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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | $ 4,320,884 | $ 3,721,636 | $ 2,607,636
Available-for-Sale: Gross Unrealized Gains | 21,460 | 72,428 | 21,143
Available-for-Sale: Gross Unrealized Losses | (66,288) | (2,375) | (9,776)
Available-for-Sale: Fair Value | 4,276,056 | 3,791,689 | 2,619,003
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 4,694,780 | 3,262,727 | 3,042,294
Held-to-Maturity: Gross Unrealized Gains | 28,334 | 86,494 | 29,990
Held-to-Maturity: Gross Unrealized Losses | (76,495) | (528) | (9,402)
Held-to-Maturity: Fair Value | 4,646,619 | 3,348,693 | 3,062,882
Debt Securities Issued by the U.S. Treasury and Government Agencies |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 248,858 | 174,409 | 222,365
Available-for-Sale: Gross Unrealized Gains | 1,513 | 427 | 213
Available-for-Sale: Gross Unrealized Losses | (284) | (591) | (1,447)
Available-for-Sale: Fair Value | 250,087 | 174,245 | 221,131
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 131,495 | 7,500 | 274,375
Held-to-Maturity: Gross Unrealized Gains | 287 | 8 | 1,319
Held-to-Maturity: Gross Unrealized Losses | (643) | (8) | (31)
Held-to-Maturity: Fair Value | 131,139 | 7,500 | 275,663
Debt Securities Issued by States and Political Subdivisions |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 74,743 | 23,540 | 54,480
Available-for-Sale: Gross Unrealized Gains | 1,080 | 1,301 | 631
Available-for-Sale: Gross Unrealized Losses | (5) | (1) | (14)
Available-for-Sale: Fair Value | 75,818 | 24,840 | 55,097
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost |  | 33,763 | 54,811
Held-to-Maturity: Gross Unrealized Gains |  | 741 | 1,236
Held-to-Maturity: Fair Value |  | 34,504 | 56,047
Debt Securities Issued by Government-Sponsored Enterprises |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 1,758 | 985 | 22,128
Available-for-Sale: Gross Unrealized Gains | 33 | 77 | 19
Available-for-Sale: Gross Unrealized Losses | (11) | 0 | 0
Available-for-Sale: Fair Value | 1,780 | 1,062 | 22,147
Debt Securities Issued by Corporations |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 384,590 | 220,717 | 335,553
Available-for-Sale: Gross Unrealized Gains | 2,339 | 4,844 | 1,401
Available-for-Sale: Gross Unrealized Losses | (3,816) | (956) | (633)
Available-for-Sale: Fair Value | 383,113 | 224,605 | 336,321
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 20,316 | 12,031 | 14,975
Held-to-Maturity: Gross Unrealized Gains | 76 | 251 |
Held-to-Maturity: Gross Unrealized Losses | (249) |  | (138)
Held-to-Maturity: Fair Value | 20,143 | 12,282 | 14,837
Residential - Government Agencies |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 1,327,990 | 1,561,603 | 1,164,466
Available-for-Sale: Gross Unrealized Gains | 9,818 | 33,657 | 11,627
Available-for-Sale: Gross Unrealized Losses | (18,766) | (445) | (3,267)
Available-for-Sale: Fair Value | 1,319,042 | 1,594,815 | 1,172,826
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 1,774,394 | 917,459 | 1,067,416
Held-to-Maturity: Gross Unrealized Gains | 12,139 | 30,580 | 13,247
Held-to-Maturity: Gross Unrealized Losses | (30,621) | (29) | (5,348)
Held-to-Maturity: Fair Value | 1,755,912 | 948,010 | 1,075,315
Residential - U.S. Government-Sponsored Enterprises |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 2,127,781 | 1,497,353 | 584,272
Available-for-Sale: Gross Unrealized Gains | 4,792 | 21,254 | 4,363
Available-for-Sale: Gross Unrealized Losses | (42,247) | (324) | (1,874)
Available-for-Sale: Fair Value | 2,090,326 | 1,518,283 | 586,761
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 2,286,880 | 2,099,053 | 1,546,479
Held-to-Maturity: Gross Unrealized Gains | 15,508 | 51,735 | 13,871
Held-to-Maturity: Gross Unrealized Losses | (32,627) | (291) | (2,478)
Held-to-Maturity: Fair Value | 2,269,761 | 2,150,497 | 1,557,872
Commercial - Government Agencies |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 155,164 | 243,029 | 224,372
Available-for-Sale: Gross Unrealized Gains | 1,885 | 10,868 | 2,889
Available-for-Sale: Gross Unrealized Losses | (1,159) | (58) | (2,541)
Available-for-Sale: Fair Value | 155,890 | 253,839 | 224,720
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 481,695 | 192,921 | 84,238
Held-to-Maturity: Gross Unrealized Gains | 324 | 3,179 | 317
Held-to-Maturity: Gross Unrealized Losses | (12,355) | (200) | (1,407)
Held-to-Maturity: Fair Value | 469,664 | 195,900 | 83,148
Mortgage-Backed Securities |  |  |
Available-for-Sale: |  |  |
Available-for-Sale: Amortized Cost | 3,610,935 | 3,301,985 | 1,973,110
Available-for-Sale: Gross Unrealized Gains | 16,495 | 65,779 | 18,879
Available-for-Sale: Gross Unrealized Losses | (62,172) | (827) | (7,682)
Available-for-Sale: Fair Value | 3,565,258 | 3,366,937 | 1,984,307
Held-to-Maturity: |  |  |
Held-to-Maturity: Amortized Cost | 4,542,969 | 3,209,433 | 2,698,133
Held-to-Maturity: Gross Unrealized Gains | 27,971 | 85,494 | 27,435
Held-to-Maturity: Gross Unrealized Losses | (75,603) | (520) | (9,233)
Held-to-Maturity: Fair Value | $ 4,495,337 | $ 3,294,407 | $ 2,716,335

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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