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Securities - Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | $ 5,282,846 | $ 5,898,041
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 583 | 70,839
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (694,330) | (57,881)
Debt Securities, Available-for-sale | 4,589,099 | 5,910,999
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Total | 2,034,792 | 2,148,327
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 50
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (312,014) | (25,771)
Debt Securities, Held-to-maturity, Fair Value | 1,722,778 | 2,122,606
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 3,188,381 | 3,738,616
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 382 | 45,077
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (429,053) | (38,092)
Debt Securities, Available-for-sale | 2,759,710 | 3,745,601
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Total | 2,034,792 | 2,148,327
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 50
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (312,014) | (25,771)
Debt Securities, Held-to-maturity, Fair Value | 1,722,778 | 2,122,606
Asset-backed Securities |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 376,336 | 469,052
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 3,802
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (48,983) | (9,791)
Debt Securities, Available-for-sale | 327,353 | 463,063
State and Municipal Securities |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 959,469 | 983,704
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 199 | 18,525
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (125,595) | (4,938)
Debt Securities, Available-for-sale | 834,073 | 997,291
US Government Corporations and Agencies Securities [Member] |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 222,829 | 252,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 3,095
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (14,062) | (3,274)
Debt Securities, Available-for-sale | 208,769 | 252,576
US Government Securities |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 183,049 | 158,367
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (15,153) | (831)
Debt Securities, Available-for-sale | 167,896 | 157,536
Non-agency collateralized mortgage obligations |  |
Debt Securities [Line Items] |  |
Debt Securities Available-for-Sale, Amortized Cost | 352,782 | 295,547
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 340
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (61,484) | (955)
Debt Securities, Available-for-sale | $ 291,298 | $ 294,932

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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