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Securities (Tables)
 6 Months Ended
Jun. 30, 2019
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 as of June 30, 2019 and December 31, 2018:
 
($ in thousands)
 
June 30, 2019
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
329,209

 
$
—

 
$
(2,674
)
 
$
326,535

U.S. government agency and U.S. government sponsored enterprise debt securities
 
239,732

 
2,252

 
(17
)
 
241,967

U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
471,189

 
7,956

 
(4,313
)
 
474,832

Residential mortgage-backed securities
 
836,757

 
8,222

 
(1,405
)
 
843,574

Municipal securities
 
86,776

 
791

 
(38
)
 
87,529

Non-agency mortgage-backed securities:
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
68,675

 
1,878

 
(4
)
 
70,549

Residential mortgage-backed securities
 
24,534

 
19

 
(14
)
 
24,539

Corporate debt securities
 
11,250

 
—

 
(94
)
 
11,156

Foreign bonds
 
489,392

 
111

 
(5,087
)
 
484,416

Asset-backed securities
 
27,991

 
—

 
(175
)
 
27,816

Total available-for-sale investment securities
 
$
2,585,505

 
$
21,229

 
$
(13,821
)
 
$
2,592,913

 
 
($ in thousands)
 
December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available-for-sale investment securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
577,561

 
$
153

 
$
(12,899
)
 
$
564,815

U.S. government agency and U.S. government sponsored enterprise debt securities
 
219,485

 
382

 
(2,694
)
 
217,173

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


Commercial mortgage-backed securities
 
420,486

 
811

 
(12,694
)
 
408,603

Residential mortgage-backed securities
 
957,219

 
4,026

 
(14,552
)
 
946,693

Municipal securities
 
82,965

 
87

 
(1,032
)
 
82,020

Non-agency mortgage-backed securities:
 
 
 
 
 
 
 


Commercial mortgage-backed securities
 
25,826

 
226

 
—

 
26,052

Residential mortgage-backed securities
 
10,109

 
7

 
(185
)
 
9,931

Corporate debt securities
 
11,250

 
—

 
(381
)
 
10,869

Foreign bonds
 
489,378

 
—

 
(26,330
)
 
463,048

Asset-backed securities
 
12,621

 
22

 
—

 
12,643

Total available-for-sale investment securities
 
$
2,806,900

 
$
5,714

 
$
(70,767
)
 
$
2,741,847

 
 
 
 
 
 
 
 
 
Schedule of fair value and associated gross unrealized losses of available-for-sale investment securities
The following tables present the fair value and the associated gross unrealized losses of the Company’s available-for-sale investment securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position, as of June 30, 2019 and December 31, 2018:
 
($ in thousands)
 
June 30, 2019
 
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
 
$
—

 
$
—

 
$
326,535

 
$
(2,674
)
 
$
326,535

 
$
(2,674
)
U.S. government agency and U.S. government sponsored enterprise debt securities
 
22,442

 
(17
)
 
—

 
—

 
22,442

 
(17
)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
10,210

 
(81
)
 
208,330

 
(4,232
)
 
218,540

 
(4,313
)
Residential mortgage-backed securities
 
11,679

 
(123
)
 
145,595

 
(1,282
)
 
157,274

 
(1,405
)
Municipal securities
 
4,890

 
(10
)
 
9,950

 
(28
)
 
14,840

 
(38
)
Non-agency mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
7,916

 
(4
)
 
—

 
—

 
7,916

 
(4
)
Residential mortgage-backed securities
 
—

 
—

 
3,917

 
(14
)
 
3,917

 
(14
)
Corporate debt securities
 
1,244

 
(6
)
 
9,912

 
(88
)
 
11,156

 
(94
)
Foreign bonds
 
14,349

 
(94
)
 
369,956

 
(4,993
)
 
384,305

 
(5,087
)
Asset-backed securities
 
27,816

 
(175
)
 
—

 
—

 
27,816

 
(175
)
Total available-for-sale investment securities
 
$
100,546

 
$
(510
)
 
$
1,074,195

 
$
(13,311
)
 
$
1,174,741

 
$
(13,821
)
 
 
($ in thousands)
 
December 31, 2018
 
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
 
$
—

 
$
—

 
$
516,520

 
$
(12,899
)
 
$
516,520

 
$
(12,899
)
U.S. government agency and U.S. government sponsored enterprise debt securities
 
22,755

 
(238
)
 
159,814

 
(2,456
)
 
182,569

 
(2,694
)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed securities
 
26,886

 
(245
)
 
274,666

 
(12,449
)
 
301,552

 
(12,694
)
Residential mortgage-backed securities
 
75,675

 
(491
)
 
653,660

 
(14,061
)
 
729,335

 
(14,552
)
Municipal securities
 
9,458

 
(104
)
 
30,295

 
(928
)
 
39,753

 
(1,032
)
Non-agency mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
 
3,067

 
(19
)
 
3,949

 
(166
)
 
7,016

 
(185
)
Corporate debt securities
 
10,869

 
(381
)
 
—

 
—

 
10,869

 
(381
)
Foreign bonds
 
14,418

 
(40
)
 
448,630

 
(26,290
)
 
463,048

 
(26,330
)
Total available-for-sale investment securities
 
$
163,128

 
$
(1,518
)
 
$
2,087,534

 
$
(69,249
)
 
$
2,250,662

 
$
(70,767
)
 
Schedule of the proceeds, gross realized gains, 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 and six months ended June 30, 2019 and 2018:
 
($ in thousands)
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Proceeds from sales
 
$
223,763

 
$
42,085

 
$
375,102

 
$
256,875

Gross realized gains
 
$
1,447

 
$
210

 
$
3,008

 
$
2,339

Related tax expense
 
$
428

 
$
62

 
$
889

 
$
690

 
Schedule of contractual maturities of available-for-sale investment securities
The following table presents the contractual maturities of available-for-sale investment securities as of June 30, 2019:
 
($ in thousands)
 
Amortized Cost
 
Fair Value
Due within one year
 
$
586,072

 
$
581,305

Due after one year through five years
 
432,912

 
430,486

Due after five years through ten years
 
193,117

 
196,457

Due after ten years
 
1,373,404

 
1,384,665

Total available-for-sale investment securities
 
$
2,585,505

 
$
2,592,913

 
Schedule of restricted equity securities The following table presents the restricted equity securities as of June 30, 2019 and December 31, 2018:
 
($ in thousands)
 
June 30, 2019
 
December 31, 2018
FRB stock
 
$
57,843

 
$
56,819

FHLB stock
 
20,250

 
17,250

Total restricted equity securities
 
$
78,093

 
$
74,069