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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Held-to-maturity
Amortized Cost	$ 1,530,500	$ 335,946
Allowance for Credit Losses	(1,279)	(2,915)	$ 0
Net Carrying Amount	1,529,221	333,031
Gross Unrealized Gains	6,398	8,924
Gross Unrealized (Losses)	(18,241)	(30)
Estimated Fair Value	1,517,378	341,925
Available-for-sale
Available-for-sale, amortized cost	7,130,861	3,397,043
Allowance for Credit Losses	0	(312)	0
Gross Unrealized Gains	44,005	79,663
Gross Unrealized (Losses)	(61,321)	(2,796)
Estimated Fair Value	7,113,545	3,473,598
U.S. Treasury
Available-for-sale
Available-for-sale, amortized cost	300
Allowance for Credit Losses	0
Gross Unrealized Gains	0
Gross Unrealized (Losses)	0
Estimated Fair Value	300
U.S. Government agencies
Held-to-maturity
Amortized Cost	232,609
Allowance for Credit Losses	0
Net Carrying Amount	232,609
Gross Unrealized Gains	0
Gross Unrealized (Losses)	(7,914)
Estimated Fair Value	224,695
Available-for-sale
Available-for-sale, amortized cost	374,754	477,693
Allowance for Credit Losses	0	0
Gross Unrealized Gains	495	844
Gross Unrealized (Losses)	(10,608)	(1,300)
Estimated Fair Value	364,641	477,237
Mortgage-backed securities
Held-to-maturity
Amortized Cost	70,342	22,354
Allowance for Credit Losses	0	0
Net Carrying Amount	70,342	22,354
Gross Unrealized Gains	232	683
Gross Unrealized (Losses)	(1,425)	0
Estimated Fair Value	69,149	23,037
Available-for-sale
Available-for-sale, amortized cost	4,485,548	1,374,769
Allowance for Credit Losses	0	0
Gross Unrealized Gains	6,307	21,261
Gross Unrealized (Losses)	(43,239)	(1,094)
Estimated Fair Value	4,448,616	1,394,936
State and political subdivisions
Held-to-maturity
Amortized Cost	1,210,248	312,416
Allowance for Credit Losses	(1,197)	(2,307)	0
Net Carrying Amount	1,209,051	310,109
Gross Unrealized Gains	6,166	8,148
Gross Unrealized (Losses)	(8,462)	(30)
Estimated Fair Value	1,206,755	318,227
Available-for-sale
Available-for-sale, amortized cost	1,791,097	1,416,136
Allowance for Credit Losses	0	(217)	0
Gross Unrealized Gains	30,556	55,111
Gross Unrealized (Losses)	(1,995)	(307)
Estimated Fair Value	1,819,658	1,470,723
Other securities
Held-to-maturity
Amortized Cost	17,301	1,176
Allowance for Credit Losses	(82)	(608)	0
Net Carrying Amount	17,219	568
Gross Unrealized Gains	0	93
Gross Unrealized (Losses)	(440)	0
Estimated Fair Value	16,779	661
Available-for-sale
Available-for-sale, amortized cost	479,162	128,445
Allowance for Credit Losses	0	(95)	$ 0
Gross Unrealized Gains	6,647	2,447
Gross Unrealized (Losses)	(5,479)	(95)
Estimated Fair Value	$ 480,330	$ 130,702

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