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Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]  
Securities Available for Sale
The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale:
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
December 31, 2019
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations (1)
 
$
2,864,949

 
$
47,223

 
$
(19,222
)
 
$
2,892,950

Other asset-backed securities (1)
 
194,563

 
2,476

 
(989
)
 
196,050

State and municipal securities
 
478,366

 
10,660

 
(224
)
 
488,802

U.S. government agency and government-sponsored enterprise securities
 
165,218

 
3,127

 
(5
)
 
168,340

Total
 
$
3,703,096

 
$
63,486

 
$
(20,440
)
 
$
3,746,142

December 31, 2018
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations (1)
 
$
2,045,728

 
$
8,473

 
$
(40,846
)
 
$
2,013,355

Other asset-backed securities (1)
 
176,793

 
763

 
(2,621
)
 
174,935

State and municipal securities
 
579,755

 
2,328

 
(7,760
)
 
574,323

U.S. government agency and government-sponsored enterprise securities
 
408,088

 
1,235

 
(4,736
)
 
404,587

U.S. government securities
 
251

 
—

 
(3
)
 
248

Total
 
$
3,210,615

 
$
12,799

 
$
(55,966
)
 
$
3,167,448


__________
(1) Beginning in 2019, other asset-backed securities were presented separately in this table. Prior period amounts that were previously reported in U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations have been reclassified to conform to current period presentation.
Schedule of gross realized gains and losses on sales and calls of securities available for sale [Table Text Block]
The following table provides the proceeds and both gross realized gains and losses on the sales and calls of debt securities available for sale as well as other securities gains and losses for the periods indicated:
 
 
Years Ended December 31,
 
 
2019
 
2018
 
2017
 
 
(in thousands)
Proceeds from sales and calls of debt securities available for sale
 
$
259,554

 
$
32,330

 
$
30,403

 
 
 
 
 
 
 
Gross realized gains from sales of debt securities available for sale
 
$
3,357

 
$
235

 
$
111

Gross realized losses from sales of debt securities available for sale
 
(1,225
)
 
(129
)
 
(122
)
Other securities losses, net (1)
 
—

 
(195
)
 
—

Investment securities gains (losses), net
 
$
2,132

 
$
(89
)
 
$
(11
)
__________
(1) Other securities losses, net includes net unrealized loss activity associated with equity securities.
Schedule of Contractual Maturities of Investment Securities Available for Sale
The scheduled contractual maturities of debt securities available for sale at December 31, 2019 are presented as follows:
 
 
December 31, 2019
 
 
Amortized Cost
 
Fair Value
 
 
(in thousands)
Due within one year
 
$
77,363

 
$
77,538

Due after one year through five years
 
416,556

 
421,363

Due after five years through ten years
 
2,007,225

 
2,041,751

Due after ten years
 
1,201,952

 
1,205,490

Total debt securities available for sale
 
$
3,703,096

 
$
3,746,142
Schedule of Securities pledged as collateral [Table Text Block]
The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
 
 
December 31,
 
 
2019
 
2018
 
 
(in thousands)
To secure public funds
 
$
323,055

 
$
276,343

To secure borrowings
 
111,488

 
52,303

Other securities pledged
 
154,030

 
138,492

Total securities pledged as collateral
 
$
588,573

 
$
467,138
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses
The following tables show the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2019 and 2018:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
December 31, 2019
 
(in thousands)
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations (1)
 
$
1,055,903

 
$
(12,424
)
 
$
491,539

 
$
(6,798
)
 
$
1,547,442

 
(19,222
)
Other asset-backed securities (1)
 
89,508

 
(880
)
 
6,799

 
(109
)
 
96,307

 
(989
)
State and municipal securities
 
12,363

 
(142
)
 
12,587

 
(82
)
 
24,950

 
(224
)
U.S. government agency and government-sponsored enterprise securities
 
—

 
—

 
10,495

 
(5
)
 
10,495

 
(5
)
Total
 
$
1,157,774

 
$
(13,446
)
 
$
521,420

 
$
(6,994
)
 
$
1,679,194

 
$
(20,440
)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations (1)
 
$
114,551

 
$
(750
)
 
$
1,207,020

 
$
(40,096
)
 
$
1,321,571

 
$
(40,846
)
Other asset-backed securities (1)
 
40,071

 
(222
)
 
94,367

 
(2,399
)
 
134,438

 
(2,621
)
State and municipal securities
 
106,292

 
(581
)
 
280,496

 
(7,179
)
 
386,788

 
(7,760
)
U.S. government agency and government-sponsored enterprise securities
 
15,392

 
(45
)
 
291,435

 
(4,691
)
 
306,827

 
(4,736
)
U.S. government securities
 
—

 
—

 
247

 
(3
)
 
247

 
(3
)
Total
 
$
276,306

 
$
(1,598
)
 
$
1,873,565

 
$
(54,368
)
 
$
2,149,871

 
$
(55,966
)
__________
(1) Beginning in 2019, other asset-backed securities were presented separately in this table. Prior period amounts that were previously reported in U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations have been reclassified to conform to current period presentation.