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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Valuation allowance $ 3,608 $ 3,964
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities 48,662 30,300
U.S. government agency securities 92,246 70,159
Mortgage-backed securities 1,334,517 1,310,945
State and municipal securities 1,699,886 1,229,654
Agency-backed securities 162,733 375,582
Corporate notes and other 55,391 67,046
Total investment securities available-for-sale 3,393,435 3,083,686
Other Investments 59,195 50,791
Other assets 96,814 24,524
Total assets at fair value 3,549,444 3,159,001
Liabilities at fair value: [Abstract]    
Other liabilities 113,070 46,550
Total liabilities at fair value 113,070 46,550
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 48,662 30,300
U.S. government agency securities 92,246 70,159
Mortgage-backed securities 1,334,517 1,310,945
State and municipal securities 1,684,020 1,215,059
Agency-backed securities 162,733 375,582
Corporate notes and other 55,391 67,046
Total investment securities available-for-sale 3,377,569 3,069,091
Other Investments 25,247 24,369
Other assets 96,814 24,524
Total assets at fair value 3,499,630 3,117,984
Liabilities at fair value: [Abstract]    
Other liabilities 113,070 46,550
Total liabilities at fair value 113,070 46,550
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 15,866 14,595
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 15,866 14,595
Other Investments 33,948 26,422
Other assets 0 0
Total assets at fair value 49,814 41,017
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 71,190 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 41,141 40,830
Other real estate owned 30,049 15,165
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]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0
Other real estate owned 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]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0
Other real estate owned 0 0
Nonrecurring | Models with significant unobservable market parameters (Level 3)    
Assets, Fair Value Disclosure [Abstract]    
Total assets at fair value 71,190 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 41,141 40,830
Other real estate owned $ 30,049 $ 15,165
[1] Amount is net of valuation allowance of $3.6 million and $4.0 million at September 30, 2019 and December 31, 2018, respectively, as required by ASC 310-10, "Receivables."