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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
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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