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Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of available-for-sale 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 carried at fair value, as of March 31, 2018 and December 31, 2017:
 
 
 
As of March 31, 2018
($ in thousands)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available-for-sale investment securities:
 
 

 
 

 
 

 
 

U.S. Treasury securities
 
$
668,670

 
$
93

 
$
(16,933
)
 
$
651,830

U.S. government agency and U.S. government sponsored enterprise debt securities
 
235,776

 
175

 
(2,935
)
 
233,016

U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 

 
 

 
 

 
 

Commercial mortgage-backed securities
 
352,980

 
170

 
(13,316
)
 
339,834

Residential mortgage-backed securities
 
1,008,235

 
1,844

 
(20,626
)
 
989,453

Municipal securities
 
74,942

 
251

 
(1,117
)
 
74,076

Non-agency residential mortgage-backed securities:
 
 
 
 
 
 
 
 

Investment grade (1)
 
8,547

 
—

 
(143
)
 
8,404

Corporate debt securities:
 
 
 
 
 
 
 
 

Investment grade (1)
 
36,379

 
178

 
(699
)
 
35,858

Foreign bonds:
 
 
 
 
 
 
 


Investment grade (1) (2)
 
505,364

 
—

 
(26,419
)
 
478,945

Total available-for-sale investment securities
 
$
2,890,893

 
$
2,711

 
$
(82,188
)
 
$
2,811,416

 
 
 
 
 
 
 
As of December 31, 2017
($ in thousands)
 
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 (3)
 
31,887

 
—

 
(545
)
 
31,342

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

 
$
5,013

 
$
(58,328
)
 
$
3,016,752

 
 
 
 
 
 
 
 
 
(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 $448.5 million and $456.1 million of multilateral development bank bonds as of March 31, 2018 and December 31, 2017, respectively.
(3)
Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.
Schedule of gross unrealized losses and related fair value of investment securities
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 March 31, 2018 and December 31, 2017:
 
 
 
As of March 31, 2018
($ in thousands)
 
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
 
$
170,103

 
$
(3,130
)
 
$
457,952

 
$
(13,803
)
 
$
628,055

 
$
(16,933
)
U.S. government agency and U.S. government sponsored enterprise debt securities
 
133,861

 
(2,157
)
 
86,549

 
(778
)
 
220,410

 
(2,935
)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Commercial mortgage-backed securities
 
117,057

 
(3,255
)
 
192,874

 
(10,061
)
 
309,931

 
(13,316
)
Residential mortgage-backed securities
 
461,197

 
(8,362
)
 
339,157

 
(12,264
)
 
800,354

 
(20,626
)
Municipal securities
 
24,618

 
(671
)
 
8,323

 
(446
)
 
32,941

 
(1,117
)
Non-agency residential mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Investment grade
 
8,404

 
(143
)
 
—

 
—

 
8,404

 
(143
)
Corporate debt securities:
 
 

 
 

 
 

 
 

 
 

 
 

Investment grade
 
—

 
—

 
10,742

 
(699
)
 
10,742

 
(699
)
Foreign bonds:
 
 
 
 
 
 
 
 
 
 
 
 
Investment grade
 
130,436

 
(5,010
)
 
348,510

 
(21,409
)
 
478,946

 
(26,419
)
Total available-for-sale investment securities
 
$
1,045,676

 
$
(22,728
)
 
$
1,444,107

 
$
(59,460
)
 
$
2,489,783

 
$
(82,188
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2017
($ in thousands)
 
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(1)
 
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
)
 

(1)
Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities, at fair value to Investments in tax credit and other investments, net, with changes in fair value recorded through net income.
Schedule of the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities
The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three months ended March 31, 2018 and 2017:
 
($ in thousands)
 
Three Months Ended March 31,
 
2018
 
2017
Proceeds from sales
 
$
214,790

 
$
302,656

Gross realized gains
 
$
2,129

 
$
2,474

Related tax expense
 
$
628

 
$
1,040

 
Schedule of maturities of available-for-sale investment securities
The following table presents the scheduled maturities of available-for-sale investment securities as of March 31, 2018:
 
($ in thousands)
 
Amortized
Cost
 
Fair
Value
Due within one year
 
$
573,138

 
$
549,190

Due after one year through five years
 
818,412

 
796,717

Due after five years through ten years
 
188,149

 
184,944

Due after ten years
 
1,311,194

 
1,280,565

Total available-for-sale investment securities
 
$
2,890,893

 
$
2,811,416

 
Schedule of restricted equity securities
The following table presents the restricted equity securities as of March 31, 2018 and December 31, 2017:
 
($ in thousands)
 
March 31, 2018
 
December 31, 2017
FRB stock
 
$
56,537

 
$
56,271

FHLB stock
 
17,250

 
17,250

Total
 
$
73,787

 
$
73,521