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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities Held to Maturity
The amortized cost, gross unrealized gains and losses and fair value of securities held to maturity at June 30, 2018 and December 31, 2017 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
June 30, 2018
 
 
 
 
 
 
 
U.S. Treasury securities
$
138,598

 
$
3,007

 
$
—

 
$
141,605

U.S. government agency securities
9,447

 
21

 
(188
)
 
9,280

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
355,219

 
4,940

 
(5,862
)
 
354,297

Municipal bonds
260,432

 
3,634

 
(1,577
)
 
262,489

Total obligations of states and political subdivisions
615,651

 
8,574

 
(7,439
)
 
616,786

Residential mortgage-backed securities
1,185,165

 
2,493

 
(41,208
)
 
1,146,450

Trust preferred securities
49,833

 
78

 
(6,577
)
 
43,334

Corporate and other debt securities
31,500

 
119

 
(292
)
 
31,327

Total investment securities held to maturity
$
2,030,194

 
$
14,292

 
$
(55,704
)
 
$
1,988,782

December 31, 2017
 
 
 
 
 
 
 
U.S. Treasury securities
$
138,676

 
$
6,581

 
$
—

 
$
145,257

U.S. government agency securities
9,859

 
122

 
—

 
9,981

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
244,272

 
7,083

 
(1,653
)
 
249,702

Municipal bonds
221,606

 
6,199

 
(28
)
 
227,777

Total obligations of states and political subdivisions
465,878

 
13,282

 
(1,681
)
 
477,479

Residential mortgage-backed securities
1,131,945

 
4,842

 
(18,743
)
 
1,118,044

Trust preferred securities
49,824

 
60

 
(9,796
)
 
40,088

Corporate and other debt securities
46,509

 
532

 
(270
)
 
46,771

Total investment securities held to maturity
$
1,842,691

 
$
25,419

 
$
(30,490
)
 
$
1,837,620
Age of Unrealized Losses and Fair Value of Related Securities Held to Maturity
The age of unrealized losses and fair value of related securities held to maturity at June 30, 2018 and December 31, 2017 were as follows: 
 
Less than
Twelve Months
 
More than
Twelve Months
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
(in thousands)
June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
6,527

 
$
(188
)
 
$
—

 
$
—

 
$
6,527

 
$
(188
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
125,371

 
(2,503
)
 
46,899

 
(3,359
)
 
172,270

 
(5,862
)
Municipal bonds
87,785

 
(1,546
)
 
533

 
(31
)
 
88,318

 
(1,577
)
Total obligations of states and political subdivisions
213,156

 
(4,049
)
 
47,432

 
(3,390
)
 
260,588

 
(7,439
)
Residential mortgage-backed securities
425,381

 
(12,139
)
 
555,355

 
(29,069
)
 
980,736

 
(41,208
)
Trust preferred securities
—

 
—

 
29,903

 
(6,577
)
 
29,903

 
(6,577
)
Corporate and other debt securities
10,478

 
(22
)
 
4,731

 
(270
)
 
15,209

 
(292
)
Total
$
655,542

 
$
(16,398
)
 
$
637,421

 
$
(39,306
)
 
$
1,292,963

 
$
(55,704
)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
$
6,342

 
$
(50
)
 
$
53,034

 
$
(1,603
)
 
$
59,376

 
$
(1,653
)
Municipal bonds
4,644

 
(25
)
 
561

 
(3
)
 
5,205

 
(28
)
Total obligations of states and political subdivisions
10,986

 
(75
)
 
53,595

 
(1,606
)
 
64,581

 
(1,681
)
Residential mortgage-backed securities
344,216

 
(2,357
)
 
570,969

 
(16,386
)
 
915,185

 
(18,743
)
Trust preferred securities
—

 
—

 
38,674

 
(9,796
)
 
38,674

 
(9,796
)
Corporate and other debt securities
9,980

 
(270
)
 
—

 
—

 
9,980

 
(270
)
Total
$
365,182

 
$
(2,702
)
 
$
663,238

 
$
(27,788
)
 
$
1,028,420

 
$
(30,490
)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at June 30, 2018 are set forth in the table below. Maturities may differ from contractual maturities in residential mortgage-backed securities because the mortgages underlying the securities may be prepaid without any penalties. Therefore, residential mortgage-backed securities are not included in the maturity categories in the following summary.  
 
June 30, 2018
 
Amortized
Cost
 
Fair
Value
 
(in thousands)
Due in one year
$
13,524

 
$
13,580

Due after one year through five years
223,219

 
226,330

Due after five years through ten years
321,954

 
329,369

Due after ten years
286,332

 
273,053

Residential mortgage-backed securities
1,185,165

 
1,146,450

Total investment securities held to maturity
$
2,030,194

 
$
1,988,782
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities Available for Sale
The amortized cost, gross unrealized gains and losses and fair value of securities available for sale at June 30, 2018 and December 31, 2017 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
June 30, 2018
 
 
 
 
 
 
 
U.S. Treasury securities
$
50,986

 
$
—

 
$
(2,319
)
 
$
48,667

U.S. government agency securities
39,212

 
34

 
(1,240
)
 
38,006

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
110,580

 
52

 
(2,636
)
 
107,996

Municipal bonds
104,922

 
281

 
(1,670
)
 
103,533

Total obligations of states and political subdivisions
215,502

 
333

 
(4,306
)
 
211,529

Residential mortgage-backed securities
1,525,041

 
1,330

 
(48,525
)
 
1,477,846

Trust preferred securities
2,583

 
—

 
(304
)
 
2,279

Corporate and other debt securities
55,629

 
219

 
(708
)
 
55,140

Total investment securities available for sale
$
1,888,953

 
$
1,916

 
$
(57,402
)
 
$
1,833,467

December 31, 2017
 
 
 
 
 
 
 
U.S. Treasury securities
$
50,997

 
$
—

 
$
(1,355
)
 
$
49,642

U.S. government agency securities
42,384

 
158

 
(37
)
 
42,505

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
38,435

 
158

 
(374
)
 
38,219

Municipal bonds
74,752

 
477

 
(564
)
 
74,665

Total obligations of states and political subdivisions
113,187

 
635

 
(938
)
 
112,884

Residential mortgage-backed securities
1,239,534

 
2,423

 
(18,662
)
 
1,223,295

Trust preferred securities
3,726

 
—

 
(512
)
 
3,214

Corporate and other debt securities
50,701

 
623

 
(160
)
 
51,164

Equity securities
10,505

 
1,190

 
(494
)
 
11,201

Total investment securities available for sale
$
1,511,034

 
$
5,029

 
$
(22,158
)
 
$
1,493,905
Age of Unrealized Losses and Fair Value of Related Securities Available for Sale
The age of unrealized losses and fair value of related securities available for sale at June 30, 2018 and December 31, 2017 were as follows: 
 
Less than
Twelve Months
 
More than
Twelve Months
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(in thousands)
June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
901

 
$
(13
)
 
$
47,766

 
$
(2,306
)
 
$
48,667

 
$
(2,319
)
U.S. government agency securities
30,485

 
(1,240
)
 
—

 
—

 
30,485

 
(1,240
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
96,617

 
(2,301
)
 
8,041

 
(335
)
 
104,658

 
(2,636
)
Municipal bonds
69,301

 
(1,251
)
 
12,010

 
(419
)
 
81,311

 
(1,670
)
Total obligations of states and political subdivisions
165,918

 
(3,552
)
 
20,051

 
(754
)
 
185,969

 
(4,306
)
Residential mortgage-backed securities
875,444

 
(21,543
)
 
553,585

 
(26,982
)
 
1,429,029

 
(48,525
)
Trust preferred securities
—

 
—

 
2,279

 
(304
)
 
2,279

 
(304
)
Corporate and other debt securities
22,622

 
(460
)
 
14,756

 
(248
)
 
37,378

 
(708
)
Total
$
1,095,370

 
$
(26,808
)
 
$
638,437

 
$
(30,594
)
 
$
1,733,807

 
$
(57,402
)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
916

 
$
(2
)
 
$
48,726

 
$
(1,353
)
 
$
49,642

 
$
(1,355
)
U.S. government agency securities
31,177

 
(37
)
 
—

 
—

 
31,177

 
(37
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
13,337

 
(131
)
 
7,792

 
(243
)
 
21,129

 
(374
)
Municipal bonds
31,669

 
(256
)
 
12,133

 
(308
)
 
43,802

 
(564
)
Total obligations of states and political subdivisions
45,006

 
(387
)
 
19,925

 
(551
)
 
64,931

 
(938
)
Residential mortgage-backed securities
406,940

 
(2,461
)
 
599,167

 
(16,201
)
 
1,006,107

 
(18,662
)
Trust preferred securities
—

 
—

 
3,214

 
(512
)
 
3,214

 
(512
)
Corporate and other debt securities
5,855

 
(45
)
 
15,115

 
(115
)
 
20,970

 
(160
)
Equity securities
—

 
—

 
5,150

 
(494
)
 
5,150

 
(494
)
Total
$
489,894

 
$
(2,932
)
 
$
691,297

 
$
(19,226
)
 
$
1,181,191

 
$
(22,158
)
Contractual Maturities of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at June 30, 2018 are set forth in the following table. Maturities may differ from contractual maturities in residential mortgage-backed securities because the mortgages underlying the securities may be prepaid without any penalties. Therefore, residential mortgage-backed securities are not included in the maturity categories in the following summary.
 
June 30, 2018
 
Amortized
Cost
 
Fair
Value
 
(in thousands)
Due in one year
$
18,801

 
$
18,876

Due after one year through five years
127,790

 
124,100

Due after five years through ten years
80,582

 
79,923

Due after ten years
136,739

 
132,723

Residential mortgage-backed securities
1,525,041

 
1,477,845

Total investment securities available for sale
$
1,888,953

 
$
1,833,467