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Securities - Summary of Amortized Cost and Fair Values of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | $ 1,465,151 | $ 1,466,482
Available-for-sale Securities, Gross Unrealized Gains | 1,388 | 10,492
Available-for-sale Securities, Gross Unrealized Losses | (97,171) | (22,432)
Available-for-sale Securities, Fair Value | 1,369,368 | 1,454,542
U.S. Treasury Notes |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 24,875 | 18,447
Available-for-sale Securities, Gross Unrealized Gains | 4 | 37
Available-for-sale Securities, Gross Unrealized Losses | (654) | (8)
Available-for-sale Securities, Fair Value | 24,225 | 18,476
U.S. Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 149,164 | 141,096
Available-for-sale Securities, Gross Unrealized Gains | 328 | 661
Available-for-sale Securities, Gross Unrealized Losses | (9,252) | (2,367)
Available-for-sale Securities, Fair Value | 140,240 | 139,390
Obligations of States, Municipalities, and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 83,786 | 86,454
Available-for-sale Securities, Gross Unrealized Gains | 512 | 3,238
Available-for-sale Securities, Gross Unrealized Losses | (2,170) | (56)
Available-for-sale Securities, Fair Value | 82,128 | 89,636
Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 758,179 | 756,549
Available-for-sale Securities, Gross Unrealized Gains | 21 | 2,122
Available-for-sale Securities, Gross Unrealized Losses | (57,343) | (15,015)
Available-for-sale Securities, Fair Value | 700,857 | 743,656
Non-Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 140,350 | 146,499
Available-for-sale Securities, Gross Unrealized Gains | 0 | 4
Available-for-sale Securities, Gross Unrealized Losses | (9,926) | (1,267)
Available-for-sale Securities, Fair Value | 130,424 | 145,236
Agency, Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 206,203 | 214,417
Available-for-sale Securities, Gross Unrealized Gains | 25 | 2,795
Available-for-sale Securities, Gross Unrealized Losses | (16,535) | (3,661)
Available-for-sale Securities, Fair Value | 189,693 | 213,551
Corporate Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 65,798 | 65,814
Available-for-sale Securities, Gross Unrealized Gains | 488 | 1,586
Available-for-sale Securities, Gross Unrealized Losses | (1,144) | (54)
Available-for-sale Securities, Fair Value | 65,142 | 67,346
Asset-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost | 36,796 | 37,206
Available-for-sale Securities, Gross Unrealized Gains | 10 | 49
Available-for-sale Securities, Gross Unrealized Losses | (147) | (4)
Available-for-sale Securities, Fair Value | $ 36,659 | $ 37,251

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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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