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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  | $ 1,255,438 | $ 311,552
More than 12 Months, fair value |  | 8,281 | 17,450
Total fair value |  | 1,263,719 | 329,002
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  | 64,209 | 3,891
More than 12 Months, unrealized Loss |  | 1,137 | 1,059
Total unrealized loss |  | 65,346 | 4,950
Securities available for sale, at estimated fair value |  | 2,065,984 | 2,764,325
Securities available for sale, amortized cost |  | 2,117,597 | 2,655,594
Gross unrealized gains |  | 13,733 | 113,681
Gross unrealized losses |  | 65,346 | 4,950
US Treasury Securities |  |  |
Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  |  | 9,947
More than 12 Months, fair value |  |  | 0
Total fair value |  |  | 9,947
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  |  | 50
More than 12 Months, unrealized Loss |  |  | 0
Total unrealized loss |  |  | 50
Securities available for sale, at estimated fair value |  |  | 58,877
Securities available for sale, amortized cost |  |  | 58,084
Gross unrealized gains |  |  | 843
Gross unrealized losses |  |  | 50
State and political subdivisions |  |  |
Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  | 1,030,604 | 260,509
More than 12 Months, fair value |  | 0 | 7,608
Total fair value |  | 1,030,604 | 268,117
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 12,767 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 240,844 |
More than 12 months, unrealized loss |  | 191 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 17,255 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 12,576 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 223,589 |
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  | 58,873 | 3,622
More than 12 Months, unrealized Loss |  | 0 | 592
Total unrealized loss |  | 58,873 | 4,214
Securities available for sale, at estimated fair value |  | 1,566,185 | 2,051,936
Securities available for sale, amortized cost |  | 1,614,421 | 1,962,257
Gross unrealized gains |  | 10,637 | 93,893
Gross unrealized losses |  | 58,873 | 4,214
Corporate bonds and other |  |  |
Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  | 108,153 | 35,597
More than 12 Months, fair value |  | 0 | 0
Total fair value |  | 108,153 | 35,597
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  | 3,191 | 209
More than 12 Months, unrealized Loss |  | 0 | 0
Total unrealized loss |  | 3,191 | 209
Securities available for sale, at estimated fair value |  | 141,326 | 135,532
Securities available for sale, amortized cost |  | 144,264 | 133,333
Gross unrealized gains |  | 253 | 2,408
Gross unrealized losses |  | 3,191 | 209
Residential |  |  |
Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  | 106,742 | 1,225
More than 12 Months, fair value |  | 4,572 | 5,168
Total fair value |  | 111,314 | 6,393
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 64 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 3,617 |
More than 12 months, unrealized loss |  | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 64 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 3,617 |
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  | 2,113 | 3
More than 12 Months, unrealized Loss |  | 581 | 269
Total unrealized loss |  | 2,694 | 272
Securities available for sale, at estimated fair value | [1] | 280,691 | 426,350
Securities available for sale, amortized cost | [1] | 280,804 | 411,727
Gross unrealized gains | [1] | 2,581 | 14,895
Gross unrealized losses | [1] | 2,694 | 272
Commercial |  |  |
Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Less than 12 Months, fair value |  | 9,939 | 4,274
More than 12 Months, fair value |  | 3,709 | 4,674
Total fair value |  | 13,648 | 8,948
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 260 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 22,857 |
More than 12 months, unrealized loss |  | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 260 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 22,857 |
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |
Less than 12 Months, unrealized loss |  | 32 | 7
More than 12 Months, unrealized Loss |  | 556 | 198
Total unrealized loss |  | 588 | 205
Securities available for sale, at estimated fair value | [1] | 77,782 | 91,630
Securities available for sale, amortized cost | [1] | 78,108 | 90,193
Gross unrealized gains | [1] | 262 | 1,642
Gross unrealized losses | [1] | $ 588 | $ 205
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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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 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: 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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