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Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Year End Securities Held To Maturity And Available For Sale Year-end securities held to maturity and available for sale consisted of the following:
 
2019
 
2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Held to Maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
530,861

 
$
22

 
$
9,365

 
$
521,518

 
$
2,737

 
$
8

 
$
85

 
$
2,660

States and political subdivisions
1,497,644

 
28,909

 
896

 
1,525,657

 
1,101,820

 
11,525

 
552

 
1,112,793

Other
1,500

 
—

 
—

 
1,500

 
1,500

 
—

 
—

 
1,500

Total
$
2,030,005

 
$
28,931

 
$
10,261

 
$
2,048,675

 
$
1,106,057

 
$
11,533

 
$
637

 
$
1,116,953

Available for Sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
1,941,283

 
$
18,934

 
$
12,084

 
$
1,948,133

 
$
3,455,417

 
$
1,772

 
$
29,500

 
$
3,427,689

Residential mortgage-backed securities
2,176,275

 
32,608

 
1,289

 
2,207,594

 
823,208

 
13,079

 
6,547

 
829,740

States and political subdivisions
6,717,344

 
353,857

 
204

 
7,070,997

 
7,089,132

 
70,760

 
72,690

 
7,087,202

Other
42,867

 
—

 
—

 
42,867

 
42,690

 
—

 
—

 
42,690

Total
$
10,877,769

 
$
405,399

 
$
13,577

 
$
11,269,591

 
$
11,410,447

 
$
85,611

 
$
108,737

 
$
11,387,321
Year End Securities with Unrealized Losses, Segregated by Length of Impairment Year-end securities with unrealized losses, segregated by length of impairment, were as follows:
 
Less than 12 Months
 
More than 12 Months
 
Total
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
2019
 
 
 
 
 
 
 
 
 
 
 
Held to Maturity:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
519,099

 
$
9,361

 
$
408

 
$
4

 
$
519,507

 
$
9,365

States and political subdivisions
371,434

 
896

 
—

 
—

 
371,434

 
896

Total
$
890,533

 
$
10,257

 
$
408

 
$
4

 
$
890,941

 
$
10,261

Available for Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
636,999

 
$
12,070

 
$
199,980

 
$
14

 
$
836,979

 
$
12,084

Residential mortgage-backed securities
276,249

 
782

 
31,456

 
507

 
307,705

 
1,289

States and political subdivisions
59,678

 
204

 
—

 
—

 
59,678

 
204

Total
$
972,926

 
$
13,056

 
$
231,436

 
$
521

 
$
1,204,362

 
$
13,577


 
Less than 12 Months
 
More than 12 Months
 
Total
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
 
Estimated
Fair Value
 
Unrealized
Losses
2018
 
 
 
 
 
 
 
 
 
 
 
Held to Maturity:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
—

 
$
—

 
$
2,034

 
$
85

 
$
2,034

 
$
85

States and political subdivisions
205,686

 
541

 
5,952

 
11

 
211,638

 
552

Total
$
205,686

 
$
541

 
$
7,986

 
$
96

 
$
213,672

 
$
637

Available for Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
—

 
$
—

 
$
3,139,639

 
$
29,500

 
$
3,139,639

 
$
29,500

Residential mortgage-backed securities
152,682

 
205

 
213,982

 
6,342

 
366,664

 
6,547

States and political subdivisions
1,136,322

 
7,026

 
2,058,048

 
65,664

 
3,194,370

 
72,690

Total
$
1,289,004

 
$
7,231

 
$
5,411,669

 
$
101,506

 
$
6,700,673

 
$
108,737
Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity The amortized cost and estimated fair value of securities, excluding trading securities, at December 31, 2019 are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Residential mortgage-backed securities and equity securities are shown separately since they are not due at a single maturity date.
 
Held to Maturity
 
Available for Sale
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
12,773

 
$
12,847

 
$
508,575

 
$
509,404

Due after one year through five years
165,519

 
169,970

 
1,317,774

 
1,344,035

Due after five years through ten years
527,907

 
541,249

 
451,885

 
478,800

Due after ten years
792,945

 
803,091

 
6,380,393

 
6,686,891

Residential mortgage-backed securities
530,861

 
521,518

 
2,176,275

 
2,207,594

Equity securities
—

 
—

 
42,867

 
42,867

Total
$
2,030,005

 
$
2,048,675

 
$
10,877,769

 
$
11,269,591
Sales of Securities Available for Sale Sales of securities available for sale were as follows:
 
2019
 
2018
 
2017
Proceeds from sales
$
18,660,147

 
$
16,806,062

 
$
11,963,359

Gross realized gains
930

 
3

 
1

Gross realized losses
(637
)
 
(159
)
 
(4,942
)
Tax benefit (expense) related to securities gains/losses
(62
)
 
33

 
1,729
Premium Amortization and Discount Accretion Included in Income on Securities Premium amortization and discount accretion included in interest income on securities was as follows:
 
2019
 
2018
 
2017
Premium amortization
$
(120,785
)
 
$
(108,483
)
 
$
(97,841
)
Discount accretion
5,227

 
7,955

 
7,908

Net (premium amortization) discount accretion
$
(115,558
)
 
$
(100,528
)
 
$
(89,933
)
Year End Trading Account Securities, at Estimated Fair Value Year-end trading account securities, at estimated fair value, were as follows:
 
2019
 
2018
U.S. Treasury
$
24,298

 
$
21,928

States and political subdivisions
—

 
2,158

Total
$
24,298

 
$
24,086
Net Gains and Losses on Trading Account Securities
Net gains and losses on trading account securities were as follows:

2019

2018

2017
Net gain on sales transactions
$
2,173


$
1,816


$
1,408

Net mark-to-market gains (losses)
(176
)

105


(43
)
Net gain on trading account securities
$
1,997


$
1,921


$
1,365