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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Securities available-for-sale [Abstract]
Amortized Cost	$ 3,688,195	$ 4,858,544
Gross Unrealized Gains	22,475	88,336
Gross Unrealized Losses	140,947	32,686
Fair Value	3,569,723	4,914,194
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	83,308
Due in one year to five years	161,633
Due in five years to ten years	392,289
Due after ten years	1,262,669
Mortgage-backed securities	1,611,929
Asset-backed securities	176,367
Amortized Cost	3,688,195	4,858,544
Available-for-sale, Fair Value [Abstract]
Due in one year or less	83,147
Due in one year to five years	164,323
Due in five years to ten years	386,656
Due after ten years	1,238,654
Mortgage-backed securities	1,530,564
Asset-backed securities	166,379
Fair Value	3,569,723	4,914,194
Securities held-to-maturity [Abstract]
Amortized Cost	2,567,492	1,156,119
Gross Unrealized Gains	5,803	33,052
Gross Unrealized Losses	140,641	1,122
Fair Value	2,432,654	1,188,049
Allowance for credit losses - securities held-to-maturity	(1,106)	(161)
HeldToMaturitySecurities, net of allowance for credit losses	2,566,386	1,155,958
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	1,971
Due in one year to five years	277,233
Due in five years to ten years	33,474
Due after ten years	1,730,046
Mortgage-backed securities	374,692
Asset-backed securities	150,076
Amortized Cost	2,567,492	1,156,119
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	1,969
Due in one year to five years	264,682
Due in five years to ten years	31,634
Due after ten years	1,638,035
Mortgage-backed securities	353,880
Asset-backed securities	142,454
Fair Value	2,432,654	1,188,049
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	81,314	194,490
Gross Unrealized Gains	0	0
Gross Unrealized Losses	150	881
Fair Value	81,164	193,609
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	81,314	194,490
Available-for-sale, Fair Value [Abstract]
Fair Value	81,164	193,609
Securities held-to-maturity [Abstract]
Amortized Cost	93,039
Gross Unrealized Gains	0
Gross Unrealized Losses	3,778
Fair Value	89,261
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	93,039
Held-to-maturity, Fair Value [Abstract]
Fair Value	89,261
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	444,161	634,611
Gross Unrealized Gains	2,018	2,359
Gross Unrealized Losses	16,231	4,961
Fair Value	429,948	632,009
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	444,161	634,611
Available-for-sale, Fair Value [Abstract]
Fair Value	429,948	632,009
Securities held-to-maturity [Abstract]
Amortized Cost	213,854	11,920
Gross Unrealized Gains	0	0
Gross Unrealized Losses	10,753	37
Fair Value	203,101	11,883
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	213,854	11,920
Held-to-maturity, Fair Value [Abstract]
Fair Value	203,101	11,883
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	1,611,929	1,908,675
Gross Unrealized Gains	2,574	29,874
Gross Unrealized Losses	83,939	18,310
Fair Value	1,530,564	1,920,239
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,611,929	1,908,675
Available-for-sale, Fair Value [Abstract]
Fair Value	1,530,564	1,920,239
Securities held-to-maturity [Abstract]
Amortized Cost	374,692	106,555
Gross Unrealized Gains	121	86
Gross Unrealized Losses	20,933	196
Fair Value	353,880	106,445
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	374,692	106,555
Held-to-maturity, Fair Value [Abstract]
Fair Value	353,880	106,445
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,257,130	1,774,119
Gross Unrealized Gains	16,644	52,961
Gross Unrealized Losses	26,609	3,243
Fair Value	1,247,165	1,823,837
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,257,130	1,774,119
Available-for-sale, Fair Value [Abstract]
Fair Value	1,247,165	1,823,837
Securities held-to-maturity [Abstract]
Amortized Cost	1,726,629	1,037,644
Gross Unrealized Gains	5,682	32,966
Gross Unrealized Losses	97,222	889
Fair Value	1,635,089	1,069,721
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,726,629	1,037,644
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,635,089	1,069,721
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	176,367	232,294
Gross Unrealized Gains	0	60
Gross Unrealized Losses	9,988	2,785
Fair Value	166,379	229,569
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	176,367	232,294
Available-for-sale, Fair Value [Abstract]
Fair Value	166,379	229,569
Securities held-to-maturity [Abstract]
Amortized Cost	150,076
Gross Unrealized Gains	0
Gross Unrealized Losses	7,622
Fair Value	142,454
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	150,076
Held-to-maturity, Fair Value [Abstract]
Fair Value	142,454
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	117,294	114,355
Gross Unrealized Gains	1,239	3,082
Gross Unrealized Losses	4,030	2,506
Fair Value	114,503	114,931
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	117,294	114,355
Available-for-sale, Fair Value [Abstract]
Fair Value	114,503	$ 114,931
Securities held-to-maturity [Abstract]
Amortized Cost	9,202
Gross Unrealized Gains	0
Gross Unrealized Losses	333
Fair Value	8,869
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	9,202
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 8,869

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