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Securities - Summary of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,662,481 | $ 1,432,684
Fair Value | 2,630,414 | 1,453,132
Unrealized Gains | 10,595 | 22,963
Unrealized (Losses) | (42,662) | (2,515)
Securities held to maturity: |  |
Amortized Cost | 513,825 | 167,551
Fair Value | 511,699 | 170,734
Unrealized Gains | 3,540 | 3,348
Unrealized (Losses) | (5,666) | (165)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,951 | 70,016
Fair Value | 69,179 | 70,206
Unrealized Gains | 0 | 371
Unrealized (Losses) | (2,772) | (181)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,545,150 | 1,318,998
Fair Value | 2,514,805 | 1,337,706
Unrealized Gains | 9,489 | 20,832
Unrealized (Losses) | (39,834) | (2,124)
Securities held to maturity: |  |
Amortized Cost | 20,260 | 29,959
Fair Value | 20,845 | 30,900
Unrealized Gains | 585 | 941
Unrealized (Losses) | 0 | 0
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 45,380 | 43,670
Fair Value | 46,430 | 45,220
Unrealized Gains | 1,106 | 1,760
Unrealized (Losses) | (56) | (210)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 493,565 | 137,592
Fair Value | 490,854 | 139,834
Unrealized Gains | 2,955 | 2,407
Unrealized (Losses) | $ (5,666) | $ (165)

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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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