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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract] |  |  |
Other Investments |  | $ 101,000 | $ 47,800
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Valuation allowance of impaired loans |  | 1,700 | 3,500
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Transfers out of Level 3 |  | 0 |
Other Liabilities |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 0 | 0
Total realized gains included in income |  | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 | 0
Purchases |  | 0 | 0
Issuances |  | 0 | 0
Settlements |  | 0 | 0
Transfers out of Level 3 |  | 0 | 0
Fair value, December 31 |  | 0 | 0
Other Assets |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 47,759 | 38,156
Total realized gains included in income |  | 23,109 | 1,067
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 | 0
Purchases |  | 45,986 | 11,663
Issuances |  | 0 | 0
Settlements |  | (15,858) | (3,127)
Transfers out of Level 3 |  | 0 | 0
Fair value, December 31 |  | 100,996 | 47,759
Available-for-sale Securities |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 15,497 | 15,903
Total realized gains included in income |  | 1,302 | 110
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (3,184) | 627
Purchases |  | 0 | 0
Issuances |  | 0 | 0
Settlements |  | (12,787) | (1,143)
Transfers out of Level 3 |  | 0 | 0
Fair value, December 31 |  | 828 | 15,497
Fair Value, Measurements, Nonrecurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 39,336 | 56,155
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 8,537 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 30,799 | 43,795
Fair Value, Measurements, Nonrecurring | Quoted Market Prices in an Active Market (Level 1) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 0 | 0
Fair Value, Measurements, Nonrecurring | Models with Significant Observable Market Parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 0 | 0
Fair Value, Measurements, Nonrecurring | Models with Significant Unobservable Market Parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 39,336 | 56,155
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 8,537 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 30,799 | 43,795
Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 193,609 | 82,209
U.S. government agency securities |  | 632,009 | 76,403
Mortgage-backed securities |  | 1,920,239 | 1,689,191
State and municipal securities |  | 1,823,837 | 1,443,363
Asset-backed securities |  | 229,569 | 177,936
Corporate notes and other, Fair Value Disclosure |  | 114,931 | 117,579
Total investment securities available-for-sale |  | 4,914,194 | 3,586,681
Other Investments |  | 125,969 | 73,395
Other assets |  | 57,441 | 242,470
Total assets at fair value |  | 5,097,604 | 3,902,546
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 80,106 | 177,025
Total liabilities at fair value |  | 80,106 | 177,025
Fair Value, Measurements, Recurring | Quoted Market Prices in an Active Market (Level 1) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 0 | 0
U.S. government agency securities |  | 0 | 0
Mortgage-backed securities |  | 0 | 0
State and municipal securities |  | 0 | 0
Asset-backed securities |  | 0 | 0
Corporate notes and other, Fair Value Disclosure |  | 0 | 0
Total investment securities available-for-sale |  | 0 | 0
Other Investments |  | 0 | 0
Other assets |  | 0 | 0
Total assets at fair value |  | 0 | 0
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 0 | 0
Total liabilities at fair value |  | 0 | 0
Fair Value, Measurements, Recurring | Models with Significant Observable Market Parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 193,609 | 82,209
U.S. government agency securities |  | 632,009 | 76,403
Mortgage-backed securities |  | 1,920,239 | 1,689,191
State and municipal securities |  | 1,823,009 | 1,427,866
Asset-backed securities |  | 229,569 | 177,936
Corporate notes and other, Fair Value Disclosure |  | 114,931 | 117,579
Total investment securities available-for-sale |  | 4,913,366 | 3,571,184
Other Investments |  | 24,973 | 25,636
Other assets |  | 57,441 | 242,470
Total assets at fair value |  | 4,995,780 | 3,839,290
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 80,106 | 177,025
Total liabilities at fair value |  | 80,106 | 177,025
Fair Value, Measurements, Recurring | Models with Significant Unobservable Market Parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 0 | 0
U.S. government agency securities |  | 0 | 0
Mortgage-backed securities |  | 0 | 0
State and municipal securities |  | 828 | 15,497
Asset-backed securities |  | 0 | 0
Corporate notes and other, Fair Value Disclosure |  | 0 | 0
Total investment securities available-for-sale |  | 828 | 15,497
Other Investments |  | 100,996 | 47,759
Other assets |  | 0 | 0
Total assets at fair value |  | 101,824 | 63,256
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 0 | 0
Total liabilities at fair value |  | $ 0 | $ 0
[1] | The carrying values of collateral dependent loans at December 31, 2021 and 2020 are net of valuation allowances of $1.7 million and $3.5 million, respectively.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents US government treasury and federal agency issued securities. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents US government treasury securities. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=122636397&loc=SL7495116-110257 + Details
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