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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Valuation allowance |  | $ 2,700 | $ 3,500
Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | 83,993 | 82,209
U.S. government agency securities |  | 157,456 | 76,403
Mortgage-backed securities |  | 1,609,778 | 1,689,191
State and municipal securities |  | 1,512,360 | 1,443,363
Agency-backed securities |  | 190,695 | 177,936
Corporate notes and other |  | 122,737 | 117,579
Total investment securities available-for-sale |  | 3,677,019 | 3,586,681
Other Investments |  | 87,347 | 73,395
Other assets |  | 190,753 | 242,470
Total assets at fair value |  | 3,955,119 | 3,902,546
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 116,646 | 177,025
Total liabilities at fair value |  | 116,646 | 177,025
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 |  | 83,993 | 82,209
U.S. government agency securities |  | 157,456 | 76,403
Mortgage-backed securities |  | 1,609,778 | 1,689,191
State and municipal securities |  | 1,498,847 | 1,427,866
Agency-backed securities |  | 190,695 | 177,936
Corporate notes and other |  | 122,737 | 117,579
Total investment securities available-for-sale |  | 3,663,506 | 3,571,184
Other Investments |  | 25,218 | 25,636
Other assets |  | 190,753 | 242,470
Total assets at fair value |  | 3,879,477 | 3,839,290
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 116,646 | 177,025
Total liabilities at fair value |  | 116,646 | 177,025
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 |  | 13,513 | 15,497
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 13,513 | 15,497
Other Investments |  | 62,129 | 47,759
Other assets |  | 0 | 0
Total assets at fair value |  | 75,642 | 63,256
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 |  | 51,541 | 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 10,651 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 40,890 | 43,795
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
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [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
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 0 | 0
Nonrecurring | Models with significant unobservable market parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 51,541 | 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 10,651 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | $ 40,890 | $ 43,795
[1] | The carrying values of collateral dependent loans at March 31, 2021 and December 31, 2020 are net of valuation allowances of $2.7 million and $3.5 million, respectively

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