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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | $ 144,157 | $ 82,209
U.S. government agency securities |  | 422,055 | 76,403
Mortgage-backed securities |  | 1,967,981 | 1,689,191
State and municipal securities |  | 1,759,648 | 1,443,363
Agency-backed securities |  | 220,197 | 177,936
Corporate notes and other |  | 120,615 | 117,579
Total investment securities available-for-sale |  | 4,634,653 | 3,586,681
Other Investments |  | 119,647 | 73,395
Other assets |  | 73,230 | 242,470
Total assets at fair value |  | 4,827,530 | 3,902,546
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 105,953 | 177,025
Total liabilities at fair value |  | 105,953 | 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 |  | 144,157 | 82,209
U.S. government agency securities |  | 422,055 | 76,403
Mortgage-backed securities |  | 1,967,981 | 1,689,191
State and municipal securities |  | 1,758,776 | 1,427,866
Agency-backed securities |  | 220,197 | 177,936
Corporate notes and other |  | 120,615 | 117,579
Total investment securities available-for-sale |  | 4,633,781 | 3,571,184
Other Investments |  | 25,206 | 25,636
Other assets |  | 73,230 | 242,470
Total assets at fair value |  | 4,732,217 | 3,839,290
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 105,953 | 177,025
Total liabilities at fair value |  | 105,953 | 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 |  | 872 | 15,497
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 872 | 15,497
Other Investments |  | 94,441 | 47,759
Other assets |  | 0 | 0
Total assets at fair value |  | 95,313 | 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 |  | 48,384 | 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 8,415 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 39,969 | 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 |  | 48,384 | 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 8,415 | 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | $ 39,969 | $ 43,795
[1] | The carrying values of collateral dependent loans at September 30, 2021 and December 31, 2020 are net of valuation allowances of $1.9 million and $3.5 million, respectively

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