,110
)
 
$
640,280

 
$
(11,115
)
U.S. government agency and U.S. government sponsored enterprise debt securities
 
99,935

 
(623
)
 
85,281

 
(2,862
)
 
185,216

 
(3,485
)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
113,775

 
(2,071
)
 
191,827

 
(7,461
)
 
305,602

 
(9,532
)
Residential mortgage-backed securities
 
413,621

 
(4,205
)
 
361,809

 
(9,357
)
 
775,430

 
(13,562
)
Municipal securities
 
8,490

 
(123
)
 
8,588

 
(186
)
 
17,078

 
(309
)
Non-agency residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
4,599

 
(22
)
 
—

 
—

 
4,599

 
(22
)
Corporate debt securities:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
—

 
—

 
11,905

 
(746
)
 
11,905

 
(746
)
Foreign bonds:
 
 
 
 
 
 
 
 
 


 


Investment grade
 
103,149

 
(1,325
)
 
352,239

 
(17,687
)
 
455,388

 
(19,012
)
Other securities
 
31,215

 
(545
)
 
—

 
—

 
31,215

 
(545
)
Total available-for-sale investment securities
 
942,845

 
(9,919
)
 
1,483,868

 
(48,409
)
 
2,426,713

 
(58,328
)
Held-to-maturity investment security:
 
 
 
 
 
 
 
 
 
 
 
 
Non-agency commercial mortgage-backed security
 
—

 
—

 
—

 
—

 
—

 
—

Total investment securities
 
$
942,845

 
$
(9,919
)
 
$
1,483,868

 
$
(48,409
)
 
$
2,426,713

 
$
(58,328
)
 
 
($ in thousands)
 
As of December 31, 2016
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
670,268

 
$
(9,829
)
 
$
—

 
$
—

 
$
670,268

 
$
(9,829
)
U.S. government agency and U.S. government sponsored enterprise debt securities
 
203,901

 
(3,249
)
 
—

 
—

 
203,901

 
(3,249
)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
202,106

 
(5,452
)
 
29,201

 
(766
)
 
231,307

 
(6,218
)
Residential mortgage-backed securities
 
629,324

 
(9,594
)
 
119,603

 
(1,955
)
 
748,927

 
(11,549
)
Municipal securities
 
57,655

 
(1,699
)
 
2,692

 
(201
)
 
60,347

 
(1,900
)
Non-agency residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
5,033

 
(101
)
 
6,444

 
(14
)
 
11,477

 
(115
)
Corporate debt securities:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
—

 
—

 
71,667

 
(375
)
 
71,667

 
(375
)
Non-investment grade
 
—

 
—

 
9,173

 
(1,018
)
 
9,173

 
(1,018
)
Foreign bonds:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
363,618

 
(21,327
)
 
14,258

 
(252
)
 
377,876

 
(21,579
)
Other securities
 
30,991

 
(509
)
 
—

 
—

 
30,991

 
(509
)
Total available-for-sale investment securities
 
2,162,896

 
(51,760
)
 
253,038

 
(4,581
)
 
2,415,934

 
(56,341
)
Held-to-maturity investment security:
 
 
 
 
 
 
 
 
 
 
 
 
Non-agency commercial mortgage-backed security
 
—

 
—

 
—

 
—

 
—

 
—

Total investment securities
 
$
2,162,896

 
$
(51,760
)
 
$
253,038

 
$
(4,581
)
 
$
2,415,934

 
$
(56,341
)
 
Rollforward of other than temporary impairment credit losses recognized in earnings
The following table presents a rollforward of the amounts related to the OTTI credit losses recognized in earnings for the years ended December 31, 2017, 2016 and 2015:
 
 
 
Year Ended December 31,
($ in thousands)
 
2017
 
2016
 
2015
Beginning balance
 
$
—

 
$
—

 
$
112,338

Reduction for securities sold
 
—

 
—

 
(112,338
)
Ending balance
 
$
—

 
$
—

 
$
—

 
Schedule of the proceeds, gross realized gains and losses related to the sales of available-for-sale investment securities
The following table presents the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities for the years ended December 31, 2017, 2016 and 2015:
 
 
 
Year Ended December 31,
($ in thousands)
 
2017
 
2016
 
2015
Proceeds from sales
 
$
832,844

 
$
1,275,645

 
$
1,669,334

Gross realized gains
 
$
8,037

 
$
10,487

 
$
40,367

Gross realized losses
 
$
—

 
$
125

 
$
—

Related tax expense
 
$
3,380

 
$
4,357

 
$
16,974

 
Schedule of maturities of investment securities

The following table presents the scheduled maturities of available-for-sale investment securities as of December 31, 2017:
 
($ in thousands)
 
Amortized
Cost
 
Fair
Value
Due within one year
 
$
602,560

 
$
583,126

Due after one year through five years
 
772,349

 
759,970

Due after five years through ten years
 
220,298

 
216,390

Due after ten years
 
1,474,860

 
1,457,266

Total available-for-sale investment securities
 
$
3,070,067

 
$
3,016,752

 
Schedule of restricted equity securities
The following table presents the restricted equity securities as of December 31, 2017 and 2016:
 
 
 
 
 
 
 
December 31,
($ in thousands)
 
2017
 
2016
Federal Reserve Bank stock
 
$
56,271

 
$
55,525

FHLB stock
 
17,250

 
17,250

Total
 
$
73,521

 
$
72,775