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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities Held to Maturity
The amortized cost, gross unrealized gains and losses and fair value of investment securities held to maturity at December 31, 2018 and 2017 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
December 31, 2018
 
 
 
 
 
 
 
U.S. Treasury securities
$
138,517

 
$
3,532

 
$
—

 
$
142,049

U.S. government agency securities
8,721

 
55

 
(135
)
 
8,641

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
341,702

 
4,332

 
(5,735
)
 
340,299

Municipal bonds
243,954

 
3,141

 
(1,361
)
 
245,734

Total obligations of states and political subdivisions
585,656

 
7,473

 
(7,096
)
 
586,033

Residential mortgage-backed securities
1,266,770

 
3,203

 
(34,368
)
 
1,235,605

Trust preferred securities
37,332

 
77

 
(5,923
)
 
31,486

Corporate and other debt securities
31,250

 
96

 
(217
)
 
31,129

Total investment securities held to maturity
$
2,068,246

 
$
14,436

 
$
(47,739
)
 
$
2,034,943

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 December 31, 2018 and 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)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
—

 
$
—

 
$
6,074

 
$
(135
)
 
$
6,074

 
$
(135
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
16,098

 
(266
)
 
138,437

 
(5,469
)
 
154,535

 
(5,735
)
Municipal bonds
3,335

 
(37
)
 
60,078

 
(1,324
)
 
63,413

 
(1,361
)
Total obligations of states and political subdivisions
19,433

 
(303
)
 
198,515

 
(6,793
)
 
217,948

 
(7,096
)
Residential mortgage-backed securities
72,240

 
(852
)
 
846,671

 
(33,516
)
 
918,911

 
(34,368
)
Trust preferred securities
—

 
—

 
30,055

 
(5,923
)
 
30,055

 
(5,923
)
Corporate and other debt securities
9,948

 
(52
)
 
4,835

 
(165
)
 
14,783

 
(217
)
Total
$
101,621

 
$
(1,207
)
 
$
1,086,150

 
$
(46,532
)
 
$
1,187,771

 
$
(47,739
)
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 December 31, 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. 
 
December 31, 2018
 
Amortized Cost
 
Fair Value
 
(in thousands)
Due in one year
$
21,418

 
$
21,459

Due after one year through five years
274,389

 
278,051

Due after five years through ten years
260,835

 
267,813

Due after ten years
244,834

 
232,015

Residential mortgage-backed securities
1,266,770

 
1,235,605

Total investment securities held to maturity
$
2,068,246

 
$
2,034,943
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities Available for Sale
The amortized cost, gross unrealized gains and losses and fair value of investment securities available for sale at December 31, 2018 and 2017 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in thousands)
December 31, 2018
 
 
 
 
 
 
 
U.S. Treasury securities
$
50,975

 
$
—

 
$
(1,669
)
 
$
49,306

U.S. government agency securities
36,844

 
71

 
(638
)
 
36,277

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
100,777

 
18

 
(3,682
)
 
97,113

Municipal bonds
101,207

 
209

 
(1,437
)
 
99,979

Total obligations of states and political subdivisions
201,984

 
227

 
(5,119
)
 
197,092

Residential mortgage-backed securities
1,469,059

 
1,484

 
(40,761
)
 
1,429,782

Corporate and other debt securities
37,542

 
213

 
(668
)
 
37,087

Total investment securities available for sale
$
1,796,404

 
$
1,995

 
$
(48,855
)
 
$
1,749,544

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
The age of unrealized losses and fair value of related securities available for sale at December 31, 2018 and 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)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
—

 
$
—

 
$
49,306

 
$
(1,669
)
 
$
49,306

 
$
(1,669
)
U.S. government agency securities
2,120

 
(20
)
 
26,775

 
(618
)
 
28,895

 
(638
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
17,560

 
(95
)
 
75,718

 
(3,587
)
 
93,278

 
(3,682
)
Municipal bonds
5,018

 
(106
)
 
70,286

 
(1,331
)
 
75,304

 
(1,437
)
Total obligations of states and political subdivisions
22,578

 
(201
)
 
146,004

 
(4,918
)
 
168,582

 
(5,119
)
Residential mortgage-backed securities
119,645

 
(668
)
 
1,221,942

 
(40,093
)
 
1,341,587

 
(40,761
)
Corporate and other debt securities
12,339

 
(161
)
 
12,397

 
(507
)
 
24,736

 
(668
)
Total
$
156,682

 
$
(1,050
)
 
$
1,456,424

 
$
(47,805
)
 
$
1,613,106

 
$
(48,855
)
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 Investments Securities Available for Sale
The contractual maturities of investments securities available for sale at December 31, 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. 
 
December 31, 2018
 
Amortized Cost
 
Fair Value
 
(in thousands)
Due in one year
$
4,666

 
$
4,643

Due after one year through five years
125,825

 
123,051

Due after five years through ten years
78,305

 
76,640

Due after ten years
118,549

 
115,428

Residential mortgage-backed securities
1,469,059

 
1,429,782

Total investment securities available for sale
$
1,796,404

 
$
1,749,544
Realized Gains and Losses
Gross gains and losses realized on sales, maturities and other securities transactions included in earnings for the years ended December 31, 2018, 2017 and 2016 were as follows:
 
2018
 
2017
 
2016
 
(in thousands)
Sales transactions:
 
 
 
 
 
Gross gains
$
1,769

 
$
—

 
$
271

Gross losses
(3,881
)
 
(25
)
 
(58
)
 
$
(2,112
)
 
$
(25
)
 
$
213

Maturities and other securities transactions:
 
 
 
 
 
Gross gains
$
42

 
$
43

 
$
615

Gross losses
(272
)
 
(38
)
 
(51
)
 
$
(230
)
 
$
5

 
$
564

(Losses) gains on securities transactions, net
$
(2,342
)
 
$
(20
)
 
$
777