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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Valuation allowance |  |  | $ 3,280
Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. Treasury securities |  | $ 72,612 | 72,867
U.S. government agency securities |  | 76,311 | 79,692
Mortgage-backed securities |  | 1,738,446 | 1,463,907
State and municipal securities |  | 1,179,729 | 1,714,453
Agency-backed securities |  | 140,415 | 152,972
Corporate notes and other |  | 102,765 | 56,104
Total investment securities available-for-sale |  | 3,310,278 | 3,539,995
Other Investments |  | 66,276 | 63,291
Other assets |  | 280,593 | 134,040
Total assets at fair value |  | 3,657,147 | 3,737,326
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 212,810 | 87,613
Total liabilities at fair value |  | 212,810 | 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 |  | 72,612 | 72,867
U.S. government agency securities |  | 76,311 | 79,692
Mortgage-backed securities |  | 1,738,446 | 1,463,907
State and municipal securities |  | 1,164,434 | 1,698,550
Agency-backed securities |  | 140,415 | 152,972
Corporate notes and other |  | 102,765 | 56,104
Total investment securities available-for-sale |  | 3,294,983 | 3,524,092
Other Investments |  | 25,664 | 25,135
Other assets |  | 280,593 | 134,040
Total assets at fair value |  | 3,601,240 | 3,683,267
Liabilities at fair value: [Abstract] |  |  |
Other liabilities |  | 212,810 | 87,613
Total liabilities at fair value |  | 212,810 | 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 |  | 15,295 | 15,903
Agency-backed securities |  | 0 | 0
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 15,295 | 15,903
Other Investments |  | 40,612 | 38,156
Other assets |  | 0 | 0
Total assets at fair value |  | 55,907 | 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 |  | 58,488 | 61,965
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 22,080 | 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 36,408 | 32,478
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 |  | 58,488 | 61,965
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |
Other real estate owned |  | 22,080 | 29,487
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | $ 36,408 | $ 32,478
[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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