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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Valuation allowance $ 5,529 $ 3,964
Recurring    
Assets, Fair Value Disclosure [Abstract]    
U.S. Treasury securities 48,917 30,300
U.S. government agency securities 55,023 70,159
Mortgage-backed securities 1,291,913 1,310,945
State and municipal securities 1,636,502 1,229,654
Agency-backed securities 169,423 375,582
Corporate notes and other 55,128 67,046
Total investment securities available-for-sale 3,256,906 3,083,686
Other Investments 56,573 50,791
Other assets 79,776 24,524
Total assets at fair value 3,393,255 3,159,001
Liabilities at fair value: [Abstract]    
Other liabilities 87,276 46,550
Total liabilities at fair value 87,276 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 48,917 30,300
U.S. government agency securities 55,023 70,159
Mortgage-backed securities 1,291,913 1,310,945
State and municipal securities 1,621,239 1,215,059
Agency-backed securities 169,423 375,582
Corporate notes and other 55,128 67,046
Total investment securities available-for-sale 3,241,643 3,069,091
Other Investments 25,050 24,369
Other assets 79,776 24,524
Total assets at fair value 3,346,469 3,117,984
Liabilities at fair value: [Abstract]    
Other liabilities 87,276 46,550
Total liabilities at fair value 87,276 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 15,263 14,595
Agency-backed securities 0 0
Corporate notes and other 0 0
Total investment securities available-for-sale 15,263 14,595
Other Investments 31,523 26,422
Other assets 0 0
Total assets at fair value 46,786 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 64,908 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 38,251 40,830
Other real estate owned 26,657 15,165
Gain (Loss) on Other real estate owned (2,438) (84)
Total losses on impaired loans, net (5,228) [1] (1,214)
Gain Loss On assets (7,666) (1,298)
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 64,908 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 38,251 40,830
Other real estate owned $ 26,657 $ 15,165
[1] Amount is net of valuation allowance of $5.5 million and $4.0 million at June 30, 2019 and December 31, 2018, respectively, as required by ASC 310-10, "Receivables."