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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,072,498 | $ 1,599,894
Gross Unrealized Gains | 18,021 | 30,773
Gross Unrealized Losses | 23,592 | 3,474
Fair Value | 2,066,927 | 1,627,193
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 140,373 |
Gross Unrealized Gains | 2 |
Gross Unrealized Losses | 1,447 |
Fair Value | 138,928 |
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 813,833 | 599,652
Gross Unrealized Gains | 6,001 | 9,820
Gross Unrealized Losses | 9,491 | 1,992
Fair Value | 810,343 | 607,480
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 107,912 | 126,642
Gross Unrealized Gains | 2,144 | 3,144
Gross Unrealized Losses | 145 | 40
Fair Value | 109,911 | 129,746
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 88,135 | 179,538
Gross Unrealized Gains | 1,607 | 3,216
Gross Unrealized Losses | 422 | 646
Fair Value | 89,320 | 182,108
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 919,745 | 691,562
Gross Unrealized Gains | 8,267 | 14,593
Gross Unrealized Losses | 12,008 | 675
Fair Value | 916,004 | 705,480
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 | 79 | 121
Fair Value | $ 2,421 | $ 2,379

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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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