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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
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, 2019 and 2018 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in thousands)
December 31, 2019
 
 
 
 
 
 
 
U.S. Treasury securities
$
50,952

 
$
12

 
$
(21
)
 
$
50,943

U.S. government agency securities
28,982

 
280

 
(19
)
 
29,243

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
78,116

 
540

 
(83
)
 
78,573

Municipal bonds
90,662

 
902

 
(86
)
 
91,478

Total obligations of states and political subdivisions
168,778

 
1,442

 
(169
)
 
170,051

Residential mortgage-backed securities
1,248,814

 
11,234

 
(5,262
)
 
1,254,786

Corporate and other debt securities
61,261

 
628

 
(111
)
 
61,778

Total investment securities available for sale
$
1,558,787

 
$
13,596

 
$
(5,582
)
 
$
1,566,801

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
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, 2019 and 2018 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, 2019
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
25,019

 
$
(21
)
 
$
—

 
$
—

 
$
25,019

 
$
(21
)
U.S. government agency securities
—

 
—

 
1,783

 
(19
)
 
1,783

 
(19
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
18,540

 
(21
)
 
8,755

 
(62
)
 
27,295

 
(83
)
Municipal bonds
—

 
—

 
13,177

 
(86
)
 
13,177

 
(86
)
Total obligations of states and political subdivisions
18,540

 
(21
)
 
21,932

 
(148
)
 
40,472

 
(169
)
Residential mortgage-backed securities
240,412

 
(1,194
)
 
282,798

 
(4,068
)
 
523,210

 
(5,262
)
Corporate and other debt securities
5,139

 
(111
)
 
—

 
—

 
5,139

 
(111
)
Total
$
289,110

 
$
(1,347
)
 
$
306,513

 
$
(4,235
)
 
$
595,623

 
$
(5,582
)
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
)
Contractual Maturities of Investments Securities Available for Sale
The contractual maturities of investment debt securities available for sale at December 31, 2019 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, 2019
 
Amortized Cost
 
Fair Value
 
(in thousands)
Due in one year
$
19,554

 
$
19,611

Due after one year through five years
110,337

 
110,801

Due after five years through ten years
90,297

 
91,232

Due after ten years
89,785

 
90,371

Residential mortgage-backed securities
1,248,814

 
1,254,786

Total investment securities available for sale
$
1,558,787

 
$
1,566,801
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 debt securities held to maturity at December 31, 2019 and 2018 were as follows: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
December 31, 2019
 
 
 
 
 
 
 
U.S. Treasury securities
$
138,352

 
$
5,761

 
$
—

 
$
144,113

U.S. government agency securities
7,345

 
58

 
(41
)
 
7,362

Obligations of states and political subdivisions:
 
 
 
 
 
 
 
Obligations of states and state agencies
297,454

 
7,745

 
(529
)
 
304,670

Municipal bonds
203,251

 
5,696

 
(10
)
 
208,937

Total obligations of states and political subdivisions
500,705

 
13,441

 
(539
)
 
513,607

Residential mortgage-backed securities
1,620,119

 
14,803

 
(5,350
)
 
1,629,572

Trust preferred securities
37,324

 
39

 
(5,981
)
 
31,382

Corporate and other debt securities
32,250

 
454

 
(20
)
 
32,684

Total investment securities held to maturity
$
2,336,095

 
$
34,556

 
$
(11,931
)
 
$
2,358,720

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
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, 2019 and 2018 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, 2019
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
5,183

 
$
(41
)
 
$
—

 
$
—

 
$
5,183

 
$
(41
)
Obligations of states and political subdivisions:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and state agencies
11,178

 
(55
)
 
32,397

 
(474
)
 
43,575

 
(529
)
Municipal bonds
—

 
—

 
798

 
(10
)
 
798

 
(10
)
Total obligations of states and political subdivisions
11,178

 
(55
)
 
33,195

 
(484
)
 
44,373

 
(539
)
Residential mortgage-backed securities
307,885

 
(1,387
)
 
254,915

 
(3,963
)
 
562,800

 
(5,350
)
Trust preferred securities
—

 
—

 
29,990

 
(5,981
)
 
29,990

 
(5,981
)
Corporate and other debt securities
—

 
—

 
4,980

 
(20
)
 
4,980

 
(20
)
Total
$
324,246

 
$
(1,483
)
 
$
323,080

 
$
(10,448
)
 
$
647,326

 
$
(11,931
)
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
)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at December 31, 2019 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, 2019
 
Amortized Cost
 
Fair Value
 
(in thousands)
Due in one year
$
96,230

 
$
97,223

Due after one year through five years
170,615

 
176,005

Due after five years through ten years
216,437

 
226,086

Due after ten years
232,694

 
229,834

Residential mortgage-backed securities
1,620,119

 
1,629,572

Total investment securities held to maturity
$
2,336,095

 
$
2,358,720
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, 2019, 2018 and 2017 were as follows:
 
2019
 
2018
 
2017
 
(in thousands)
Sales transactions:
 
 
 
 
 
Gross gains
$
—

 
$
1,769

 
$
—

Gross losses
—

 
(3,881
)
 
(25
)
 
$
—

 
$
(2,112
)
 
$
(25
)
Maturities and other securities transactions:
 
 
 
 
 
Gross gains
$
67

 
$
42

 
$
43

Gross losses
(217
)
 
(272
)
 
(38
)
 
$
(150
)
 
$
(230
)
 
$
5

Net losses on securities transactions
$
(150
)
 
$
(2,342
)
 
$
(20
)