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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,106,906 | $ 2,063,790
Gross Unrealized Gains | 1,290 | 13,626
Gross Unrealized Losses | 127,048 | 32,903
Fair Value | 1,981,148 | 2,044,513
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,997 | 160,291
Gross Unrealized Gains | 0 | 85
Gross Unrealized Losses | 12,094 | 2,542
Fair Value | 178,903 | 157,834
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 852,733 | 843,218
Gross Unrealized Gains | 898 | 4,527
Gross Unrealized Losses | 51,524 | 15,372
Fair Value | 802,107 | 832,373
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 100,287 | 102,177
Gross Unrealized Gains | 152 | 2,092
Gross Unrealized Losses | 4,778 | 100
Fair Value | 95,661 | 104,169
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68,435 | 76,502
Gross Unrealized Gains | 157 | 1,187
Gross Unrealized Losses | 2,315 | 532
Fair Value | 66,277 | 77,157
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 891,954 | 879,102
Gross Unrealized Gains | 83 | 5,735
Gross Unrealized Losses | 56,264 | 14,281
Fair Value | 835,773 | 870,556
U.S. corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,500 | 2,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 73 | 76
Fair Value | $ 2,427 | $ 2,424

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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