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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities $ 111,469 $ 82,209
U.S. government agency securities 422,856 76,403
Mortgage-backed securities 1,899,248 1,689,191
State and municipal securities 1,580,713 1,443,363
Agency-backed securities 200,088 177,936
Corporate notes and other 116,696 117,579
Total investment securities available-for-sale 4,331,070 3,586,681
Other Investments 104,039 73,395
Other assets 82,527 242,470
Total assets at fair value 4,517,636 3,902,546
Liabilities at fair value: [Abstract]    
Other liabilities 119,043 177,025
Total liabilities at fair value 119,043 177,025
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 111,469 82,209
U.S. government agency securities 422,856 76,403
Mortgage-backed securities 1,899,248 1,689,191
State and municipal securities 1,579,873 1,427,866
Agency-backed securities 200,088 177,936
Corporate notes and other 116,696 117,579
Total investment securities available-for-sale 4,330,230 3,571,184
Other Investments 25,284 25,636
Other assets 82,527 242,470
Total assets at fair value 4,438,041 3,839,290
Liabilities at fair value: [Abstract]    
Other liabilities 119,043 177,025
Total liabilities at fair value 119,043 177,025
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 840 15,497
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 840 15,497
Other Investments 78,755 47,759
Other assets 0 0
Total assets at fair value 79,595 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 49,341 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 9,602 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 39,739 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 49,341 56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Other real estate owned 9,602 12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] $ 39,739 $ 43,795
[1] The carrying values of collateral dependent loans at June 30, 2021 and December 31, 2020 are net of valuation allowances of $2.2 million and $3.5 million, respectively