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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Held-to-Maturity
Amortized Cost	$ 611,118	$ 335,946
Allowance for credit losses on HTM	(1,618)	(2,915)	$ (409)	$ 0
Net Carrying Amount	609,500	333,031
Gross Unrealized Gains	2,238	8,924
Gross Unrealized (Losses)	(14,044)	(30)
Estimated Fair Value	597,694	341,925
Available-for-sale
Amortized Cost	4,582,052	3,397,043
Allowance for credit losses on AFS	(2,454)	(312)	(269)	0
Gross Unrealized Gains	42,545	79,663
Gross Unrealized (Losses)	(93,795)	(2,796)
Estimated Fair Value	4,528,348	3,473,598
U.S. Treasury
Available-for-sale
Amortized Cost	600
Allowance for credit losses on AFS	0
Gross Unrealized Gains	0
Gross Unrealized (Losses)	0
Estimated Fair Value	600
U.S. Government agencies
Held-to-Maturity
Amortized Cost	77,396
Allowance for credit losses on HTM	0
Net Carrying Amount	77,396
Gross Unrealized Gains	0
Gross Unrealized (Losses)	(3,757)
Estimated Fair Value	73,639
Available-for-sale
Amortized Cost	511,973	477,693
Allowance for credit losses on AFS	0	0
Gross Unrealized Gains	369	844
Gross Unrealized (Losses)	(24,663)	(1,300)
Estimated Fair Value	487,679	477,237
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	47,988	22,354
Allowance for credit losses on HTM	0	0
Net Carrying Amount	47,988	22,354
Gross Unrealized Gains	476	683
Gross Unrealized (Losses)	(1,099)	0
Estimated Fair Value	47,365	23,037
Available-for-sale
Amortized Cost	2,156,121	1,374,769
Allowance for credit losses on AFS	0	0
Gross Unrealized Gains	12,917	21,261
Gross Unrealized (Losses)	(35,952)	(1,094)
Estimated Fair Value	2,133,086	1,394,936
State and political subdivisions
Held-to-Maturity
Amortized Cost	485,158	312,416
Allowance for credit losses on HTM	(1,042)	(2,307)	(97)	0
Net Carrying Amount	484,116	310,109
Gross Unrealized Gains	1,718	8,148
Gross Unrealized (Losses)	(9,188)	(30)
Estimated Fair Value	476,646	318,227
Available-for-sale
Amortized Cost	1,570,747	1,416,136
Allowance for credit losses on AFS	(64)	(217)	(95)	0
Gross Unrealized Gains	25,916	55,111
Gross Unrealized (Losses)	(24,689)	(307)
Estimated Fair Value	1,571,910	1,470,723
Other securities
Held-to-Maturity
Amortized Cost	576	1,176
Allowance for credit losses on HTM	(576)	(608)	(312)	0
Net Carrying Amount	0	568
Gross Unrealized Gains	44	93
Gross Unrealized (Losses)	0	0
Estimated Fair Value	44	661
Available-for-sale
Amortized Cost	342,611	128,445
Allowance for credit losses on AFS	(2,390)	(95)	$ (174)	$ 0
Gross Unrealized Gains	3,343	2,447
Gross Unrealized (Losses)	(8,491)	(95)
Estimated Fair Value	$ 335,073	$ 130,702

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