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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | $ 208,613 | $ 194,184
U.S. Government agency securities |  | 282,054 | 396,157
Mortgage-backed securities |  | 949,374 | 971,576
State and municipal securities |  | 1,546,640 | 1,412,306
Agency-backed securities |  | 161,861 | 117,403
Corporate notes and other |  | 442,738 | 467,244
Total investment securities available-for-sale |  | 3,591,280 | 3,558,870
Other Investments |  | 173,781 | 153,011
Other assets |  | 227,850 | 190,629
Total assets at fair value |  | 3,992,911 | 3,902,510
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 110,242 | 96,483
Total liabilities at fair value |  | 110,242 | 96,483
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
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 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
Recurring | Models with significant observable market parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | 208,613 | 194,184
U.S. Government agency securities |  | 282,054 | 396,157
Mortgage-backed securities |  | 949,374 | 971,576
State and municipal securities |  | 1,546,161 | 1,411,677
Agency-backed securities |  | 161,861 | 117,403
Corporate notes and other |  | 442,738 | 467,244
Total investment securities available-for-sale |  | 3,590,801 | 3,558,241
Other Investments |  | 22,019 | 22,029
Other assets |  | 227,850 | 190,629
Total assets at fair value |  | 3,840,670 | 3,770,899
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 110,242 | 96,483
Total liabilities at fair value |  | 110,242 | 96,483
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 |  | 479 | 629
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 479 | 629
Other Investments |  | 151,762 | 130,982
Other assets |  | 0 | 0
Total assets at fair value |  | 152,241 | 131,611
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 0 | 0
Total liabilities at fair value |  | 0 | 0
Nonrecurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 42,796 | 41,719
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 2,555 | 7,952
Collateral dependent loans (1) | [1] | 40,241 | 33,767
Nonrecurring | Quoted market prices in an active market (Level 1) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Collateral dependent loans (1) | [1] | 0 | 0
Nonrecurring | Models with significant observable market parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Collateral dependent loans (1) | [1] | 0 | 0
Nonrecurring | Models with significant unobservable market parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 42,796 | 41,719
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 2,555 | 7,952
Collateral dependent loans (1) | [1] | $ 40,241 | $ 33,767
[1] | The carrying values of collateral dependent loans at June 30, 2023 and December 31, 2022 are net of valuation allowances of $6.2 million and $6.5 million, respectively.

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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A + Details
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