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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 3,688,195 | $ 4,858,544
Gross Unrealized Gains | 22,475 | 88,336
Gross Unrealized Losses | 140,947 | 32,686
Fair Value | 3,569,723 | 4,914,194
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 83,308 |
Due in one year to five years | 161,633 |
Due in five years to ten years | 392,289 |
Due after ten years | 1,262,669 |
Mortgage-backed securities | 1,611,929 |
Asset-backed securities | 176,367 |
Amortized Cost | 3,688,195 | 4,858,544
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 83,147 |
Due in one year to five years | 164,323 |
Due in five years to ten years | 386,656 |
Due after ten years | 1,238,654 |
Mortgage-backed securities | 1,530,564 |
Asset-backed securities | 166,379 |
Fair Value | 3,569,723 | 4,914,194
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 2,567,492 | 1,156,119
Gross Unrealized Gains | 5,803 | 33,052
Gross Unrealized Losses | 140,641 | 1,122
Fair Value | 2,432,654 | 1,188,049
Allowance for credit losses - securities held-to-maturity | (1,106) | (161)
HeldToMaturitySecurities, net of allowance for credit losses | 2,566,386 | 1,155,958
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year or less | 1,971 |
Due in one year to five years | 277,233 |
Due in five years to ten years | 33,474 |
Due after ten years | 1,730,046 |
Mortgage-backed securities | 374,692 |
Asset-backed securities | 150,076 |
Amortized Cost | 2,567,492 | 1,156,119
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 1,969 |
Due in one year to five years | 264,682 |
Due in five years to ten years | 31,634 |
Due after ten years | 1,638,035 |
Mortgage-backed securities | 353,880 |
Asset-backed securities | 142,454 |
Fair Value | 2,432,654 | 1,188,049
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 81,314 | 194,490
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 150 | 881
Fair Value | 81,164 | 193,609
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 81,314 | 194,490
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 81,164 | 193,609
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 93,039 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 3,778 |
Fair Value | 89,261 |
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 93,039 |
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 89,261 |
U.S. Government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 444,161 | 634,611
Gross Unrealized Gains | 2,018 | 2,359
Gross Unrealized Losses | 16,231 | 4,961
Fair Value | 429,948 | 632,009
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 444,161 | 634,611
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 429,948 | 632,009
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 213,854 | 11,920
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 10,753 | 37
Fair Value | 203,101 | 11,883
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 213,854 | 11,920
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 203,101 | 11,883
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,611,929 | 1,908,675
Gross Unrealized Gains | 2,574 | 29,874
Gross Unrealized Losses | 83,939 | 18,310
Fair Value | 1,530,564 | 1,920,239
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,611,929 | 1,908,675
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,530,564 | 1,920,239
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 374,692 | 106,555
Gross Unrealized Gains | 121 | 86
Gross Unrealized Losses | 20,933 | 196
Fair Value | 353,880 | 106,445
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 374,692 | 106,555
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 353,880 | 106,445
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,257,130 | 1,774,119
Gross Unrealized Gains | 16,644 | 52,961
Gross Unrealized Losses | 26,609 | 3,243
Fair Value | 1,247,165 | 1,823,837
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,257,130 | 1,774,119
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,247,165 | 1,823,837
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,726,629 | 1,037,644
Gross Unrealized Gains | 5,682 | 32,966
Gross Unrealized Losses | 97,222 | 889
Fair Value | 1,635,089 | 1,069,721
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 1,726,629 | 1,037,644
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,635,089 | 1,069,721
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 176,367 | 232,294
Gross Unrealized Gains | 0 | 60
Gross Unrealized Losses | 9,988 | 2,785
Fair Value | 166,379 | 229,569
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 176,367 | 232,294
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 166,379 | 229,569
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 150,076 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 7,622 |
Fair Value | 142,454 |
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 150,076 |
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 142,454 |
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 117,294 | 114,355
Gross Unrealized Gains | 1,239 | 3,082
Gross Unrealized Losses | 4,030 | 2,506
Fair Value | 114,503 | 114,931
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 117,294 | 114,355
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 114,503 | $ 114,931
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 9,202 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 333 |
Fair Value | 8,869 |
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 9,202 |
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 8,869 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27198-111563 + Details
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