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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Valuation allowance |  |  | $ 3,281
Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | $ 73,200 | 72,867
U.S. government agency securities |  | 92,327 | 79,692
Mortgage-backed securities |  | 1,618,580 | 1,463,907
State and municipal securities |  | 1,036,619 | 1,714,453
Agency-backed securities |  | 146,460 | 152,972
Corporate notes and other |  | 63,378 | 56,104
Total investment securities available-for-sale |  | 3,030,564 | 3,539,995
Other Investments |  | 65,194 | 63,291
Other assets |  | 262,156 | 134,040
Total assets at fair value |  | 3,357,914 | 3,737,326
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 202,366 | 87,613
Total liabilities at fair value |  | 202,366 | 87,613
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 |  | 73,200 | 72,867
U.S. government agency securities |  | 92,327 | 79,692
Mortgage-backed securities |  | 1,618,580 | 1,463,907
State and municipal securities |  | 1,021,852 | 1,698,550
Agency-backed securities |  | 146,460 | 152,972
Corporate notes and other |  | 63,378 | 56,104
Total investment securities available-for-sale |  | 3,015,797 | 3,524,092
Other Investments |  | 25,438 | 25,135
Other assets |  | 262,156 | 134,040
Total assets at fair value |  | 3,303,391 | 3,683,267
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 202,366 | 87,613
Total liabilities at fair value |  | 202,366 | 87,613
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 |  | 14,767 | 15,903
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 14,767 | 15,903
Other Investments |  | 39,756 | 38,156
Other assets |  | 0 | 0
Total assets at fair value |  | 54,523 | 54,059
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 |  | 62,436 | 61,964
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 27,182 | 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 35,254 | 32,477
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 |  | 62,436 | 61,964
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 27,182 | 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | $ 35,254 | $ 32,477
[1] | Amount is net of valuation allowance of $3.3 million at December 31, 2019 as required by ASC 310-10, "Receivables."

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