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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Valuation allowance		$ 2,700	$ 3,500
Recurring
Assets, Fair Value Disclosure [Abstract]
U.S. Treasury securities		83,993	82,209
U.S. government agency securities		157,456	76,403
Mortgage-backed securities		1,609,778	1,689,191
State and municipal securities		1,512,360	1,443,363
Agency-backed securities		190,695	177,936
Corporate notes and other		122,737	117,579
Total investment securities available-for-sale		3,677,019	3,586,681
Other Investments		87,347	73,395
Other assets		190,753	242,470
Total assets at fair value		3,955,119	3,902,546
Liabilities at fair value: [Abstract]
Other liabilities		116,646	177,025
Total liabilities at fair value		116,646	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		83,993	82,209
U.S. government agency securities		157,456	76,403
Mortgage-backed securities		1,609,778	1,689,191
State and municipal securities		1,498,847	1,427,866
Agency-backed securities		190,695	177,936
Corporate notes and other		122,737	117,579
Total investment securities available-for-sale		3,663,506	3,571,184
Other Investments		25,218	25,636
Other assets		190,753	242,470
Total assets at fair value		3,879,477	3,839,290
Liabilities at fair value: [Abstract]
Other liabilities		116,646	177,025
Total liabilities at fair value		116,646	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		13,513	15,497
Agency-backed securities		0	0
Corporate notes and other		0	0
Total investment securities available-for-sale		13,513	15,497
Other Investments		62,129	47,759
Other assets		0	0
Total assets at fair value		75,642	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		51,541	56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		10,651	12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	40,890	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		51,541	56,155
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		10,651	12,360
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	$ 40,890	$ 43,795
[1] The carrying values of collateral dependent loans at March 31, 2021 and December 31, 2020 are net of valuation allowances of $2.7 million and $3.5 million, respectively

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Amount of allowance for credit losses related to recorded investment.

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